diff --git a/src/Magnum/Trade/AbstractImporter.cpp b/src/Magnum/Trade/AbstractImporter.cpp
index 7cfc32bb5..f6573ab51 100644
--- a/src/Magnum/Trade/AbstractImporter.cpp
+++ b/src/Magnum/Trade/AbstractImporter.cpp
@@ -222,7 +222,10 @@ void AbstractImporter::close() {
 
 Int AbstractImporter::defaultScene() const {
     CORRADE_ASSERT(isOpened(), "Trade::AbstractImporter::defaultScene(): no file opened", -1);
-    return doDefaultScene();
+    const Int id = doDefaultScene();
+    CORRADE_ASSERT(id == -1 || UnsignedInt(id) < doSceneCount(),
+        "Trade::AbstractImporter::defaultScene(): implementation-returned index" << id << "out of range for" << doSceneCount() << "entries", {});
+    return id;
 }
 
 Int AbstractImporter::doDefaultScene() const { return -1; }
@@ -236,7 +239,10 @@ UnsignedInt AbstractImporter::doSceneCount() const { return 0; }
 
 Int AbstractImporter::sceneForName(const std::string& name) {
     CORRADE_ASSERT(isOpened(), "Trade::AbstractImporter::sceneForName(): no file opened", -1);
-    return doSceneForName(name);
+    const Int id = doSceneForName(name);
+    CORRADE_ASSERT(id == -1 || UnsignedInt(id) < doSceneCount(),
+        "Trade::AbstractImporter::sceneForName(): implementation-returned index" << id << "out of range for" << doSceneCount() << "entries", {});
+    return id;
 }
 
 Int AbstractImporter::doSceneForName(const std::string&) { return -1; }
@@ -278,7 +284,10 @@ UnsignedInt AbstractImporter::doAnimationCount() const { return 0; }
 
 Int AbstractImporter::animationForName(const std::string& name) {
     CORRADE_ASSERT(isOpened(), "Trade::AbstractImporter::animationForName(): no file opened", {});
-    return doAnimationForName(name);
+    const Int id = doAnimationForName(name);
+    CORRADE_ASSERT(id == -1 || UnsignedInt(id) < doAnimationCount(),
+        "Trade::AbstractImporter::animationForName(): implementation-returned index" << id << "out of range for" << doAnimationCount() << "entries", {});
+    return id;
 }
 
 Int AbstractImporter::doAnimationForName(const std::string&) { return -1; }
@@ -325,7 +334,10 @@ UnsignedInt AbstractImporter::doLightCount() const { return 0; }
 
 Int AbstractImporter::lightForName(const std::string& name) {
     CORRADE_ASSERT(isOpened(), "Trade::AbstractImporter::lightForName(): no file opened", {});
-    return doLightForName(name);
+    const Int id = doLightForName(name);
+    CORRADE_ASSERT(id == -1 || UnsignedInt(id) < doLightCount(),
+        "Trade::AbstractImporter::lightForName(): implementation-returned index" << id << "out of range for" << doLightCount() << "entries", {});
+    return id;
 }
 
 Int AbstractImporter::doLightForName(const std::string&) { return -1; }
@@ -367,7 +379,10 @@ UnsignedInt AbstractImporter::doCameraCount() const { return 0; }
 
 Int AbstractImporter::cameraForName(const std::string& name) {
     CORRADE_ASSERT(isOpened(), "Trade::AbstractImporter::cameraForName(): no file opened", {});
-    return doCameraForName(name);
+    const Int id = doCameraForName(name);
+    CORRADE_ASSERT(id == -1 || UnsignedInt(id) < doCameraCount(),
+        "Trade::AbstractImporter::cameraForName(): implementation-returned index" << id << "out of range for" << doCameraCount() << "entries", {});
+    return id;
 }
 
 Int AbstractImporter::doCameraForName(const std::string&) { return -1; }
@@ -409,7 +424,10 @@ UnsignedInt AbstractImporter::doObject2DCount() const { return 0; }
 
 Int AbstractImporter::object2DForName(const std::string& name) {
     CORRADE_ASSERT(isOpened(), "Trade::AbstractImporter::object2DForName(): no file opened", {});
-    return doObject2DForName(name);
+    const Int id = doObject2DForName(name);
+    CORRADE_ASSERT(id == -1 || UnsignedInt(id) < doObject2DCount(),
+        "Trade::AbstractImporter::object2DForName(): implementation-returned index" << id << "out of range for" << doObject2DCount() << "entries", {});
+    return id;
 }
 
 Int AbstractImporter::doObject2DForName(const std::string&) { return -1; }
@@ -451,7 +469,10 @@ UnsignedInt AbstractImporter::doObject3DCount() const { return 0; }
 
 Int AbstractImporter::object3DForName(const std::string& name) {
     CORRADE_ASSERT(isOpened(), "Trade::AbstractImporter::object3DForName(): no file opened", {});
-    return doObject3DForName(name);
+    const Int id = doObject3DForName(name);
+    CORRADE_ASSERT(id == -1 || UnsignedInt(id) < doObject3DCount(),
+        "Trade::AbstractImporter::object3DForName(): implementation-returned index" << id << "out of range for" << doObject3DCount() << "entries", {});
+    return id;
 }
 
 Int AbstractImporter::doObject3DForName(const std::string&) { return -1; }
@@ -493,7 +514,10 @@ UnsignedInt AbstractImporter::doSkin2DCount() const { return 0; }
 
 Int AbstractImporter::skin2DForName(const std::string& name) {
     CORRADE_ASSERT(isOpened(), "Trade::AbstractImporter::skin2DForName(): no file opened", {});
-    return doSkin2DForName(name);
+    const Int id = doSkin2DForName(name);
+    CORRADE_ASSERT(id == -1 || UnsignedInt(id) < doSkin2DCount(),
+        "Trade::AbstractImporter::skin2DForName(): implementation-returned index" << id << "out of range for" << doSkin2DCount() << "entries", {});
+    return id;
 }
 
 Int AbstractImporter::doSkin2DForName(const std::string&) { return -1; }
@@ -540,7 +564,10 @@ UnsignedInt AbstractImporter::doSkin3DCount() const { return 0; }
 
 Int AbstractImporter::skin3DForName(const std::string& name) {
     CORRADE_ASSERT(isOpened(), "Trade::AbstractImporter::skin3DForName(): no file opened", {});
-    return doSkin3DForName(name);
+    const Int id = doSkin3DForName(name);
+    CORRADE_ASSERT(id == -1 || UnsignedInt(id) < doSkin3DCount(),
+        "Trade::AbstractImporter::skin3DForName(): implementation-returned index" << id << "out of range for" << doSkin3DCount() << "entries", {});
+    return id;
 }
 
 Int AbstractImporter::doSkin3DForName(const std::string&) { return -1; }
@@ -597,7 +624,10 @@ UnsignedInt AbstractImporter::doMeshLevelCount(UnsignedInt) { return 1; }
 
 Int AbstractImporter::meshForName(const std::string& name) {
     CORRADE_ASSERT(isOpened(), "Trade::AbstractImporter::meshForName(): no file opened", {});
-    return doMeshForName(name);
+    const Int id = doMeshForName(name);
+    CORRADE_ASSERT(id == -1 || UnsignedInt(id) < doMeshCount(),
+        "Trade::AbstractImporter::meshForName(): implementation-returned index" << id << "out of range for" << doMeshCount() << "entries", {});
+    return id;
 }
 
 Int AbstractImporter::doMeshForName(const std::string&) { return -1; }
@@ -765,7 +795,10 @@ UnsignedInt AbstractImporter::doMaterialCount() const { return 0; }
 
 Int AbstractImporter::materialForName(const std::string& name) {
     CORRADE_ASSERT(isOpened(), "Trade::AbstractImporter::materialForName(): no file opened", {});
-    return doMaterialForName(name);
+    const Int id = doMaterialForName(name);
+    CORRADE_ASSERT(id == -1 || UnsignedInt(id) < doMaterialCount(),
+        "Trade::AbstractImporter::materialForName(): implementation-returned index" << id << "out of range for" << doMaterialCount() << "entries", {});
+    return id;
 }
 
 Int AbstractImporter::doMaterialForName(const std::string&) { return -1; }
@@ -829,7 +862,10 @@ UnsignedInt AbstractImporter::doTextureCount() const { return 0; }
 
 Int AbstractImporter::textureForName(const std::string& name) {
     CORRADE_ASSERT(isOpened(), "Trade::AbstractImporter::textureForName(): no file opened", {});
-    return doTextureForName(name);
+    const Int id = doTextureForName(name);
+    CORRADE_ASSERT(id == -1 || UnsignedInt(id) < doTextureCount(),
+        "Trade::AbstractImporter::textureForName(): implementation-returned index" << id << "out of range for" << doTextureCount() << "entries", {});
+    return id;
 }
 
 Int AbstractImporter::doTextureForName(const std::string&) { return -1; }
@@ -881,7 +917,10 @@ UnsignedInt AbstractImporter::doImage1DLevelCount(UnsignedInt) { return 1; }
 
 Int AbstractImporter::image1DForName(const std::string& name) {
     CORRADE_ASSERT(isOpened(), "Trade::AbstractImporter::image1DForName(): no file opened", {});
-    return doImage1DForName(name);
+    const Int id = doImage1DForName(name);
+    CORRADE_ASSERT(id == -1 || UnsignedInt(id) < doImage1DCount(),
+        "Trade::AbstractImporter::image1DForName(): implementation-returned index" << id << "out of range for" << doImage1DCount() << "entries", {});
+    return id;
 }
 
 Int AbstractImporter::doImage1DForName(const std::string&) { return -1; }
@@ -948,7 +987,10 @@ UnsignedInt AbstractImporter::doImage2DLevelCount(UnsignedInt) { return 1; }
 
 Int AbstractImporter::image2DForName(const std::string& name) {
     CORRADE_ASSERT(isOpened(), "Trade::AbstractImporter::image2DForName(): no file opened", {});
-    return doImage2DForName(name);
+    const Int id = doImage2DForName(name);
+    CORRADE_ASSERT(id == -1 || UnsignedInt(id) < doImage2DCount(),
+        "Trade::AbstractImporter::image2DForName(): implementation-returned index" << id << "out of range for" << doImage2DCount() << "entries", {});
+    return id;
 }
 
 Int AbstractImporter::doImage2DForName(const std::string&) { return -1; }
@@ -1015,7 +1057,10 @@ UnsignedInt AbstractImporter::doImage3DLevelCount(UnsignedInt) { return 1; }
 
 Int AbstractImporter::image3DForName(const std::string& name) {
     CORRADE_ASSERT(isOpened(), "Trade::AbstractImporter::image3DForName(): no file opened", {});
-    return doImage3DForName(name);
+    const Int id = doImage3DForName(name);
+    CORRADE_ASSERT(id == -1 || UnsignedInt(id) < doImage3DCount(),
+        "Trade::AbstractImporter::image3DForName(): implementation-returned index" << id << "out of range for" << doImage3DCount() << "entries", {});
+    return id;
 }
 
 Int AbstractImporter::doImage3DForName(const std::string&) { return -1; }
diff --git a/src/Magnum/Trade/AbstractImporter.h b/src/Magnum/Trade/AbstractImporter.h
index d96020f52..586244403 100644
--- a/src/Magnum/Trade/AbstractImporter.h
+++ b/src/Magnum/Trade/AbstractImporter.h
@@ -681,10 +681,10 @@ class MAGNUM_TRADE_EXPORT AbstractImporter: public PluginManager::AbstractManagi
 
         /**
          * @brief Default scene
+         * @return Scene ID from range [0, @ref sceneCount()) or @cpp -1 @ce if
+         *      there's no default scene
          *
-         * When there is more than one scene, returns ID of the default one.
-         * If there is no default scene, returns @cpp -1 @ce. Expects that a
-         * file is opened.
+         * Expects that a file is opened.
          */
         Int defaultScene() const;
 
@@ -696,10 +696,11 @@ class MAGNUM_TRADE_EXPORT AbstractImporter: public PluginManager::AbstractManagi
         UnsignedInt sceneCount() const;
 
         /**
-         * @brief Scene ID for given name
+         * @brief Scene for given name
+         * @return Scene ID from range [0, @ref sceneCount()) or @cpp -1 @ce if
+         *      no scene for given name exists
          *
-         * If no scene for given name exists, returns @cpp -1 @ce. Expects that
-         * a file is opened.
+         * Expects that a file is opened.
          * @see @ref sceneName(), @ref scene(const std::string&)
          */
         Int sceneForName(const std::string& name);
@@ -744,10 +745,11 @@ class MAGNUM_TRADE_EXPORT AbstractImporter: public PluginManager::AbstractManagi
         UnsignedInt animationCount() const;
 
         /**
-         * @brief Animation ID for given name
+         * @brief Animation for given name
+         * @return Animation ID from range [0, @ref animationCount()) or
+         *      @cpp -1 @ce if no animation for given name exists
          *
-         * If no animation for given name exists, returns @cpp -1 @ce. Expects
-         * that a file is opened.
+         * Expects that a file is opened.
          * @see @ref animationName(), @ref animation(const std::string&)
          */
         Int animationForName(const std::string& name);
@@ -792,10 +794,11 @@ class MAGNUM_TRADE_EXPORT AbstractImporter: public PluginManager::AbstractManagi
         UnsignedInt lightCount() const;
 
         /**
-         * @brief Light ID for given name
+         * @brief Light for given name
+         * @return Light ID from range [0, @ref lightCount()) or @cpp -1 @ce if
+         *      no light for given name exists
          *
-         * If no light for given name exists, returns @cpp -1 @ce. Expects that
-         * a file is opened.
+         * Expects that a file is opened.
          * @see @ref lightName(), @ref light(const std::string&)
          */
         Int lightForName(const std::string& name);
@@ -840,10 +843,11 @@ class MAGNUM_TRADE_EXPORT AbstractImporter: public PluginManager::AbstractManagi
         UnsignedInt cameraCount() const;
 
         /**
-         * @brief Camera ID for given name
+         * @brief Camera for given name
+         * @return Camera ID from range [0, @ref cameraCount()) or @cpp -1 @ce
+         *      if no camera for given name exists
          *
-         * If no camera for given name exists, returns @cpp -1 @ce. Expects
-         * that a file is opened.
+         * Expects that a file is opened.
          * @see @ref cameraName(), @ref camera(const std::string&)
          */
         Int cameraForName(const std::string& name);
@@ -888,10 +892,11 @@ class MAGNUM_TRADE_EXPORT AbstractImporter: public PluginManager::AbstractManagi
         UnsignedInt object2DCount() const;
 
         /**
-         * @brief Two-dimensional object ID for given name
+         * @brief Two-dimensional object for given name
+         * @return Object ID from range [0, @ref object2DCount()) or
+         *      @cpp -1 @ce if no object for given name exists
          *
-         * If no object for given name exists, returns @cpp -1 @ce. Expects
-         * that a file is opened.
+         * Expects that a file is opened.
          * @see @ref object2DName(), @ref object2D(const std::string&)
          */
         Int object2DForName(const std::string& name);
@@ -936,10 +941,11 @@ class MAGNUM_TRADE_EXPORT AbstractImporter: public PluginManager::AbstractManagi
         UnsignedInt object3DCount() const;
 
         /**
-         * @brief Three-dimensional object ID for given name
+         * @brief Three-dimensional object for given name
+         * @return Object ID from range [0, @ref object3DCount()) or
+         *      @cpp -1 @ce if no object for given name exists
          *
-         * If no object for given name exists, returns @cpp -1 @ce. Expects
-         * that a file is opened.
+         * Expects that a file is opened.
          * @see @ref object3DName(), @ref object3D(const std::string&)
          */
         Int object3DForName(const std::string& name);
@@ -985,11 +991,12 @@ class MAGNUM_TRADE_EXPORT AbstractImporter: public PluginManager::AbstractManagi
         UnsignedInt skin2DCount() const;
 
         /**
-         * @brief Two-dimensional skin ID for given name
+         * @brief Two-dimensional skin for given name
+         * @return Skin ID from range [0, @ref skin2DCount()) or @cpp -1 @ce if
+         *      no skin for given name exists
          * @m_since_latest
          *
-         * If no skin for given name exists, returns @cpp -1 @ce. Expects that
-         * a file is opened.
+         * Expects that a file is opened.
          * @see @ref skin2DName(), @ref skin2D(const std::string&)
          */
         Int skin2DForName(const std::string& name);
@@ -1037,11 +1044,12 @@ class MAGNUM_TRADE_EXPORT AbstractImporter: public PluginManager::AbstractManagi
         UnsignedInt skin3DCount() const;
 
         /**
-         * @brief Three-dimensional skin ID for given name
+         * @brief Three-dimensional skin for given name
+         * @return Skin ID from range [0, @ref skin3DCount()) or @cpp -1 @ce if
+         *      no skin for given name exists
          * @m_since_latest
          *
-         * If no skin for given name exists, returns @cpp -1 @ce. Expects that
-         * a file is opened.
+         * Expects that a file is opened.
          * @see @ref skin3DName(), @ref skin3D(const std::string&)
          */
         Int skin3DForName(const std::string& name);
@@ -1100,11 +1108,12 @@ class MAGNUM_TRADE_EXPORT AbstractImporter: public PluginManager::AbstractManagi
         UnsignedInt meshLevelCount(UnsignedInt id);
 
         /**
-         * @brief Mesh ID for given name
+         * @brief Mesh for given name
+         * @return Mesh ID from range [0, @ref meshCount()) or @cpp -1 @ce if
+         *      no mesh for given name exists
          * @m_since{2020,06}
          *
-         * If no mesh for given name exists, returns @cpp -1 @ce. Expects that
-         * a file is opened.
+         * Expects that a file is opened.
          * @see @ref meshName(), @ref mesh(const std::string&, UnsignedInt)
          */
         Int meshForName(const std::string& name);
@@ -1267,10 +1276,11 @@ class MAGNUM_TRADE_EXPORT AbstractImporter: public PluginManager::AbstractManagi
         UnsignedInt materialCount() const;
 
         /**
-         * @brief Material ID for given name
+         * @brief Material for given name
+         * @return Material ID from range [0, @ref materialCount()) or
+         *      @cpp -1 @ce if no material for given name exists
          *
-         * If no material for given name exists, returns @cpp -1 @ce. Expects
-         * that a file is opened.
+         * Expects that a file is opened.
          * @see @ref materialName()
          */
         Int materialForName(const std::string& name);
@@ -1325,10 +1335,11 @@ class MAGNUM_TRADE_EXPORT AbstractImporter: public PluginManager::AbstractManagi
         UnsignedInt textureCount() const;
 
         /**
-         * @brief Texture ID for given name
+         * @brief Texture for given name
+         * @return Texture ID from range [0, @ref textureCount()) or
+         *      @cpp -1 @ce if no texture for given name exists
          *
-         * If no texture for given name exists, returns @cpp -1 @ce. Expects
-         * that a file is opened.
+         * Expects that a file is opened.
          * @see @ref textureName(), @ref texture(const std::string&)
          */
         Int textureForName(const std::string& name);
@@ -1384,10 +1395,11 @@ class MAGNUM_TRADE_EXPORT AbstractImporter: public PluginManager::AbstractManagi
         UnsignedInt image1DLevelCount(UnsignedInt id);
 
         /**
-         * @brief One-dimensional image ID for given name
+         * @brief One-dimensional image for given name
+         * @return Image ID from range [0, @ref image1DCount()) or @cpp -1 @ce
+         *      if no image for given name exists
          *
-         * If no image for given name exists, returns @cpp -1 @ce. Expects that
-         * a file is opened.
+         * Expects that a file is opened.
          * @see @ref image1DName(), @ref image1D(const std::string&, UnsignedInt)
          */
         Int image1DForName(const std::string& name);
@@ -1445,10 +1457,11 @@ class MAGNUM_TRADE_EXPORT AbstractImporter: public PluginManager::AbstractManagi
         UnsignedInt image2DLevelCount(UnsignedInt id);
 
         /**
-         * @brief Two-dimensional image ID for given name
+         * @brief Two-dimensional image for given name
+         * @return Image ID from range [0, @ref image2DCount()) or @cpp -1 @ce
+         *      if no image for given name exists
          *
-         * If no image for given name exists, returns @cpp -1 @ce. Expects that
-         * a file is opened.
+         * Expects that a file is opened.
          * @see @ref image2DName(), @ref image2D(const std::string&, UnsignedInt)
          */
         Int image2DForName(const std::string& name);
@@ -1506,10 +1519,11 @@ class MAGNUM_TRADE_EXPORT AbstractImporter: public PluginManager::AbstractManagi
         UnsignedInt image3DLevelCount(UnsignedInt id);
 
         /**
-         * @brief Three-dimensional image ID for given name
+         * @brief Three-dimensional image for given name
+         * @return Image ID from range [0, @ref image3DCount()) or @cpp -1 @ce
+         *      if no image for given name exists
          *
-         * If no image for given name exists, returns @cpp -1 @ce. Expects that
-         * a file is opened.
+         * Expects that a file is opened.
          * @see @ref image3DName(), @ref image3D(const std::string&, UnsignedInt)
          */
         Int image3DForName(const std::string& name);
diff --git a/src/Magnum/Trade/Test/AbstractImporterTest.cpp b/src/Magnum/Trade/Test/AbstractImporterTest.cpp
index 6013933e7..2eb7e6e8e 100644
--- a/src/Magnum/Trade/Test/AbstractImporterTest.cpp
+++ b/src/Magnum/Trade/Test/AbstractImporterTest.cpp
@@ -101,15 +101,18 @@ struct AbstractImporterTest: TestSuite::Tester {
 
     void defaultScene();
     void defaultSceneNotImplemented();
+    void defaultSceneOutOfRange();
 
     void scene();
     void sceneNameNotImplemented();
+    void sceneForNameOutOfRange();
     void sceneNameOutOfRange();
     void sceneNotImplemented();
     void sceneOutOfRange();
 
     void animation();
     void animationNameNotImplemented();
+    void animationForNameOutOfRange();
     void animationNameOutOfRange();
     void animationNotImplemented();
     void animationOutOfRange();
@@ -120,30 +123,35 @@ struct AbstractImporterTest: TestSuite::Tester {
 
     void light();
     void lightNameNotImplemented();
+    void lightForNameOutOfRange();
     void lightNameOutOfRange();
     void lightNotImplemented();
     void lightOutOfRange();
 
     void camera();
     void cameraNameNotImplemented();
+    void cameraForNameOutOfRange();
     void cameraNameOutOfRange();
     void cameraNotImplemented();
     void cameraOutOfRange();
 
     void object2D();
     void object2DNameNotImplemented();
+    void object2DForNameOutOfRange();
     void object2DNameOutOfRange();
     void object2DNotImplemented();
     void object2DOutOfRange();
 
     void object3D();
     void object3DNameNotImplemented();
+    void object3DForNameOutOfRange();
     void object3DNameOutOfRange();
     void object3DNotImplemented();
     void object3DOutOfRange();
 
     void skin2D();
     void skin2DNameNotImplemented();
+    void skin2DForNameOutOfRange();
     void skin2DNameOutOfRange();
     void skin2DNotImplemented();
     void skin2DOutOfRange();
@@ -153,6 +161,7 @@ struct AbstractImporterTest: TestSuite::Tester {
 
     void skin3D();
     void skin3DNameNotImplemented();
+    void skin3DForNameOutOfRange();
     void skin3DNameOutOfRange();
     void skin3DNotImplemented();
     void skin3DOutOfRange();
@@ -167,6 +176,7 @@ struct AbstractImporterTest: TestSuite::Tester {
     void meshLevelCountNotImplemented();
     void meshLevelCountOutOfRange();
     void meshLevelCountZero();
+    void meshForNameOutOfRange();
     void meshNameNotImplemented();
     void meshNameOutOfRange();
     void meshNotImplemented();
@@ -212,6 +222,7 @@ struct AbstractImporterTest: TestSuite::Tester {
     #ifdef MAGNUM_BUILD_DEPRECATED
     void materialDeprecatedFallback();
     #endif
+    void materialForNameOutOfRange();
     void materialNameNotImplemented();
     void materialNameOutOfRange();
     void materialNotImplemented();
@@ -221,6 +232,7 @@ struct AbstractImporterTest: TestSuite::Tester {
     void materialCustomLayerDataDeleter();
 
     void texture();
+    void textureForNameOutOfRange();
     void textureNameNotImplemented();
     void textureNameOutOfRange();
     void textureNotImplemented();
@@ -230,6 +242,7 @@ struct AbstractImporterTest: TestSuite::Tester {
     void image1DLevelCountNotImplemented();
     void image1DLevelCountOutOfRange();
     void image1DLevelCountZero();
+    void image1DForNameOutOfRange();
     void image1DNameNotImplemented();
     void image1DNameOutOfRange();
     void image1DNotImplemented();
@@ -243,6 +256,7 @@ struct AbstractImporterTest: TestSuite::Tester {
     void image2DLevelCountNotImplemented();
     void image2DLevelCountOutOfRange();
     void image2DLevelCountZero();
+    void image2DForNameOutOfRange();
     void image2DNameNotImplemented();
     void image2DNameOutOfRange();
     void image2DNotImplemented();
@@ -256,6 +270,7 @@ struct AbstractImporterTest: TestSuite::Tester {
     void image3DLevelCountNotImplemented();
     void image3DLevelCountOutOfRange();
     void image3DLevelCountZero();
+    void image3DForNameOutOfRange();
     void image3DNameNotImplemented();
     void image3DNameOutOfRange();
     void image3DNotImplemented();
@@ -326,15 +341,18 @@ AbstractImporterTest::AbstractImporterTest() {
               &AbstractImporterTest::thingNoFile,
 
               &AbstractImporterTest::defaultScene,
+              &AbstractImporterTest::defaultSceneOutOfRange,
               &AbstractImporterTest::defaultSceneNotImplemented,
 
               &AbstractImporterTest::scene,
+              &AbstractImporterTest::sceneForNameOutOfRange,
               &AbstractImporterTest::sceneNameNotImplemented,
               &AbstractImporterTest::sceneNameOutOfRange,
               &AbstractImporterTest::sceneNotImplemented,
               &AbstractImporterTest::sceneOutOfRange,
 
               &AbstractImporterTest::animation,
+              &AbstractImporterTest::animationForNameOutOfRange,
               &AbstractImporterTest::animationNameNotImplemented,
               &AbstractImporterTest::animationNameOutOfRange,
               &AbstractImporterTest::animationNotImplemented,
@@ -345,30 +363,35 @@ AbstractImporterTest::AbstractImporterTest() {
               &AbstractImporterTest::animationCustomTrackDeleter,
 
               &AbstractImporterTest::light,
+              &AbstractImporterTest::lightForNameOutOfRange,
               &AbstractImporterTest::lightNameNotImplemented,
               &AbstractImporterTest::lightNameOutOfRange,
               &AbstractImporterTest::lightNotImplemented,
               &AbstractImporterTest::lightOutOfRange,
 
               &AbstractImporterTest::camera,
+              &AbstractImporterTest::cameraForNameOutOfRange,
               &AbstractImporterTest::cameraNameNotImplemented,
               &AbstractImporterTest::cameraNameOutOfRange,
               &AbstractImporterTest::cameraNotImplemented,
               &AbstractImporterTest::cameraOutOfRange,
 
               &AbstractImporterTest::object2D,
+              &AbstractImporterTest::object2DForNameOutOfRange,
               &AbstractImporterTest::object2DNameNotImplemented,
               &AbstractImporterTest::object2DNameOutOfRange,
               &AbstractImporterTest::object2DNotImplemented,
               &AbstractImporterTest::object2DOutOfRange,
 
               &AbstractImporterTest::object3D,
+              &AbstractImporterTest::object3DForNameOutOfRange,
               &AbstractImporterTest::object3DNameNotImplemented,
               &AbstractImporterTest::object3DNameOutOfRange,
               &AbstractImporterTest::object3DNotImplemented,
               &AbstractImporterTest::object3DOutOfRange,
 
               &AbstractImporterTest::skin2D,
+              &AbstractImporterTest::skin2DForNameOutOfRange,
               &AbstractImporterTest::skin2DNameNotImplemented,
               &AbstractImporterTest::skin2DNameOutOfRange,
               &AbstractImporterTest::skin2DNotImplemented,
@@ -378,6 +401,7 @@ AbstractImporterTest::AbstractImporterTest() {
               &AbstractImporterTest::skin2DCustomInverseBindMatrixDataDeleter,
 
               &AbstractImporterTest::skin3D,
+              &AbstractImporterTest::skin3DForNameOutOfRange,
               &AbstractImporterTest::skin3DNameNotImplemented,
               &AbstractImporterTest::skin3DNameOutOfRange,
               &AbstractImporterTest::skin3DNotImplemented,
@@ -393,6 +417,7 @@ AbstractImporterTest::AbstractImporterTest() {
               &AbstractImporterTest::meshLevelCountNotImplemented,
               &AbstractImporterTest::meshLevelCountOutOfRange,
               &AbstractImporterTest::meshLevelCountZero,
+              &AbstractImporterTest::meshForNameOutOfRange,
               &AbstractImporterTest::meshNameNotImplemented,
               &AbstractImporterTest::meshNameOutOfRange,
               &AbstractImporterTest::meshNotImplemented,
@@ -438,6 +463,7 @@ AbstractImporterTest::AbstractImporterTest() {
               #ifdef MAGNUM_BUILD_DEPRECATED
               &AbstractImporterTest::materialDeprecatedFallback,
               #endif
+              &AbstractImporterTest::materialForNameOutOfRange,
               &AbstractImporterTest::materialNameNotImplemented,
               &AbstractImporterTest::materialNameOutOfRange,
               &AbstractImporterTest::materialNotImplemented,
@@ -447,6 +473,7 @@ AbstractImporterTest::AbstractImporterTest() {
               &AbstractImporterTest::materialCustomLayerDataDeleter,
 
               &AbstractImporterTest::texture,
+              &AbstractImporterTest::textureForNameOutOfRange,
               &AbstractImporterTest::textureNameNotImplemented,
               &AbstractImporterTest::textureNameOutOfRange,
               &AbstractImporterTest::textureNotImplemented,
@@ -456,6 +483,7 @@ AbstractImporterTest::AbstractImporterTest() {
               &AbstractImporterTest::image1DLevelCountNotImplemented,
               &AbstractImporterTest::image1DLevelCountOutOfRange,
               &AbstractImporterTest::image1DLevelCountZero,
+              &AbstractImporterTest::image1DForNameOutOfRange,
               &AbstractImporterTest::image1DNameNotImplemented,
               &AbstractImporterTest::image1DNameOutOfRange,
               &AbstractImporterTest::image1DNotImplemented,
@@ -469,6 +497,7 @@ AbstractImporterTest::AbstractImporterTest() {
               &AbstractImporterTest::image2DLevelCountNotImplemented,
               &AbstractImporterTest::image2DLevelCountOutOfRange,
               &AbstractImporterTest::image2DLevelCountZero,
+              &AbstractImporterTest::image2DForNameOutOfRange,
               &AbstractImporterTest::image2DNameNotImplemented,
               &AbstractImporterTest::image2DNameOutOfRange,
               &AbstractImporterTest::image2DNotImplemented,
@@ -482,6 +511,7 @@ AbstractImporterTest::AbstractImporterTest() {
               &AbstractImporterTest::image3DLevelCountNotImplemented,
               &AbstractImporterTest::image3DLevelCountOutOfRange,
               &AbstractImporterTest::image3DLevelCountZero,
+              &AbstractImporterTest::image3DForNameOutOfRange,
               &AbstractImporterTest::image3DNameNotImplemented,
               &AbstractImporterTest::image3DNameOutOfRange,
               &AbstractImporterTest::image3DNotImplemented,
@@ -1446,6 +1476,7 @@ void AbstractImporterTest::defaultScene() {
         bool doIsOpened() const override { return true; }
         void doClose() override {}
 
+        UnsignedInt doSceneCount() const override { return 43; }
         Int doDefaultScene() const override { return 42; }
     } importer;
 
@@ -1462,6 +1493,26 @@ void AbstractImporterTest::defaultSceneNotImplemented() {
     CORRADE_COMPARE(importer.defaultScene(), -1);
 }
 
+void AbstractImporterTest::defaultSceneOutOfRange() {
+    #ifdef CORRADE_NO_ASSERT
+    CORRADE_SKIP("CORRADE_NO_ASSERT defined, can't test assertions");
+    #endif
+
+    struct: AbstractImporter {
+        ImporterFeatures doFeatures() const override { return {}; }
+        bool doIsOpened() const override { return true; }
+        void doClose() override {}
+
+        UnsignedInt doSceneCount() const override { return 8; }
+        Int doDefaultScene() const override { return 8; }
+    } importer;
+
+    std::ostringstream out;
+    Error redirectError{&out};
+    importer.defaultScene();
+    CORRADE_COMPARE(out.str(), "Trade::AbstractImporter::defaultScene(): implementation-returned index 8 out of range for 8 entries\n");
+}
+
 int state;
 
 void AbstractImporterTest::scene() {
@@ -1500,6 +1551,26 @@ void AbstractImporterTest::scene() {
     }
 }
 
+void AbstractImporterTest::sceneForNameOutOfRange() {
+    #ifdef CORRADE_NO_ASSERT
+    CORRADE_SKIP("CORRADE_NO_ASSERT defined, can't test assertions");
+    #endif
+
+    struct: AbstractImporter {
+        ImporterFeatures doFeatures() const override { return {}; }
+        bool doIsOpened() const override { return true; }
+        void doClose() override {}
+
+        UnsignedInt doSceneCount() const override { return 8; }
+        Int doSceneForName(const std::string&) override { return 8; }
+    } importer;
+
+    std::ostringstream out;
+    Error redirectError{&out};
+    importer.sceneForName("");
+    CORRADE_COMPARE(out.str(), "Trade::AbstractImporter::sceneForName(): implementation-returned index 8 out of range for 8 entries\n");
+}
+
 void AbstractImporterTest::sceneNameNotImplemented() {
     struct: AbstractImporter {
         ImporterFeatures doFeatures() const override { return {}; }
@@ -1613,6 +1684,26 @@ void AbstractImporterTest::animation() {
     }
 }
 
+void AbstractImporterTest::animationForNameOutOfRange() {
+    #ifdef CORRADE_NO_ASSERT
+    CORRADE_SKIP("CORRADE_NO_ASSERT defined, can't test assertions");
+    #endif
+
+    struct: AbstractImporter {
+        ImporterFeatures doFeatures() const override { return {}; }
+        bool doIsOpened() const override { return true; }
+        void doClose() override {}
+
+        UnsignedInt doAnimationCount() const override { return 8; }
+        Int doAnimationForName(const std::string&) override { return 8; }
+    } importer;
+
+    std::ostringstream out;
+    Error redirectError{&out};
+    importer.animationForName("");
+    CORRADE_COMPARE(out.str(), "Trade::AbstractImporter::animationForName(): implementation-returned index 8 out of range for 8 entries\n");
+}
+
 void AbstractImporterTest::animationNameNotImplemented() {
     struct: AbstractImporter {
         ImporterFeatures doFeatures() const override { return {}; }
@@ -1816,6 +1907,26 @@ void AbstractImporterTest::light() {
     }
 }
 
+void AbstractImporterTest::lightForNameOutOfRange() {
+    #ifdef CORRADE_NO_ASSERT
+    CORRADE_SKIP("CORRADE_NO_ASSERT defined, can't test assertions");
+    #endif
+
+    struct: AbstractImporter {
+        ImporterFeatures doFeatures() const override { return {}; }
+        bool doIsOpened() const override { return true; }
+        void doClose() override {}
+
+        UnsignedInt doLightCount() const override { return 8; }
+        Int doLightForName(const std::string&) override { return 8; }
+    } importer;
+
+    std::ostringstream out;
+    Error redirectError{&out};
+    importer.lightForName("");
+    CORRADE_COMPARE(out.str(), "Trade::AbstractImporter::lightForName(): implementation-returned index 8 out of range for 8 entries\n");
+}
+
 void AbstractImporterTest::lightNameNotImplemented() {
     struct: AbstractImporter {
         ImporterFeatures doFeatures() const override { return {}; }
@@ -1924,6 +2035,26 @@ void AbstractImporterTest::camera() {
     }
 }
 
+void AbstractImporterTest::cameraForNameOutOfRange() {
+    #ifdef CORRADE_NO_ASSERT
+    CORRADE_SKIP("CORRADE_NO_ASSERT defined, can't test assertions");
+    #endif
+
+    struct: AbstractImporter {
+        ImporterFeatures doFeatures() const override { return {}; }
+        bool doIsOpened() const override { return true; }
+        void doClose() override {}
+
+        UnsignedInt doCameraCount() const override { return 8; }
+        Int doCameraForName(const std::string&) override { return 8; }
+    } importer;
+
+    std::ostringstream out;
+    Error redirectError{&out};
+    importer.cameraForName("");
+    CORRADE_COMPARE(out.str(), "Trade::AbstractImporter::cameraForName(): implementation-returned index 8 out of range for 8 entries\n");
+}
+
 void AbstractImporterTest::cameraNameNotImplemented() {
     struct: AbstractImporter {
         ImporterFeatures doFeatures() const override { return {}; }
@@ -2032,6 +2163,26 @@ void AbstractImporterTest::object2D() {
     }
 }
 
+void AbstractImporterTest::object2DForNameOutOfRange() {
+    #ifdef CORRADE_NO_ASSERT
+    CORRADE_SKIP("CORRADE_NO_ASSERT defined, can't test assertions");
+    #endif
+
+    struct: AbstractImporter {
+        ImporterFeatures doFeatures() const override { return {}; }
+        bool doIsOpened() const override { return true; }
+        void doClose() override {}
+
+        UnsignedInt doObject2DCount() const override { return 8; }
+        Int doObject2DForName(const std::string&) override { return 8; }
+    } importer;
+
+    std::ostringstream out;
+    Error redirectError{&out};
+    importer.object2DForName("");
+    CORRADE_COMPARE(out.str(), "Trade::AbstractImporter::object2DForName(): implementation-returned index 8 out of range for 8 entries\n");
+}
+
 void AbstractImporterTest::object2DNameNotImplemented() {
     struct: AbstractImporter {
         ImporterFeatures doFeatures() const override { return {}; }
@@ -2140,6 +2291,26 @@ void AbstractImporterTest::object3D() {
     }
 }
 
+void AbstractImporterTest::object3DForNameOutOfRange() {
+    #ifdef CORRADE_NO_ASSERT
+    CORRADE_SKIP("CORRADE_NO_ASSERT defined, can't test assertions");
+    #endif
+
+    struct: AbstractImporter {
+        ImporterFeatures doFeatures() const override { return {}; }
+        bool doIsOpened() const override { return true; }
+        void doClose() override {}
+
+        UnsignedInt doObject3DCount() const override { return 8; }
+        Int doObject3DForName(const std::string&) override { return 8; }
+    } importer;
+
+    std::ostringstream out;
+    Error redirectError{&out};
+    importer.object3DForName("");
+    CORRADE_COMPARE(out.str(), "Trade::AbstractImporter::object3DForName(): implementation-returned index 8 out of range for 8 entries\n");
+}
+
 void AbstractImporterTest::object3DNameNotImplemented() {
     struct: AbstractImporter {
         ImporterFeatures doFeatures() const override { return {}; }
@@ -2250,6 +2421,26 @@ void AbstractImporterTest::skin2D() {
     }
 }
 
+void AbstractImporterTest::skin2DForNameOutOfRange() {
+    #ifdef CORRADE_NO_ASSERT
+    CORRADE_SKIP("CORRADE_NO_ASSERT defined, can't test assertions");
+    #endif
+
+    struct: AbstractImporter {
+        ImporterFeatures doFeatures() const override { return {}; }
+        bool doIsOpened() const override { return true; }
+        void doClose() override {}
+
+        UnsignedInt doSkin2DCount() const override { return 8; }
+        Int doSkin2DForName(const std::string&) override { return 8; }
+    } importer;
+
+    std::ostringstream out;
+    Error redirectError{&out};
+    importer.skin2DForName("");
+    CORRADE_COMPARE(out.str(), "Trade::AbstractImporter::skin2DForName(): implementation-returned index 8 out of range for 8 entries\n");
+}
+
 void AbstractImporterTest::skin2DNameNotImplemented() {
     struct: AbstractImporter {
         ImporterFeatures doFeatures() const override { return {}; }
@@ -2442,6 +2633,27 @@ void AbstractImporterTest::skin3D() {
     }
 }
 
+void AbstractImporterTest::skin3DForNameOutOfRange() {
+    #ifdef CORRADE_NO_ASSERT
+    CORRADE_SKIP("CORRADE_NO_ASSERT defined, can't test assertions");
+    #endif
+
+    struct: AbstractImporter {
+        ImporterFeatures doFeatures() const override { return {}; }
+        bool doIsOpened() const override { return true; }
+        void doClose() override {}
+
+        UnsignedInt doSkin3DCount() const override { return 8; }
+        Int doSkin3DForName(const std::string&) override { return 8; }
+    } importer;
+
+    std::ostringstream out;
+    Error redirectError{&out};
+
+    importer.skin3DForName("");
+    CORRADE_COMPARE(out.str(), "Trade::AbstractImporter::skin3DForName(): implementation-returned index 8 out of range for 8 entries\n");
+}
+
 void AbstractImporterTest::skin3DNameNotImplemented() {
     struct: AbstractImporter {
         ImporterFeatures doFeatures() const override { return {}; }
@@ -2736,6 +2948,26 @@ void AbstractImporterTest::meshLevelCountZero() {
         "Trade::AbstractImporter::mesh(): implementation reported zero levels\n");
 }
 
+void AbstractImporterTest::meshForNameOutOfRange() {
+    #ifdef CORRADE_NO_ASSERT
+    CORRADE_SKIP("CORRADE_NO_ASSERT defined, can't test assertions");
+    #endif
+
+    struct: AbstractImporter {
+        ImporterFeatures doFeatures() const override { return {}; }
+        bool doIsOpened() const override { return true; }
+        void doClose() override {}
+
+        UnsignedInt doMeshCount() const override { return 8; }
+        Int doMeshForName(const std::string&) override { return 8; }
+    } importer;
+
+    std::ostringstream out;
+    Error redirectError{&out};
+    importer.meshForName("");
+    CORRADE_COMPARE(out.str(), "Trade::AbstractImporter::meshForName(): implementation-returned index 8 out of range for 8 entries\n");
+}
+
 void AbstractImporterTest::meshNameNotImplemented() {
     struct: AbstractImporter {
         ImporterFeatures doFeatures() const override { return {}; }
@@ -3544,6 +3776,26 @@ void AbstractImporterTest::materialDeprecatedFallback() {
 }
 #endif
 
+void AbstractImporterTest::materialForNameOutOfRange() {
+    #ifdef CORRADE_NO_ASSERT
+    CORRADE_SKIP("CORRADE_NO_ASSERT defined, can't test assertions");
+    #endif
+
+    struct: AbstractImporter {
+        ImporterFeatures doFeatures() const override { return {}; }
+        bool doIsOpened() const override { return true; }
+        void doClose() override {}
+
+        UnsignedInt doMaterialCount() const override { return 8; }
+        Int doMaterialForName(const std::string&) override { return 8; }
+    } importer;
+
+    std::ostringstream out;
+    Error redirectError{&out};
+    importer.materialForName("");
+    CORRADE_COMPARE(out.str(), "Trade::AbstractImporter::materialForName(): implementation-returned index 8 out of range for 8 entries\n");
+}
+
 void AbstractImporterTest::materialNameNotImplemented() {
     struct: AbstractImporter {
         ImporterFeatures doFeatures() const override { return {}; }
@@ -3735,6 +3987,26 @@ void AbstractImporterTest::texture() {
     }
 }
 
+void AbstractImporterTest::textureForNameOutOfRange() {
+    #ifdef CORRADE_NO_ASSERT
+    CORRADE_SKIP("CORRADE_NO_ASSERT defined, can't test assertions");
+    #endif
+
+    struct: AbstractImporter {
+        ImporterFeatures doFeatures() const override { return {}; }
+        bool doIsOpened() const override { return true; }
+        void doClose() override {}
+
+        UnsignedInt doTextureCount() const override { return 8; }
+        Int doTextureForName(const std::string&) override { return 8; }
+    } importer;
+
+    std::ostringstream out;
+    Error redirectError{&out};
+    importer.textureForName("");
+    CORRADE_COMPARE(out.str(), "Trade::AbstractImporter::textureForName(): implementation-returned index 8 out of range for 8 entries\n");
+}
+
 void AbstractImporterTest::textureNameNotImplemented() {
     struct: AbstractImporter {
         ImporterFeatures doFeatures() const override { return {}; }
@@ -3907,6 +4179,26 @@ void AbstractImporterTest::image1DLevelCountZero() {
         "Trade::AbstractImporter::image1D(): implementation reported zero levels\n");
 }
 
+void AbstractImporterTest::image1DForNameOutOfRange() {
+    #ifdef CORRADE_NO_ASSERT
+    CORRADE_SKIP("CORRADE_NO_ASSERT defined, can't test assertions");
+    #endif
+
+    struct: AbstractImporter {
+        ImporterFeatures doFeatures() const override { return {}; }
+        bool doIsOpened() const override { return true; }
+        void doClose() override {}
+
+        UnsignedInt doImage1DCount() const override { return 8; }
+        Int doImage1DForName(const std::string&) override { return 8; }
+    } importer;
+
+    std::ostringstream out;
+    Error redirectError{&out};
+    importer.image1DForName("");
+    CORRADE_COMPARE(out.str(), "Trade::AbstractImporter::image1DForName(): implementation-returned index 8 out of range for 8 entries\n");
+}
+
 void AbstractImporterTest::image1DNameNotImplemented() {
     struct: AbstractImporter {
         ImporterFeatures doFeatures() const override { return {}; }
@@ -4168,6 +4460,26 @@ void AbstractImporterTest::image2DLevelCountZero() {
         "Trade::AbstractImporter::image2D(): implementation reported zero levels\n");
 }
 
+void AbstractImporterTest::image2DForNameOutOfRange() {
+    #ifdef CORRADE_NO_ASSERT
+    CORRADE_SKIP("CORRADE_NO_ASSERT defined, can't test assertions");
+    #endif
+
+    struct: AbstractImporter {
+        ImporterFeatures doFeatures() const override { return {}; }
+        bool doIsOpened() const override { return true; }
+        void doClose() override {}
+
+        UnsignedInt doImage2DCount() const override { return 8; }
+        Int doImage2DForName(const std::string&) override { return 8; }
+    } importer;
+
+    std::ostringstream out;
+    Error redirectError{&out};
+    importer.image2DForName("");
+    CORRADE_COMPARE(out.str(), "Trade::AbstractImporter::image2DForName(): implementation-returned index 8 out of range for 8 entries\n");
+}
+
 void AbstractImporterTest::image2DNameNotImplemented() {
     struct: AbstractImporter {
         ImporterFeatures doFeatures() const override { return {}; }
@@ -4370,6 +4682,26 @@ void AbstractImporterTest::image3D() {
     }
 }
 
+void AbstractImporterTest::image3DForNameOutOfRange() {
+    #ifdef CORRADE_NO_ASSERT
+    CORRADE_SKIP("CORRADE_NO_ASSERT defined, can't test assertions");
+    #endif
+
+    struct: AbstractImporter {
+        ImporterFeatures doFeatures() const override { return {}; }
+        bool doIsOpened() const override { return true; }
+        void doClose() override {}
+
+        UnsignedInt doImage3DCount() const override { return 8; }
+        Int doImage3DForName(const std::string&) override { return 8; }
+    } importer;
+
+    std::ostringstream out;
+    Error redirectError{&out};
+    importer.image3DForName("");
+    CORRADE_COMPARE(out.str(), "Trade::AbstractImporter::image3DForName(): implementation-returned index 8 out of range for 8 entries\n");
+}
+
 void AbstractImporterTest::image3DLevelCountNotImplemented() {
     struct: AbstractImporter {
         ImporterFeatures doFeatures() const override { return {}; }