DebugTools: supply two different materials to the "same" test.

Otherwise the code could also just return true only if the instances are
the exact same location in memory, which is definitely undesired.

src/Magnum/DebugTools/Test/CompareMaterialTest.cpp

@@ -47,21 +47,39 @@ using namespace Math::Literals;
 
 const struct {
     const char* name;
-    Trade::MaterialData material;
+    Trade::MaterialData actual;
+    Trade::MaterialData expected;
 } SameData[]{
-    {"empty", Trade::MaterialData{{}, {}}},
-    {"empty with types", Trade::MaterialData{Trade::MaterialType::PbrMetallicRoughness|Trade::MaterialType::PbrClearCoat, {}}},
-    {"base attributes", Trade::MaterialData{Trade::MaterialType::Phong, {
-        {Trade::MaterialAttribute::DiffuseColor, 0x556699aa_rgbaf},
-        {Trade::MaterialAttribute::NormalTexture, 5u},
-        {"name", "hello"_s},
-    }}},
-    {"layers", Trade::MaterialData{Trade::MaterialType::PbrMetallicRoughness|Trade::MaterialType::PbrClearCoat, {
-        {Trade::MaterialAttribute::NormalTexture, 5u},
-        {Trade::MaterialLayer::ClearCoat},
-        {Trade::MaterialAttribute::LayerFactor, 0.76f},
-        {"name", "hello"_s},
-    }, {1, 3, 4}}},
+    {"empty",
+        Trade::MaterialData{{}, {}},
+        Trade::MaterialData{{}, {}}},
+    {"empty with types",
+        Trade::MaterialData{Trade::MaterialType::PbrMetallicRoughness|Trade::MaterialType::PbrClearCoat, {}},
+        Trade::MaterialData{Trade::MaterialType::PbrMetallicRoughness|Trade::MaterialType::PbrClearCoat, {}}},
+    {"base attributes",
+        Trade::MaterialData{Trade::MaterialType::Phong, {
+            {Trade::MaterialAttribute::DiffuseColor, 0x556699aa_rgbaf},
+            {Trade::MaterialAttribute::NormalTexture, 5u},
+            {"name", "hello"_s},
+        }},
+        Trade::MaterialData{Trade::MaterialType::Phong, {
+            {"name", "hello"_s},
+            {Trade::MaterialAttribute::DiffuseColor, 0x556699aa_rgbaf},
+            {Trade::MaterialAttribute::NormalTexture, 5u},
+        }}},
+    {"layers",
+        Trade::MaterialData{Trade::MaterialType::PbrMetallicRoughness|Trade::MaterialType::PbrClearCoat, {
+            {Trade::MaterialAttribute::NormalTexture, 5u},
+            {Trade::MaterialLayer::ClearCoat},
+            {Trade::MaterialAttribute::LayerFactor, 0.76f},
+            {"name", "hello"_s},
+        }, {1, 3, 4}},
+        Trade::MaterialData{Trade::MaterialType::PbrMetallicRoughness|Trade::MaterialType::PbrClearCoat, {
+            {Trade::MaterialAttribute::NormalTexture, 5u},
+            {Trade::MaterialAttribute::LayerFactor, 0.76f},
+            {Trade::MaterialLayer::ClearCoat},
+            {"name", "hello"_s},
+        }, {1, 3, 4}}},
 };
 
 const struct {
@@ -271,7 +289,7 @@ void CompareMaterialTest::same() {
     auto&& data = SameData[testCaseInstanceId()];
     setTestCaseDescription(data.name);
 
-    CORRADE_COMPARE_AS(data.material, data.material, CompareMaterial);
+    CORRADE_COMPARE_AS(data.actual, data.expected, CompareMaterial);
 }
 
 void CompareMaterialTest::different() {