Test ResourceState debug output.

src/Magnum/Test/ResourceManagerTest.cpp

@@ -45,6 +45,8 @@ struct ResourceManagerTest: TestSuite::Tester {
     void clear();
     void clearWhileReferenced();
     void loader();
+
+    void debugResourceState();
 };
 
 struct Data {
@@ -69,7 +71,9 @@ ResourceManagerTest::ResourceManagerTest() {
               &ResourceManagerTest::defaults,
               &ResourceManagerTest::clear,
               &ResourceManagerTest::clearWhileReferenced,
-              &ResourceManagerTest::loader});
+              &ResourceManagerTest::loader,
+
+              &ResourceManagerTest::debugResourceState});
 }
 
 void ResourceManagerTest::state() {
@@ -326,6 +330,12 @@ void ResourceManagerTest::loader() {
     CORRADE_COMPARE(Data::count, 0);
 }
 
+void ResourceManagerTest::debugResourceState() {
+    std::ostringstream out;
+    Debug{&out} << ResourceState::Loading;
+    CORRADE_COMPARE(out.str(), "ResourceState::Loading\n");
+}
+
 }}
 
 CORRADE_TEST_MAIN(Magnum::Test::ResourceManagerTest)