Math: test Matrix[34]::scalingSquared().

src/Magnum/Math/Test/Matrix3Test.cpp

@@ -525,6 +525,7 @@ void Matrix3Test::scalingPart() {
         Matrix3::scaling({0.5f, 3.5f});
 
     CORRADE_COMPARE(translationRotationScaling.scaling(), (Vector2{0.5f, 3.5f}));
+    CORRADE_COMPARE(translationRotationScaling.scalingSquared(), (Vector2{0.25f, 12.25f}));
 }
 
 void Matrix3Test::uniformScalingPart() {

src/Magnum/Math/Test/Matrix4Test.cpp

@@ -713,6 +713,7 @@ void Matrix4Test::scalingPart() {
         Matrix4::scaling({0.5f, 3.5f, 1.2f});
 
     CORRADE_COMPARE(translationRotationScaling.scaling(), (Vector3{0.5f, 3.5f, 1.2f}));
+    CORRADE_COMPARE(translationRotationScaling.scalingSquared(), (Vector3{0.25f, 12.25f, 1.44f}));
 }
 
 void Matrix4Test::uniformScalingPart() {