ObjImporter: test also normal index out of range.

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src/MagnumPlugins/ObjImporter/Test/ObjImporterTest.cpp

@@ -101,7 +101,8 @@ const struct {
     {"invalid float literal", "error while converting numeric data"},
     {"invalid integer literal", "error while converting numeric data"},
     {"position index out of range", "index 1 out of range for 1 vertices"},
-    {"texture index out of range", "index 2 out of range for 1 vertices"},
+    {"texture index out of range", "index 4 out of range for 3 vertices"},
+    {"normal index out of range", "index 3 out of range for 2 vertices"},
     {"zero index", "index 0 out of range for 1 vertices"}
 };
 

src/MagnumPlugins/ObjImporter/Test/invalid-numbers.obj

@@ -14,8 +14,17 @@ p 1
 o texture index out of range
 v 1 0 2
 vt 0 1
-# Should be 4/1
-p 4/2
+vt 0 1
+vt 0 1
+# Should be 4/3
+p 4/4
+
+o normal index out of range
+v 1 0 2
+vn 0 0 1
+vn 0 0 1
+# Should be 5/2
+p 5//3
 
 o zero index
 v 1 0 2