### Question:
ClassNameUtils { public static boolean isPrimitive(String className) { String internalName = toFormat(className, TypeFormat.INTERNAL); return internalPrimitiveToBinaryName.containsKey(internalName); }  static String binaryToInternal(String binaryName); static String getComponentBase(String className); static String getComponentType(String className); static int getDimensionCount(String className); static String getPackageName(String className); static @Nullable String getPrimitive(String className); static Class<?> getPrimitiveClass(String className); static @Nullable String getWrapper(String className); static String internalToBinary(String internalName); static String internalToSource(String internalName); static boolean isObject(String type); static boolean isPrimitive(String className); static boolean isPrimitiveOrWrapper(String className); static boolean isWrapper(String className); static String sourceToBinary(String sourceName); static String sourceToInternal(String sourceName); static String toFormat(String className, TypeFormat format); static String toInternal(Class<?> klazz); static List<String> toInternal(Class<?>... classes); static ReferenceType guessReferenceType(@Nonnull String s);  }### Answer:
@Test public void canDetermineIsPrimitive() { for (Entry<String, Boolean> entry : internalNameToIsPrimitive.entrySet()) { String className = entry.getKey(); boolean expected = entry.getValue(); boolean actual = ClassNameUtils.isPrimitive(className); assertEquals(expected, actual, "class: " + className); } }