Review: Simplify test assertion by using ArchUnit infrastructure and Guava AssertJ

Issue: #187
Signed-off-by: Peter Gafert <[email protected]>

Author: codecholeric

Diff for: archunit/src/test/java/com/tngtech/archunit/core/domain/JavaClassTest.java

@@ -83,15 +83,15 @@ public void finds_array_type() {
         JavaMethod method = importClassWithContext(IsArrayTestClass.class).getMethod("anArray");
 
         assertThat(method.getRawReturnType().isArray()).isTrue();
-        assertThat(method.getRawReturnType().tryGetComponentType().get().getName()).isEqualTo("java.lang.Object");
+        assertThat(method.getRawReturnType().tryGetComponentType().get()).matches(Object.class);
     }
 
     @Test
     public void finds_non_array_type() {
         JavaMethod method = importClassWithContext(IsArrayTestClass.class).getMethod("notAnArray");
 
         assertThat(method.getRawReturnType().isArray()).isFalse();
-        assertThat(method.getRawReturnType().tryGetComponentType().isPresent()).isFalse();
+        assertThat(method.getRawReturnType().tryGetComponentType()).isAbsent();
     }
 
     @Test
@@ -1152,4 +1152,4 @@ private class NestedNamedInnerClass {
             }
         }
     }
-}
+}