Sitebricks Matchers

Matchers.java

 @Test
 public void fetchCustomers() throws Exception {
   final User anyAdminUser = newUser().markAsAdmin().build();
   context.checking(new Expectations() {{

     oneOf(userSecurity).currentUser();
     will(returnValue(anyAdminUser));

     oneOf(customerBase).fetchCustomers();
     will(returnValue(Lists.newArrayList(new Customer(1L, "::namespace_one::", ""), new Customer(2L, "::namespace_two::", ""))));
   }});
   
   Reply<?> reply = new CustomerService(customerBase, userSecurity, userBase).getCustomers();

   assertThat(reply, isOk());
   assertThat(reply, containsJson(aNewJsonArray().withElements(
            aNewJson().add("id", 1L).add("namespace", "::namespace_one::"),
            aNewJson().add("id", 2L).add("namespace", "::namespace_two::")
   )));
 }

public static Matcher<Reply<?>> containsJson(final JsonBuilder content) {
    return new TypeSafeMatcher<Reply<?>>() {
      @Override
      protected boolean matchesSafely(Reply<?> item) {
        Key<? extends Transport> key = property("transport", item);
        // Default transport is Text which means that JSON transport
        // wasn't specified and error should be returned.
        if (Key.get(Text.class).equals(key)) {
          return false;
        }
        String jsonContent = asJsonContent(item);
        return jsonContent.equalsIgnoreCase(content.build());
      }

      @Override
      public void describeTo(Description description) {
        description.appendText(content.build());
      }

      @Override
      protected void describeMismatchSafely(Reply<?> item, Description mismatchDescription) {
        Key<? extends Transport> key = property("transport", item);
        // Default transport is Text which means that JSON transport
        // wasn't specified and error should be returned.
        if (Key.get(Text.class).equals(key)) {
          mismatchDescription.appendText("Text Transport was specified.");
          return;
        }

        String jsonContent = asJsonContent(item);
        mismatchDescription.appendText("was ");
        mismatchDescription.appendText(jsonContent);
      }

      private String asJsonContent(Reply<?> reply) {
        Object value = property("entity", reply);
        return new Gson().toJson(value);
      }
    };
  }