Add not trivial json tests

Author: blacelle

plugin-maven/src/test/java/com/diffplug/spotless/maven/json/JsonTest.java

@@ -21,7 +21,7 @@
 
 public class JsonTest extends MavenIntegrationHarness {
 	@Test
-	public void testFormatJson_WithSimple_defaultConfig() throws Exception {
+	public void testFormatJson_WithSimple_defaultConfig_sortByKeys() throws Exception {
 		writePomWithJsonSteps("<simple/>");
 
 		setFile("json_test.json").toResource("json/sortByKeysBefore.json");
@@ -30,11 +30,30 @@ public void testFormatJson_WithSimple_defaultConfig() throws Exception {
 	}
 
 	@Test
-	public void testFormatJson_WithGson_defaultConfig() throws Exception {
+	public void testFormatJson_WithSimple_defaultConfig_nestedObject() throws Exception {
+		writePomWithJsonSteps("<simple/>");
+
+		setFile("json_test.json").toResource("json/nestedObjectBefore.json");
+		mavenRunner().withArguments("spotless:apply").runNoError().error();
+		assertFile("json_test.json").sameAsResource("json/nestedObjectAfter.json");
+	}
+
+	@Test
+	public void testFormatJson_WithGson_defaultConfig_sortByKeys() throws Exception {
 		writePomWithJsonSteps("<gson/>");
 
 		setFile("json_test.json").toResource("json/sortByKeysBefore.json");
 		mavenRunner().withArguments("spotless:apply").runNoError().error();
 		assertFile("json_test.json").sameAsResource("json/sortByKeysAfterDisabled.json");
 	}
+
+	@Test
+	public void testFormatJson_WithGson_sortByKeys() throws Exception {
+		writePomWithJsonSteps("<gson><sortByKeys>true</sortByKeys></gson>");
+
+		setFile("json_test.json").toResource("json/sortByKeysBefore.json");
+		mavenRunner().withArguments("spotless:apply").runNoError().error();
+		assertFile("json_test.json").sameAsResource("json/sortByKeysAfter.json");
+	}
+
 }