Add changes note, Fix style

Author: blacelle

plugin-maven/CHANGES.md

@@ -7,6 +7,7 @@ We adhere to the [keepachangelog](https://keepachangelog.com/en/1.0.0/) format (
 ## [2.29.0] - 2023-01-02
 ### Added
 * Added support for M2E's incremental compilation ([#1414](https://github.com/diffplug/spotless/pull/1414) fixes [#1413](https://github.com/diffplug/spotless/issues/1413))
+* Add JSON support ([#1446](https://github.com/diffplug/spotless/pull/1446))
 ### Fixed
 * Improve memory usage when using git ratchet ([#1426](https://github.com/diffplug/spotless/pull/1426))
 * Support `ktlint` 0.48+ ([#1432](https://github.com/diffplug/spotless/pull/1432)) fixes ([#1430](https://github.com/diffplug/spotless/issues/1430))

plugin-maven/README.md

@@ -724,8 +724,8 @@ Uses a JSON pretty-printer that optionally allows configuring the number of spac
 
 ```xml
 <simple>
-	<indentSpaces>4</indentSpaces>    <!-- optional: specify the number of spaces to use -->
-</simple> 
+  <indentSpaces>4</indentSpaces>    <!-- optional: specify the number of spaces to use -->
+</simple>
 ```
 
 ### Gson
@@ -734,10 +734,10 @@ Uses Google Gson to also allow sorting by keys besides custom indentation - usef
 
 ```xml
 <gson>
-	<indentSpaces>4</indentSpaces>        <!-- optional: specify the number of spaces to use -->
-	<sortByKeys>false</sortByKeys>        <!-- optional: sort JSON by its keys -->
-	<escapeHtml>false</indentSpaces>      <!-- optional: escape HTML in values -->
-	<version>2.8.1</version>              <!-- optional: specify version -->
+  <indentSpaces>4</indentSpaces>        <!-- optional: specify the number of spaces to use -->
+  <sortByKeys>false</sortByKeys>        <!-- optional: sort JSON by its keys -->
+  <escapeHtml>false</indentSpaces>      <!-- optional: escape HTML in values -->
+  <version>2.8.1</version>              <!-- optional: specify version -->
 </gson>
 ```
 

plugin-maven/src/main/java/com/diffplug/spotless/maven/json/Json.java

@@ -25,7 +25,7 @@
  */
 public class Json extends FormatterFactory {
 	public static final int DEFAULT_INDENTATION = 4;
-	
+
 	@Override
 	public Set<String> defaultIncludes() {
 		return Collections.emptySet();

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

@@ -0,0 +1,40 @@
+/*
+ * Copyright 2023 DiffPlug
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.diffplug.spotless.maven.json;
+
+import org.junit.jupiter.api.Test;
+
+import com.diffplug.spotless.maven.MavenIntegrationHarness;
+
+public class JsonTest extends MavenIntegrationHarness {
+	@Test
+	public void testFormatJson_WithSimple_defaultConfig() throws Exception {
+		writePomWithPomSteps("<json><simple/></json>");
+
+		setFile("json_test.json").toResource("json/json_dirty.json");
+		mavenRunner().withArguments("spotless:apply").runNoError().error();
+		assertFile("json_test.json").sameAsResource("json/json_clean_default.json");
+	}
+
+	@Test
+	public void testFormatJson_WithGson_defaultConfig() throws Exception {
+		writePomWithPomSteps("<json><gson/></json>");
+
+		setFile("json_test.json").toResource("json/json_dirty.json");
+		mavenRunner().withArguments("spotless:apply").runNoError().error();
+		assertFile("json_test.json").sameAsResource("json/json_clean_default.json");
+	}
+}