F!! Added XStream JSON

Author: ScottBob

approvaltests-tests/src/test/java/org/approvaltests/JsonXstreamApprovalTest.java

@@ -0,0 +1,25 @@
+package org.approvaltests;
+
+import org.junit.jupiter.api.Test;
+
+import java.time.Instant;
+
+public class JsonXstreamApprovalTest
+{
+  @Test
+  public void testBasicFormatting()
+  {
+    Circular c = new Circular();
+    JsonXtreamApprovals.verifyAsJson(c);
+  }
+
+  public static class Circular {
+    Circular parent;
+    String label;
+
+    public Circular() {
+      this.parent = this;
+      this.label = "Label";
+    }
+  }
+}

approvaltests-tests/src/test/java/org/approvaltests/JsonXstreamApprovalTest.testBasicFormatting.approved.json

@@ -0,0 +1,6 @@
+{"org.approvaltests.JsonXstreamApprovalTest$Circular": {
+  "parent": {
+    "@reference": ".."
+  },
+  "label": "Label"
+}}

approvaltests/pom.xml

@@ -19,12 +19,29 @@
             <artifactId>approvaltests-util</artifactId>
             <version>${project.parent.version}</version>
         </dependency>
+        <dependency>
+            <groupId>org.apache.camel</groupId>
+            <artifactId>camel-xstream</artifactId>
+            <version>2.21.0</version>
+        </dependency>
         <dependency>
             <groupId>org.testng</groupId>
             <artifactId>testng</artifactId>
             <version>7.5</version>
             <optional>true</optional>
         </dependency>
+        <dependency>
+            <groupId>com.thoughtworks.xstream</groupId>
+            <artifactId>xstream</artifactId>
+            <version>1.4.19</version>
+            <optional>true</optional>
+        </dependency>
+        <dependency>
+            <groupId>org.codehaus.jettison</groupId>
+            <artifactId>jettison</artifactId>
+            <version>1.5.1</version>
+            <optional>true</optional>
+        </dependency>
         <dependency>
             <groupId>com.google.code.gson</groupId>
             <artifactId>gson</artifactId>

approvaltests/src/main/java/org/approvaltests/JsonXtreamApprovals.java

@@ -0,0 +1,28 @@
+package org.approvaltests;
+
+import com.thoughtworks.xstream.XStream;
+import com.thoughtworks.xstream.io.json.JettisonMappedXmlDriver;
+import com.thoughtworks.xstream.io.json.JsonHierarchicalStreamDriver;
+import com.thoughtworks.xstream.io.xml.PrettyPrintWriter;
+import org.approvaltests.core.Options;
+
+import java.io.BufferedOutputStream;
+import java.io.BufferedWriter;
+import java.io.StringWriter;
+
+public class JsonXtreamApprovals
+{
+  public static void verifyAsJson(Object o)
+  {
+    verifyAsJson(o, new Options());
+  }
+  public static void verifyAsJson(Object o, Options options)
+  {
+    Approvals.verify(asJson(o), options.forFile().withExtension(".json"));
+  }
+  public static String asJson(Object o)
+  {
+    XStream xstream = new XStream(new JsonHierarchicalStreamDriver()); 
+    return xstream.toXML(o);
+  }
+}