added transaction test

Author: mpv1989

src/test/java/com/arangodb/ArangoDatabaseTest.java

@@ -798,6 +798,25 @@ public void transactionCollection() {
 		assertThat(result, is("hello world"));
 	}
 
+	@Test
+	public void transactionInsertJson() {
+		try {
+			db.createCollection(COLLECTION_NAME);
+			final TransactionOptions options = new TransactionOptions().params("{\"_key\":\"0\"}")
+					.writeCollections(COLLECTION_NAME);
+			//@formatter:off
+			db.transaction("function (params) { "
+							+ "var db = require('internal').db;"
+							+ "db." + COLLECTION_NAME + ".save(JSON.parse(params));"
+							+ "}", Void.class, options);
+			//@formatter:on
+			assertThat(db.collection(COLLECTION_NAME).count().getCount(), is(1L));
+			assertThat(db.collection(COLLECTION_NAME).getDocument("0", String.class), is(notNullValue()));
+		} finally {
+			db.collection(COLLECTION_NAME).drop();
+		}
+	}
+
 	@Test
 	public void transactionEmpty() {
 		db.transaction("function () {}", null, null);