1 files changed, 19 insertions, 0 deletions
diff --git a/shared/src/test/scala/FormatTests.scala b/shared/src/test/scala/FormatTests.scala
new file mode 100644
index 0000000..0f56091
--- /dev/null
+++ b/shared/src/test/scala/FormatTests.scala
@@ -0,0 +1,19 @@
+package spray.json
+
+import org.scalatest._
+
+trait FormatTests { self: FlatSpec =>
+
+  def checkRoundtrip[A: RootJsonFormat](a: A, expectedJson: String) = {
+    it should "serialize to the expected JSON value" in {
+      val expected: JsValue = expectedJson.parseJson
+      assert(a.toJson == expected)
+    }
+
+    it should "serialize then deserialize back to itself" in {
+      val reread = a.toJson.convertTo[A]
+      assert(reread == a)
+    }
+  }
+
+}