Add Play Mode Test to make katana happy.

TestProjects/LWRP/GraphicsTests/Assets/PlayModeTests.meta

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TestProjects/LWRP/GraphicsTests/Assets/PlayModeTests/NewTestScript.cs

+using UnityEngine;
+using UnityEngine.TestTools;
+using NUnit.Framework;
+using System.Collections;
+
+public class NewTestScript {
+
+    [Test]
+    public void NewTestScriptSimplePasses() {
+        // Use the Assert class to test conditions.
+    }
+
+    // A UnityTest behaves like a coroutine in PlayMode
+    // and allows you to yield null to skip a frame in EditMode
+    [UnityTest]
+    public IEnumerator NewTestScriptWithEnumeratorPasses() {
+        // Use the Assert class to test conditions.
+        // yield to skip a frame
+        yield return null;
+    }
+}

TestProjects/LWRP/GraphicsTests/Assets/PlayModeTests/NewTestScript.cs.meta

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TestProjects/LWRP/GraphicsTests/Assets/PlayModeTests/PlayModeTests.asmdef

+{
+    "name": "PlayModeTests",
+    "optionalUnityReferences": [
+        "TestAssemblies"
+    ]
+}

TestProjects/LWRP/GraphicsTests/Assets/PlayModeTests/PlayModeTests.asmdef.meta

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