[tests] Add editor test with example tests for now

Tests.meta

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Tests/Runtime.meta

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Tests/Runtime/GraphVisualizerClientTests.cs

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+using NUnit.Framework;
+using System.Linq;
+using UnityEngine.Playables;
+
+class GraphVisualizerClientTest
+{
+    [TearDown]
+    public void TearDown()
+    {
+        // Clear graphs between tests, otherwise graphs are still referenced across tests.
+        GraphVisualizerClient.ClearGraphs();
+    }
+
+    private static PlayableGraph CreatePlayableGraph(string name)
+    {
+        var graph = PlayableGraph.Create(name);
+        ScriptPlayableOutput.Create(graph, "output");
+        return graph;
+    }
+
+    [Test]
+    public void CanShowGraph()
+    {
+        var graph1 = CreatePlayableGraph("test1");
+        var graph2 = CreatePlayableGraph("test2");
+
+        GraphVisualizerClient.Show(graph1);
+        var graphs = GraphVisualizerClient.GetGraphs().ToArray();
+
+        Assert.That(graphs.Length, Is.EqualTo(1));
+        Assert.That(graphs[0].GetEditorName(), Is.EqualTo(graph1.GetEditorName()));
+
+        GraphVisualizerClient.Show(graph2);
+        graphs = GraphVisualizerClient.GetGraphs().ToArray();
+
+        Assert.That(graphs.Length, Is.EqualTo(2));
+        Assert.That(graphs[0].GetEditorName(), Is.EqualTo(graph1.GetEditorName()));
+        Assert.That(graphs[1].GetEditorName(), Is.EqualTo(graph2.GetEditorName()));
+
+        graph1.Destroy();
+        graph2.Destroy();
+    }
+
+    [Test]
+    public void CannotShowSameGraphTwice()
+    {
+        var graph1 = CreatePlayableGraph("test1");
+
+        GraphVisualizerClient.Show(graph1);
+        var graphs = GraphVisualizerClient.GetGraphs().ToArray();
+
+        Assert.That(graphs.Length, Is.EqualTo(1));
+
+        graph1.Destroy();
+    }
+
+    [Test]
+    public void CanHideGraph()
+    {
+        var graph1 = CreatePlayableGraph("test1");
+        var graph2 = CreatePlayableGraph("test2");
+
+        GraphVisualizerClient.Show(graph1);
+        GraphVisualizerClient.Show(graph2);
+        var graphs = GraphVisualizerClient.GetGraphs().ToArray();
+
+        Assert.That(graphs.Length, Is.EqualTo(2));
+        Assert.That(graphs[0].GetEditorName(), Is.EqualTo(graph1.GetEditorName()));
+        Assert.That(graphs[1].GetEditorName(), Is.EqualTo(graph2.GetEditorName()));
+
+        GraphVisualizerClient.Hide(graph1);
+        graphs = GraphVisualizerClient.GetGraphs().ToArray();
+
+        Assert.That(graphs.Length, Is.EqualTo(1));
+        Assert.That(graphs[0].GetEditorName(), Is.EqualTo(graph2.GetEditorName()));
+
+        graph1.Destroy();
+        graph2.Destroy();
+    }
+
+    [Test]
+    public void CanClearGraphs()
+    {
+        var graph1 = CreatePlayableGraph("test1");
+        var graph2 = CreatePlayableGraph("test2");
+
+        GraphVisualizerClient.Show(graph1);
+        GraphVisualizerClient.Show(graph2);
+        var graphs = GraphVisualizerClient.GetGraphs().ToArray();
+
+        Assert.That(graphs.Length, Is.EqualTo(2));
+
+        GraphVisualizerClient.ClearGraphs();
+        graphs = GraphVisualizerClient.GetGraphs().ToArray();
+
+        Assert.That(graphs.Length, Is.EqualTo(0));
+
+        graph1.Destroy();
+        graph2.Destroy();
+    }
+}

Tests/Runtime/GraphVisualizerClientTests.cs.meta

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Tests/Runtime/Unity.PlayableGraphVisualizer.Tests.asmdef

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+{
+    "name": "Unity.PlayableGraphVisualizer.Tests",
+    "references": [
+        "Unity.PlayableGraphVisualizer"
+    ],
+    "optionalUnityReferences": [
+        "TestAssemblies"
+    ],
+    "includePlatforms": [],
+    "excludePlatforms": []
+}

Tests/Runtime/Unity.PlayableGraphVisualizer.Tests.asmdef.meta

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