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+<!DOCTYPE HTML>
+<html>
+<!--
+Test that the ShortestPaths component properly renders a graph of the merged shortest paths.
+-->
+<head>
+    <meta charset="utf-8">
+    <title>Tree component test</title>
+    <script type="application/javascript" src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+    <link rel="stylesheet" type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css">
+
+    <script type="application/javascript"
+            src="chrome://devtools/content/shared/vendor/d3.js">
+    </script>
+    <script type="application/javascript"
+            src="chrome://devtools/content/shared/vendor/dagre-d3.js">
+    </script>
+</head>
+<body>
+    <!-- Give the container height so that the whole tree is rendered. -->
+    <div id="container" style="height: 900px;"></div>
+
+    <pre id="test">
+        <script src="head.js" type="application/javascript;version=1.8"></script>
+        <script type="application/javascript;version=1.8">
+         window.onload = Task.async(function* () {
+           try {
+             const container = document.getElementById("container");
+
+             yield renderComponent(ShortestPaths(TEST_SHORTEST_PATHS_PROPS), container);
+
+             let found1 = false;
+             let found2 = false;
+             let found3 = false;
+
+             let found1to2 = false;
+             let found1to3 = false;
+             let found2to3 = false;
+
+             const tspans = [...container.querySelectorAll("tspan")];
+             for (let el of tspans) {
+               const text = el.textContent.trim();
+               dumpn("tspan's text = " + text);
+
+               switch (text) {
+                 // Nodes
+
+                 case "other › SomeType @ 0x1": {
+                   ok(!found1, "Should only find node 1 once");
+                   found1 = true;
+                   break;
+                 }
+
+                 case "other › SomeType @ 0x2": {
+                   ok(!found2, "Should only find node 2 once");
+                   found2 = true;
+                   break;
+                 }
+
+                 case "other › SomeType @ 0x3": {
+                   ok(!found3, "Should only find node 3 once");
+                   found3 = true;
+                   break;
+                 }
+
+                 // Edges
+
+                 case "1->2": {
+                   ok(!found1to2, "Should only find edge 1->2 once");
+                   found1to2 = true;
+                   break;
+                 }
+
+                 case "1->3": {
+                   ok(!found1to3, "Should only find edge 1->3 once");
+                   found1to3 = true;
+                   break;
+                 }
+
+                 case "2->3": {
+                   ok(!found2to3, "Should only find edge 2->3 once");
+                   found2to3 = true;
+                   break;
+                 }
+
+                 // Unexpected
+
+                 default: {
+                   ok(false, `Unexpected tspan: ${text}`);
+                   break;
+                 }
+               }
+             }
+
+             ok(found1, "Should have rendered node 1");
+             ok(found2, "Should have rendered node 2");
+             ok(found3, "Should have rendered node 3");
+
+             ok(found1to2, "Should have rendered edge 1->2");
+             ok(found1to3, "Should have rendered edge 1->3");
+             ok(found2to3, "Should have rendered edge 2->3");
+
+           } catch(e) {
+             ok(false, "Got an error: " + DevToolsUtils.safeErrorString(e));
+           } finally {
+             SimpleTest.finish();
+           }
+         });
+        </script>
+    </pre>
+</body>
+</html>