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diff --git a/javatests/com/google/gerrit/httpd/raw/IndexServletTest.java b/javatests/com/google/gerrit/httpd/raw/IndexServletTest.java
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+++ b/javatests/com/google/gerrit/httpd/raw/IndexServletTest.java
@@ -0,0 +1,88 @@
+// Copyright (C) 2017 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.gerrit.httpd.raw;
+
+import static com.google.common.truth.Truth.assertThat;
+import static java.nio.charset.StandardCharsets.UTF_8;
+
+import com.google.template.soy.data.SoyMapData;
+import java.net.URISyntaxException;
+import org.junit.Test;
+
+public class IndexServletTest {
+  static class TestIndexServlet extends IndexServlet {
+    private static final long serialVersionUID = 1L;
+
+    TestIndexServlet(String canonicalURL, String cdnPath, String faviconPath)
+        throws URISyntaxException {
+      super(canonicalURL, cdnPath, faviconPath);
+    }
+
+    String getIndexSource() {
+      return new String(indexSource, UTF_8);
+    }
+  }
+
+  @Test
+  public void noPathAndNoCDN() throws URISyntaxException {
+    SoyMapData data = IndexServlet.getTemplateData("http://example.com/", null, null);
+    assertThat(data.getSingle("canonicalPath").stringValue()).isEqualTo("");
+    assertThat(data.getSingle("staticResourcePath").stringValue()).isEqualTo("");
+  }
+
+  @Test
+  public void pathAndNoCDN() throws URISyntaxException {
+    SoyMapData data = IndexServlet.getTemplateData("http://example.com/gerrit/", null, null);
+    assertThat(data.getSingle("canonicalPath").stringValue()).isEqualTo("/gerrit");
+    assertThat(data.getSingle("staticResourcePath").stringValue()).isEqualTo("/gerrit");
+  }
+
+  @Test
+  public void noPathAndCDN() throws URISyntaxException {
+    SoyMapData data =
+        IndexServlet.getTemplateData("http://example.com/", "http://my-cdn.com/foo/bar/", null);
+    assertThat(data.getSingle("canonicalPath").stringValue()).isEqualTo("");
+    assertThat(data.getSingle("staticResourcePath").stringValue())
+        .isEqualTo("http://my-cdn.com/foo/bar/");
+  }
+
+  @Test
+  public void pathAndCDN() throws URISyntaxException {
+    SoyMapData data =
+        IndexServlet.getTemplateData(
+            "http://example.com/gerrit", "http://my-cdn.com/foo/bar/", null);
+    assertThat(data.getSingle("canonicalPath").stringValue()).isEqualTo("/gerrit");
+    assertThat(data.getSingle("staticResourcePath").stringValue())
+        .isEqualTo("http://my-cdn.com/foo/bar/");
+  }
+
+  @Test
+  public void renderTemplate() throws URISyntaxException {
+    String testCanonicalUrl = "foo-url";
+    String testCdnPath = "bar-cdn";
+    String testFaviconURL = "zaz-url";
+    TestIndexServlet servlet = new TestIndexServlet(testCanonicalUrl, testCdnPath, testFaviconURL);
+    String output = servlet.getIndexSource();
+    assertThat(output).contains("<!DOCTYPE html>");
+    assertThat(output).contains("window.CANONICAL_PATH = '" + testCanonicalUrl);
+    assertThat(output).contains("<link rel=\"preload\" href=\"" + testCdnPath);
+    assertThat(output)
+        .contains(
+            "<link rel=\"icon\" type=\"image/x-icon\" href=\""
+                + testCanonicalUrl
+                + "/"
+                + testFaviconURL);
+  }
+}