Extract TitleUtil from NewTabPageView

chrome/android/junit/src/org/chromium/chrome/browser/ntp/TitleUtilTest.java

Index: chrome/android/junit/src/org/chromium/chrome/browser/ntp/TitleUtilTest.java
diff --git a/chrome/android/junit/src/org/chromium/chrome/browser/ntp/TitleUtilTest.java b/chrome/android/junit/src/org/chromium/chrome/browser/ntp/TitleUtilTest.java
new file mode 100644
index 0000000000000000000000000000000000000000..e27710a5f880d125fd5671225efdeafe2dcbb4f5
--- /dev/null
+++ b/chrome/android/junit/src/org/chromium/chrome/browser/ntp/TitleUtilTest.java
@@ -0,0 +1,44 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.chrome.browser.ntp;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNull;
+
+import org.chromium.base.test.util.Feature;
+import org.chromium.testing.local.LocalRobolectricTestRunner;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.robolectric.annotation.Config;
+
+/**
+ * Unit tests for TitleUtil.
+ */
+@RunWith(LocalRobolectricTestRunner.class)
+@Config(manifest = Config.NONE)
+public class TitleUtilTest {
+    /**
+     * Tests for the getTitleForDisplay method.
+     */
+    @Test
+    @Feature({"Ntp"})
+    public void testGetTitleForDisplay() throws Exception {
+        // If the title is not null or empty it is simply returned.
+        assertEquals("title", TitleUtil.getTitleForDisplay("title", "https://example.com/path"));
+        assertEquals("title", TitleUtil.getTitleForDisplay("title", ""));
+        assertEquals("title", TitleUtil.getTitleForDisplay("title", null));
+
+        // If the url is null or empty the title is simply returned.
+        assertNull(TitleUtil.getTitleForDisplay(null, null));
+        assertEquals("", TitleUtil.getTitleForDisplay("", null));
+
+        // If the title is null or empty but not the url, a shortened form of the url is returned.
+        assertEquals("example.com/foo/bar",
+                TitleUtil.getTitleForDisplay(null, "https://example.com/foo/bar"));
+        assertEquals("example.com", TitleUtil.getTitleForDisplay(null, "https://example.com/"));
+        assertEquals("foo/bar", TitleUtil.getTitleForDisplay(null, "foo/bar"));
+        assertEquals("", TitleUtil.getTitleForDisplay(null, "/"));
+    }
+}