Helper classes for java bindings.

mojo/android/javatests/src/org/chromium/mojo/bindings/BindingsHelperTest.java

Index: mojo/android/javatests/src/org/chromium/mojo/bindings/BindingsHelperTest.java
diff --git a/mojo/android/javatests/src/org/chromium/mojo/bindings/BindingsHelperTest.java b/mojo/android/javatests/src/org/chromium/mojo/bindings/BindingsHelperTest.java
new file mode 100644
index 0000000000000000000000000000000000000000..a46a15773155e0727f48f93d6c39b3589d877680
--- /dev/null
+++ b/mojo/android/javatests/src/org/chromium/mojo/bindings/BindingsHelperTest.java
@@ -0,0 +1,55 @@
+// Copyright 2014 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.mojo.bindings;
+
+import android.test.suitebuilder.annotation.SmallTest;
+
+import junit.framework.TestCase;
+
+import java.nio.charset.Charset;
+
+/**
+ * Testing {@link BindingsHelper}.
+ */
+public class BindingsHelperTest extends TestCase {
+
+    /**
+     * Testing {@link BindingsHelper#utf8StringSizeInBytes(String)}.
+     */
+    @SmallTest
+    public void testUTF8StringLength() {
+        String[] stringsToTest = {
+            "",
+            "a",
+            "hello world",
+            "éléphant",
+            "𠜎𠜱𠝹𠱓𠱸𠲖𠳏𠳕",
+            "你午饭想吃什么",
+            "你午饭想吃什么\0éléphant",
+        };
+        for (String s : stringsToTest) {
+            assertEquals(s.getBytes(Charset.forName("utf8")).length,
+                    BindingsHelper.utf8StringSizeInBytes(s));
+        }
+        assertEquals(1, BindingsHelper.utf8StringSizeInBytes("\0"));
+        String s = new StringBuilder().appendCodePoint(0x0).appendCodePoint(0x80).
+                appendCodePoint(0x800).appendCodePoint(0x10000).toString();
+        assertEquals(10, BindingsHelper.utf8StringSizeInBytes(s));
+        assertEquals(10, s.getBytes(Charset.forName("utf8")).length);
+    }
+
+    /**
+     * Testing {@link BindingsHelper#align(int)}.
+     */
+    @SmallTest
+    public void testAlign() {
+        for (int i = 0; i < 3 * BindingsHelper.ALIGNMENT; ++i) {
+            int j = BindingsHelper.align(i);
+            assertTrue(j >= i);
+            assertTrue(j % BindingsHelper.ALIGNMENT == 0);
+            assertTrue(j - i < BindingsHelper.ALIGNMENT);
+        }
+    }
+}