1 files changed, 84 insertions, 0 deletions
diff --git a/tests/src/com/android/providers/contacts/util/CappedStringBuilderTest.java b/tests/src/com/android/providers/contacts/util/CappedStringBuilderTest.java
new file mode 100644
index 00000000..d49b2630
--- /dev/null
+++ b/tests/src/com/android/providers/contacts/util/CappedStringBuilderTest.java
@@ -0,0 +1,84 @@
+/*
+ * Copyright (C) 2018 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.android.providers.contacts.util;
+
+import android.test.suitebuilder.annotation.SmallTest;
+
+import junit.framework.TestCase;
+
+/**
+ * Run with:
+ atest /android/pi-dev/packages/providers/ContactsProvider/tests/src/com/android/providers/contacts/util/CappedStringBuilderTest.java
+ */
+@SmallTest
+public class CappedStringBuilderTest extends TestCase {
+    public void testCappedChar() {
+        CappedStringBuilder csb = new CappedStringBuilder(8);
+
+        csb.append("abcd");
+        csb.append("efgh");
+
+        csb.append('x');
+        assertEquals("abcdefgh", csb.toString());
+
+        csb.append("y");
+        csb.append("yz");
+
+        assertEquals("abcdefgh", csb.toString());
+    }
+
+    public void testCappedString() {
+        CappedStringBuilder csb = new CappedStringBuilder(8);
+
+        csb.append("abcd");
+        csb.append("efgh");
+
+        csb.append("x");
+        assertEquals("abcdefgh", csb.toString());
+    }
+
+    public void testClear() {
+        CappedStringBuilder csb = new CappedStringBuilder(8);
+
+        csb.append("abcd");
+        csb.append("efgh");
+
+        csb.append("x");
+
+        assertEquals("abcdefgh", csb.toString());
+
+        csb.clear();
+
+        assertEquals("", csb.toString());
+
+        csb.append("abcd");
+        assertEquals("abcd", csb.toString());
+    }
+
+    public void testAlreadyCapped() {
+        CappedStringBuilder csb = new CappedStringBuilder(4);
+
+        csb.append("abc");
+
+        csb.append("xy");
+
+        // Once capped, further append() will all be blocked.
+        csb.append('z');
+        csb.append("z");
+
+        assertEquals("abc", csb.toString());
+    }
+}