1 files changed, 66 insertions, 0 deletions
diff --git a/javatests/com/android/loganalysis/util/LogTailUtilTest.java b/javatests/com/android/loganalysis/util/LogTailUtilTest.java
new file mode 100644
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--- /dev/null
+++ b/javatests/com/android/loganalysis/util/LogTailUtilTest.java
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+/*
+ * Copyright (C) 2013 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.loganalysis.util;
+
+import junit.framework.TestCase;
+
+/**
+ * Unit tests for {@link LogTailUtil}.
+ */
+public class LogTailUtilTest extends TestCase {
+
+    /**
+     * Test that last and id tails of the log are returned correctly.
+     */
+    public void testGetPreambles() {
+        LogTailUtil preambleUtil = new LogTailUtil(500, 3, 3);
+
+        assertEquals("", preambleUtil.getLastTail());
+        assertEquals("", preambleUtil.getIdTail(1));
+
+        preambleUtil.addLine(1, "line 1");
+        preambleUtil.addLine(2, "line 2");
+
+        assertEquals("line 1\nline 2", preambleUtil.getLastTail());
+        assertEquals("line 1", preambleUtil.getIdTail(1));
+
+        preambleUtil.addLine(1, "line 3");
+        preambleUtil.addLine(2, "line 4");
+        preambleUtil.addLine(1, "line 5");
+        preambleUtil.addLine(2, "line 6");
+        preambleUtil.addLine(1, "line 7");
+        preambleUtil.addLine(2, "line 8");
+
+        assertEquals("line 6\nline 7\nline 8", preambleUtil.getLastTail());
+        assertEquals("line 3\nline 5\nline 7", preambleUtil.getIdTail(1));
+    }
+
+    /**
+     * Test that the ring buffer is limited to a certain size.
+     */
+    public void testRingBufferSize() {
+        LogTailUtil preambleUtil = new LogTailUtil(5, 3, 3);
+        preambleUtil.addLine(1, "line 1");
+        preambleUtil.addLine(2, "line 2");
+        preambleUtil.addLine(2, "line 3");
+        preambleUtil.addLine(2, "line 4");
+        preambleUtil.addLine(2, "line 5");
+        preambleUtil.addLine(2, "line 6");
+
+        // The first line should roll off the end of the buffer.
+        assertEquals("", preambleUtil.getIdTail(1));
+    }
+}