1 files changed, 55 insertions, 0 deletions
diff --git a/guava-tests/test/com/google/common/collect/BstPathTest.java b/guava-tests/test/com/google/common/collect/BstPathTest.java
new file mode 100644
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+++ b/guava-tests/test/com/google/common/collect/BstPathTest.java
@@ -0,0 +1,55 @@
+/*
+ * Copyright (C) 2011 The Guava Authors
+ *
+ * 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.common.collect;
+
+import com.google.common.annotations.GwtCompatible;
+import com.google.common.collect.BstTesting.SimpleNode;
+
+import junit.framework.TestCase;
+
+/**
+ * Simple tests for {@code BstPath}.
+ *
+ * @author Louis Wasserman
+ */
+@GwtCompatible
+public class BstPathTest extends TestCase {
+  static class SimplePath extends BstPath<SimpleNode, SimplePath> {
+    private SimplePath(SimpleNode tip, SimplePath tail) {
+      super(tip, tail);
+    }
+  }
+
+  public void testTailAtRoot() {
+    SimpleNode root = new SimpleNode('a', null, null);
+    SimplePath rootPath = new SimplePath(root, null);
+    assertFalse(rootPath.hasPrefix());
+    assertNull(rootPath.prefixOrNull());
+    try {
+      rootPath.getPrefix();
+      fail("Expected IllegalStateException");
+    } catch (IllegalStateException expected) {}
+  }
+
+  public void testTailDown() {
+    SimpleNode node = new SimpleNode('a', null, null);
+    SimpleNode root = new SimpleNode('b', node, null);
+    SimplePath rootPath = new SimplePath(root, null);
+    SimplePath nodePath = new SimplePath(node, rootPath);
+    assertTrue(nodePath.hasPrefix());
+    assertEquals(rootPath, nodePath.prefixOrNull());
+    assertEquals(rootPath, nodePath.getPrefix());
+  }
+}