LUCENE-1466: add unit test for CharFilter

git-svn-id: https://svn.apache.org/repos/asf/lucene/java/trunk@787946 13f79535-47bb-0310-9956-ffa450edef68

src/test/org/apache/lucene/analysis/TestCharFilter.java

@@ -0,0 +1,67 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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 org.apache.lucene.analysis;
+
+import java.io.StringReader;
+
+import junit.framework.TestCase;
+
+public class TestCharFilter extends TestCase {
+
+  public void testCharFilter1() throws Exception {
+    CharStream cs = new CharFilter1( CharReader.get( new StringReader("") ) );
+    assertEquals( "corrected offset is invalid", 1, cs.correctOffset( 0 ) );
+  }
+
+  public void testCharFilter2() throws Exception {
+    CharStream cs = new CharFilter2( CharReader.get( new StringReader("") ) );
+    assertEquals( "corrected offset is invalid", 2, cs.correctOffset( 0 ) );
+  }
+
+  public void testCharFilter12() throws Exception {
+    CharStream cs = new CharFilter2( new CharFilter1( CharReader.get( new StringReader("") ) ) );
+    assertEquals( "corrected offset is invalid", 3, cs.correctOffset( 0 ) );
+  }
+
+  public void testCharFilter11() throws Exception {
+    CharStream cs = new CharFilter1( new CharFilter1( CharReader.get( new StringReader("") ) ) );
+    assertEquals( "corrected offset is invalid", 2, cs.correctOffset( 0 ) );
+  }
+
+  static class CharFilter1 extends CharFilter {
+
+    protected CharFilter1(CharStream in) {
+      super(in);
+    }
+
+    protected int correct(int currentOff) {
+      return currentOff + 1;
+    }
+  }
+
+  static class CharFilter2 extends CharFilter {
+
+    protected CharFilter2(CharStream in) {
+      super(in);
+    }
+
+    protected int correct(int currentOff) {
+      return currentOff + 2;
+    }
+  }
+}