pylucene 3.5.0-3

[pylucene.git] / lucene-java-3.5.0 / lucene / contrib / spellchecker / src / test / org / apache / lucene / search / spell / TestLevenshteinDistance.java

diff --git a/lucene-java-3.5.0/lucene/contrib/spellchecker/src/test/org/apache/lucene/search/spell/TestLevenshteinDistance.java b/lucene-java-3.5.0/lucene/contrib/spellchecker/src/test/org/apache/lucene/search/spell/TestLevenshteinDistance.java
new file mode 100644 (file)
index 0000000..1a54d37
--- /dev/null
+++ b/lucene-java-3.5.0/lucene/contrib/spellchecker/src/test/org/apache/lucene/search/spell/TestLevenshteinDistance.java
@@ -0,0 +1,54 @@
+package org.apache.lucene.search.spell;
+
+/**
+ * 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.
+ */
+
+import org.apache.lucene.util.LuceneTestCase;
+
+public class TestLevenshteinDistance extends LuceneTestCase {
+
+  private StringDistance sd = new LevensteinDistance();
+  
+  public void testGetDistance() {
+    float d = sd.getDistance("al", "al");
+    assertEquals(d,1.0f,0.001);
+    d = sd.getDistance("martha", "marhta");
+    assertEquals(d,0.6666,0.001);
+    d = sd.getDistance("jones", "johnson");
+    assertEquals(d,0.4285,0.001);
+    d = sd.getDistance("abcvwxyz", "cabvwxyz");
+    assertEquals(d,0.75,0.001);    
+    d = sd.getDistance("dwayne", "duane");
+    assertEquals(d,0.666,0.001);
+    d = sd.getDistance("dixon", "dicksonx");
+    assertEquals(d,0.5,0.001);
+    d = sd.getDistance("six", "ten");
+    assertEquals(d,0,0.001);
+    float d1 = sd.getDistance("zac ephron", "zac efron");
+    float d2 = sd.getDistance("zac ephron", "kai ephron");
+    assertEquals(d1,d2,0.001);
+    d1 = sd.getDistance("brittney spears", "britney spears");
+    d2 = sd.getDistance("brittney spears", "brittney startzman");
+    assertTrue(d1 > d2);
+  }
+  
+  public void testEmpty() throws Exception {
+    float d = sd.getDistance("", "al");
+    assertEquals(d,0.0f,0.001);
+  }
+
+}