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Test unit for Ratcliff-Obershelp algorithm

src/test/java/info/debatty/java/stringsimilarity/RatcliffObershelpTest.java

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+/*
+ * The MIT License
+ *
+ * Copyright 2015 Thibault Debatty.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+package info.debatty.java.stringsimilarity;
+
+import info.debatty.java.stringsimilarity.testutil.NullEmptyTests;
+import org.junit.Test;
+import static org.junit.Assert.*;
+
+/**
+ *
+ * @author Agung Nugroho
+ */
+public class RatcliffObershelpTest {
+
+
+    /**
+     * Test of similarity method, of class RatcliffObershelp.
+     */
+    @Test
+    public final void testSimilarity() {
+        System.out.println("similarity");
+        RatcliffObershelp instance = new RatcliffObershelp();
+        assertEquals(
+                0.888888,
+                instance.similarity("My string", "My tsring"),
+                0.000001);
+
+        assertEquals(
+                0.777778,
+                instance.similarity("My string", "My ntrisg"),
+                0.000001);
+
+        // test data from essay by Ilya Ilyankou
+        // "Comparison of Jaro-Winkler and Ratcliff/Obershelp algorithms
+        // in spell check"
+        // https://ilyankou.files.wordpress.com/2015/06/ib-extended-essay.pdf
+        // p13, expected result is 0.857
+        assertEquals(
+                0.857,
+                instance.similarity("MATEMATICA", "MATHEMATICS"),
+                0.001);
+
+        // these following test data were based on stringmetric 
+        // https://github.com/rockymadden/stringmetric
+        // expected output is 0.7368421052631579
+        assertEquals(
+                0.736842,
+                instance.similarity("aleksander", "alexandre"),
+                0.000001);
+
+        // expected output is 0.6666666666666666
+        assertEquals(
+                0.666666,
+                instance.similarity("pennsylvania", "pencilvaneya"),
+                0.000001);
+
+        // test data from wikipedia
+        // https://en.wikipedia.org/wiki/Gestalt_Pattern_Matching
+        // expected output is 14/18 = 0.7777777777777778‬
+        assertEquals(
+                0.777778,
+                instance.similarity("WIKIMEDIA", "WIKIMANIA"),
+                0.000001);
+
+        NullEmptyTests.testSimilarity(instance);
+    }
+
+    @Test
+    public final void testDistance() {
+        RatcliffObershelp instance = new RatcliffObershelp();
+        NullEmptyTests.testDistance(instance);
+
+        // TODO: regular (non-null/empty) distance tests
+    }
+}