/test/spelling/corrector/SpellingCorrectorHelperTest.java

package spelling.corrector;



import java.util.ArrayList;

import java.util.List;



import junit.framework.TestCase;



public abstract class SpellingCorrectorHelperTest extends

		TestCase {



	public final void testGetDeletions() {

		try {

			List<String> expected = new ArrayList<String>();

			expected.add("ase");

			expected.add("cse");

			expected.add("cae");

			expected.add("cas");

			List<String> result = getHelper().getDeletion("case");

			assertEquals(expected, result);

		} catch (Exception e) {

			fail(e.getMessage());

		}

	}



	public final void testGetTranspositions() {

		try {

			List<String> expected = new ArrayList<String>();

			expected.add("acse");

			expected.add("csae");

			expected.add("caes");

			List<String> result = getHelper().getTransposition("case");

			assertEquals(expected, result);

		} catch (Exception e) {

			fail(e.getMessage());

		}

	}



	public final void testGetAlterations() {

		try {

			List<String> expected = new ArrayList<String>();

			String word = "case";

			for (int i = 0; i < word.length(); i++) {

				for (char c = 'a'; c <= 'z'; c++) {

					expected.add(word.replace(word.charAt(i), c));

				}

			}

			List<String> result = getHelper().getAlterations("case");

			assertEquals(expected, result);

		} catch (Exception e) {

			fail(e.getMessage());

		}

	}



	public final void testGetInsertions() {

		try {

			List<String> expected = new ArrayList<String>();

			String word = "case";

			for (int i = 0; i < word.length() + 1; i++) {

				for (char c = 'a'; c <= 'z'; c++) {

					expected.add(word.substring(0, i) + c + word.substring(i));

				}

			}

			List<String> result = getHelper().getInsertions("case");

			assertEquals(expected, result);

		} catch (Exception e) {

			fail(e.getMessage());

		}

	}



	abstract protected SpellingCorrectorHelper getHelper();

}