stringAlgorithms/StringTests.java

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package stringAlgorithms;

import static org.junit.Assert.*;

import org.junit.Test;

public class StringTests {

    @Test
    public void testReverse() {
        String s1 = "abcdefgh";
        String s1Rev = "hgfedcba";
        String s2 = "abcdefghi";
        String s2Rev = "ihgfedcba";

        assertTrue("Failed to reverse " + s1,
                Algorithms.reverse(s1).equals(s1Rev));
        assertTrue("Failed to reverse " + s2,
                Algorithms.reverse(s2).equals(s2Rev));
    }

    @Test
    public void testisSubstring() {
        assertTrue("run should be a substring of running", Algorithms.isSubstring("run", "running"));
        assertTrue("read should be a substring of read", Algorithms.isSubstring("read", "read"));
        assertTrue("foo should be a substring of \"big foo deal\"", Algorithms.isSubstring("foo", "big foo deal"));
        assertTrue("read should be a substring of \"you can read\"", Algorithms.isSubstring("read", "you can read"));
        assertTrue("read should be a substring of \"she was reading\"", Algorithms.isSubstring("read", "she was reading"));
        assertFalse("rolling is not a substring of \"stone roll down\"", Algorithms.isSubstring("rolling", "stone roll down"));
    }
}