1 package junit.framework;
4 * Thrown when an assert equals for Strings failed.
6 * Inspired by a patch from Alex Chaffee mailto:alex@purpletech.com
8 public class ComparisonFailure extends AssertionFailedError {
9 private String fExpected;
10 private String fActual;
13 * Constructs a comparison failure.
14 * @param message the identifying message or null
15 * @param expected the expected string value
16 * @param actual the actual string value
18 public ComparisonFailure (String message, String expected, String actual) {
25 * Returns "..." in place of common prefix and "..." in
26 * place of common suffix between expected and actual.
28 * @see java.lang.Throwable#getMessage()
30 public String getMessage() {
31 if (fExpected == null || fActual == null)
32 return Assert.format(super.getMessage(), fExpected, fActual);
34 int end= Math.min(fExpected.length(), fActual.length());
38 if (fExpected.charAt(i) != fActual.charAt(i))
41 int j= fExpected.length()-1;
42 int k= fActual.length()-1;
43 for (; k >= i && j >= i; k--,j--) {
44 if (fExpected.charAt(j) != fActual.charAt(k))
47 String actual, expected;
54 expected= fExpected.substring(i, j+1);
55 actual= fActual.substring(i, k+1);
56 if (i <= end && i > 0) {
57 expected= "..."+expected;
61 if (j < fExpected.length()-1)
62 expected= expected+"...";
63 if (k < fActual.length()-1)
66 return Assert.format(super.getMessage(), expected, actual);