JUnit : AssertionFailed on String Comparison

[Wilfried LAURENT]

Using JUnit, I have the following error message on string comparison:
junit.framework.AssertionFailedError: expected:<file:s1> but was:<file:s1>
Does anybody know why this happens? I have exactely the same test before with a different String and it passed.
W.

[Craig Demyanovich]

I need more than just the error message, as it doesn't remind me of anything that I've experienced or read. Please provide the test method (wrapped by CODE tags) if you can.
Craig

[Carl Parrish]

Which Assert are you using??

[Wilfried LAURENT]

I am using the assertEquals, not the assertSame.
After investigation, it is not JUnit fault .
The equals invokation on the object (taken from a domain-specific library) shows an erratic behavior. It returns sometimes "true", sometimes "false". I have to raise a bug report I think.
W.

[Craig Demyanovich]

Wilfried, you can write a unit test like this one to test the class in question:

    /**
     * Test overriding of equals().
     */
    public void testEquals()
    {
        Column col1 = new Column(java.sql.Types.INTEGER, "id", "INTEGER",
                                 null, 0, 0, false, 2);
        Column col2 = new Column(java.sql.Types.INTEGER, "id", "INTEGER",
                                 null, 0, 0, false, 2);
        Column col3 = new Column(java.sql.Types.INTEGER, "id", "INTEGER",
                                 null, 0, 0, false, 2);
        // reflexivity
        assertTrue("reflexivity violated in equals()", col1.equals(col1));
        // symmetry
        assertEquals("symmetry violated in equals()", col1.equals(col2),
                     col2.equals(col1));
        // transitivity
        assertTrue("transitivity violated in equals()",
                   col1.equals(col2) && col2.equals(col3) && col1.equals(col3));
        // consistency
        assertEquals("consistency violated in equals()", col1.equals(col3),
                     col1.equals(col3));
        // "non-nullity"
        assertTrue("'non-nullity' violated in equals()",
                   col1.equals(null) == false);
    }

Good luck,
Craig