isequaltest.java

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/*  Copyright (c) 2000-2004 jMock.org
 */
package test.jmock.core.constraint;

import org.jmock.core.Constraint;
import org.jmock.core.constraint.IsEqual;


public class IsEqualTest extends AbstractConstraintsTest
{
    public void testComparesObjectsUsingEqualsMethod() {
        Integer i1 = new Integer(1);
        Integer i2 = new Integer(2);
        Constraint c = new IsEqual(i1);

        assertTrue(c.eval(i1));
        assertTrue(c.eval(new Integer(1)));
        assertTrue(!c.eval(i2));
    }

    public void testCanCompareNullValues() {
        Integer i1 = new Integer(1);
        Constraint c = new IsEqual(i1);

        assertTrue(!c.eval(null));
        Constraint nullEquals = new IsEqual(null);
        assertTrue(nullEquals.eval(null));
        assertTrue(!nullEquals.eval(i1));
    }

    public void testComparesTheElementsOfAnObjectArray() {
        String[] s1 = new String[]{"a", "b"};
        String[] s2 = new String[]{"a", "b"};
        String[] s3 = new String[]{"c", "d"};
        String[] s4 = new String[]{"a", "b", "c", "d"};

        Constraint c = new IsEqual(s1);

        assertTrue("Should equal itself", c.eval(s1));
        assertTrue("Should equal a similar array", c.eval(s2));
        assertTrue("Should not equal a different array", !c.eval(s3));
        assertTrue("Should not equal a different sized array", !c.eval(s4));
    }

    public void testComparesTheElementsOfAnArrayOfPrimitiveTypes() {
        int[] i1 = new int[]{1, 2};
        int[] i2 = new int[]{1, 2};
        int[] i3 = new int[]{3, 4};
        int[] i4 = new int[]{1, 2, 3, 4};

        Constraint c = new IsEqual(i1);

        assertTrue("Should equal itself", c.eval(i1));
        assertTrue("Should equal a similar array", c.eval(i2));
        assertTrue("Should not equal a different array", !c.eval(i3));
        assertTrue("Should not equal a different sized array", !c.eval(i4));
    }

    public void testRecursivelyTestsElementsOfArrays() {
        int[][] i1 = new int[][]{{1, 2}, {3, 4}};
        int[][] i2 = new int[][]{{1, 2}, {3, 4}};
        int[][] i3 = new int[][]{{5, 6}, {7, 8}};
        int[] i4 = new int[]{1, 2, 3, 4};
        int[][] i5 = new int[][]{{1, 2, 3, 4}, {3, 4}};

        Constraint c = new IsEqual(i1);

        assertTrue("Should equal itself", c.eval(i1));
        assertTrue("Should equal a similar array", c.eval(i2));
        assertTrue("Should not equal a different array", !c.eval(i3));
        assertTrue("Should not equal a different sized array", !c.eval(i4));
        assertTrue("Should not equal a different sized subarray", !c.eval(i5));
    }

    public void testIncludesTheResultOfCallingToStringOnItsArgumentInTheDescription() {
        final String argumentDescription = "ARGUMENT DESCRIPTION";
        Object argument = new Object()
        {
            public String toString() {
                return argumentDescription;
            }
        };
        Constraint c = new IsEqual(argument);

        assertTrue("should contain argument's toString in toString result",
                   c.describeTo(new StringBuffer()).toString().indexOf(argumentDescription) >= 0);
    }

    public void testReturnsAnObviousDescriptionIfCreatedWithANestedConstraintByMistake() {
        IsEqual innerConstraint = new IsEqual("NestedConstraint");
        assertEquals("should get an obvious description to reflect nesting if viewed in a debugger",
                     "eq(<" + innerConstraint.toString() + ">)",
                     (new IsEqual(innerConstraint)).describeTo(new StringBuffer()).toString());
    }

    public void testReturnsGoodDescriptionIfCreatedWithNullReference() {
        assertEquals("should get a description even if argument is null",
                     "eq(null)",
                     new IsEqual(null).describeTo(new StringBuffer()).toString());
    }
}