Java unit test with JUnit vs groovy's power assert.

groovy-log

% ln -s MyTest.java MyTest.groovy
% groovy MyTest.groovy
.E.E
Time: 0.416
There were 2 errors:
1) testMin(MyTest)Assertion failed: 

assert Math.min(a, b) == b
            |   |  |  |  |
            1   1  2  |  2
                      false

	at org.codehaus.groovy.runtime.InvokerHelper.assertFailed(InvokerHelper.java:386)
	at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.assertFailed(ScriptBytecodeAdapter.java:658)
	at MyTest.testMin(MyTest.java:14)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:90)
	at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:233)
	at groovy.lang.MetaClassImpl.invokeStaticMethod(MetaClassImpl.java:1280)
	at org.codehaus.groovy.runtime.InvokerHelper.invokeStaticMethod(InvokerHelper.java:819)
	at org.codehaus.groovy.runtime.InvokerHelper.invokeStaticMethod(InvokerHelper.java:65)
	at groovy.lang.GroovyShell.runJUnit3Test(GroovyShell.java:351)
	at groovy.lang.GroovyShell.runScriptOrMainOrTestOrRunnable(GroovyShell.java:281)
	at groovy.lang.GroovyShell.run(GroovyShell.java:229)
	at groovy.lang.GroovyShell.run(GroovyShell.java:159)
	at groovy.ui.GroovyMain.processOnce(GroovyMain.java:550)
	at groovy.ui.GroovyMain.run(GroovyMain.java:337)
	at groovy.ui.GroovyMain.process(GroovyMain.java:323)
	at groovy.ui.GroovyMain.processArgs(GroovyMain.java:120)
	at groovy.ui.GroovyMain.main(GroovyMain.java:100)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at org.codehaus.groovy.tools.GroovyStarter.rootLoader(GroovyStarter.java:108)
	at org.codehaus.groovy.tools.GroovyStarter.main(GroovyStarter.java:130)
2) testSwap(MyTest)Assertion failed: 

assert a == 1 && b == 2
       | |    |
       2 |    false
         false

	at org.codehaus.groovy.runtime.InvokerHelper.assertFailed(InvokerHelper.java:386)
	at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.assertFailed(ScriptBytecodeAdapter.java:658)
	at MyTest.testSwap(MyTest.java:22)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:90)
	at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:233)
	at groovy.lang.MetaClassImpl.invokeStaticMethod(MetaClassImpl.java:1280)
	at org.codehaus.groovy.runtime.InvokerHelper.invokeStaticMethod(InvokerHelper.java:819)
	at org.codehaus.groovy.runtime.InvokerHelper.invokeStaticMethod(InvokerHelper.java:65)
	at groovy.lang.GroovyShell.runJUnit3Test(GroovyShell.java:351)
	at groovy.lang.GroovyShell.runScriptOrMainOrTestOrRunnable(GroovyShell.java:281)
	at groovy.lang.GroovyShell.run(GroovyShell.java:229)
	at groovy.lang.GroovyShell.run(GroovyShell.java:159)
	at groovy.ui.GroovyMain.processOnce(GroovyMain.java:550)
	at groovy.ui.GroovyMain.run(GroovyMain.java:337)
	at groovy.ui.GroovyMain.process(GroovyMain.java:323)
	at groovy.ui.GroovyMain.processArgs(GroovyMain.java:120)
	at groovy.ui.GroovyMain.main(GroovyMain.java:100)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at org.codehaus.groovy.tools.GroovyStarter.rootLoader(GroovyStarter.java:108)
	at org.codehaus.groovy.tools.GroovyStarter.main(GroovyStarter.java:130)

FAILURES!!!
Tests run: 2,  Failures: 0,  Errors: 2

% 

java-log

% javac -cp junit.jar:. MyTest.java
% java -ea -cp junit.jar:. junit.textui.TestRunner MyTest
.E.E
Time: 0.008
There were 2 errors:
1) testMin(MyTest)java.lang.AssertionError
	at MyTest.testMin(MyTest.java:14)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
2) testSwap(MyTest)java.lang.AssertionError
	at MyTest.testSwap(MyTest.java:22)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

FAILURES!!!
Tests run: 2,  Failures: 0,  Errors: 2

% 

MyTest.java

import junit.framework.TestCase;

public class MyTest extends TestCase {
    private int a, b;

    @Override
    public void setUp() {
        a = 1;
        b = 2;
    }

    public void testMin() {
        assert Math.min(a, b) == a;     // OK
        assert Math.min(a, b) == b;     // NG
    }

    public void testSwap() {
        a ^= b;
        b ^= a;
        a ^= b;
        assert a == 2 && b == 1;        // OK
        assert a == 1 && b == 2;        // NG
    }
}