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Groovy example source code file (GroovyMainTest.groovy)

This example Groovy source code file (GroovyMainTest.groovy) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Groovy tags/keywords

bytearrayoutputstream, groovymaintest, groovymaintest, groovytestcase, printstream, printstream, string, string, version, version

The Groovy GroovyMainTest.groovy source code

package groovy.ui

class GroovyMainTest extends GroovyTestCase {
    private baos = new ByteArrayOutputStream()
    private ps = new PrintStream(baos)

    void testHelp() {
        String[] args = ['-h']
        GroovyMain.processArgs(args, ps)
        def out = baos.toString()
        assert out.contains('usage: groovy')
        ['-a', '-c', '-d', '-e', '-h', '-i', '-l', '-n', '-p', '-v'].each{
            assert out.contains(it)
        }
    }

    void testVersion() {
        String[] args = ['-v']
        GroovyMain.processArgs(args, ps)
        def out = baos.toString()
        assert out.contains('Groovy Version:')
        assert out.contains('JVM:')
    }

    void testNoArgs() {
        String[] args = []
        GroovyMain.processArgs(args, ps)
        def out = baos.toString()
        assert out.contains('error: neither -e or filename provided')
    }

    void testAttemptToRunJavaFile() {
        String[] args = ['abc.java']
        GroovyMain.processArgs(args, ps)
        def out = baos.toString()
        assert out.contains('error: error: cannot compile file with .java extension: abc.java')
    }

    /**
     * GROOVY-1512: Add support for begin() and end() methods when processing files by line with -a -ne
     */
    void testAandNEparametersWithBeginEndFunctions() {
        def originalErr = System.err
        System.setErr(ps)
        def tempFile = File.createTempFile("dummy", "txt")
        tempFile << "dummy text\n" * 10
        try {
            String[] args = ['-a', '-ne', 'def begin() { nb = 0 }; def end() { System.err.println nb }; nb++', tempFile.absolutePath]
            GroovyMain.main(args)
            def out = baos.toString()
            assert out.contains('10')
        } finally {
            tempFile.delete()
            System.setErr(originalErr)
        }
    }
}

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