Groovy example source code file (Groovy3749Bug.groovy)

This example Groovy source code file (Groovy3749Bug.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

error, error, groovy3749bug, groovy3749bug, groovytestcase, groovytestcase, runtimeexception, runtimeexception

The Groovy Groovy3749Bug.groovy source code

package groovy.bugs

class Groovy3749Bug extends GroovyTestCase {
    void testScriptsProvidingStaticMainMethod() {
        def scriptStr
        
        // test various signatures of main()
        scriptStr = """
            static main(args) {
                throw new RuntimeException('main called')
            }
        """
        verifyScriptRun(scriptStr, "RuntimeException")
        
        scriptStr = """
            static def main(args) {
                throw new RuntimeException('main called')
            }
        """
        verifyScriptRun(scriptStr, "RuntimeException")
        
        scriptStr = """
            static void main(args) {
                throw new RuntimeException('main called')
            }
        """
        verifyScriptRun(scriptStr, "RuntimeException")

        scriptStr = """
            static main(String[] args) {
                throw new RuntimeException('main called')
            }
        """
        verifyScriptRun(scriptStr, "RuntimeException")

        scriptStr = """
            static def main(String[] args) {
                throw new RuntimeException('main called')
            }
        """
        verifyScriptRun(scriptStr, "RuntimeException")

        scriptStr = """
            static void main(String[] args) {
                throw new RuntimeException('main called')
            }
        """
        verifyScriptRun(scriptStr, "RuntimeException")
        
        // if both main() and the loose statements are provided, then the loose statements should run and not main
        scriptStr = """
            static main(args) {
                throw new RuntimeException('main called')
            }
            throw new Error()
        """
        verifyScriptRun(scriptStr, "Error")
        
        assertScript """
            def main(args) {
                throw new RuntimeException('main called')
            }
        """
    }
    
    void verifyScriptRun(scriptText, expectedFailure) {
        try{
            assertScript(scriptText)
        }catch(Throwable ex) {
            assertTrue ex.class.name.contains(expectedFailure) 
        }
    }
}