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Groovy example source code file (TestGenerator.groovy)

This example Groovy source code file (TestGenerator.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

assertionfailederror, fail, failparse, io, list, list, object, pass, pass, string, string, stringbuffer, testfailure, testresult, testresult

The Groovy TestGenerator.groovy source code

/**
 * This will take a groovy test file and turn it into a Java TestCase
 * @author Jeremy Rayner
 */
package org.codehaus.groovy.tck
import java.io.*;
class TestGenerator{
    public String generate(realOutputPath, targetDir, srcName,srcText) {
//        System.out.println('single \\\\')
//        System.out.println("double \\\\")
        srcText = srcText.replaceAll('\\\\','\\\\\\\\') // need to escape a slash with slash slash

        def resultWriter = new StringWriter()
        def result = new PrintWriter(resultWriter)

        def fileName = srcName
        def fileStem = fileName.tokenize(".")[0]

        def comments = scrape(srcText," * ",".") // Take the first javadoc sentence, if it exists, for use as method name
        if (comments == null || comments[0] == null) {comments = [""]}
        def behaviourDescription = comments[0].trim()

        if ("" != realOutputPath) {
            def realOutputPackage = ''
            if (File.separator != '\\')
                realOutputPackage = realOutputPath.replaceAll(File.separator,'.')
            else
                realOutputPackage = realOutputPath.replaceAll('\\\\','.')
            result.println("package ${realOutputPackage};")
        }
        result.println("import junit.framework.*;")
        result.println("import org.codehaus.groovy.tck.*;")

        result.println("public class ${fileStem}Test extends TestCase {")

        //methodName = turnSentenceIntoJavaName(behaviourDescription)
        def methodName = ""
        methodName = "test${methodName}"

        // test for the source 'as is'
        printCommonTestMethodStart(result, "${methodName}Pass",srcText)
        result.println('        Object result = helper.evaluate(srcBuffer.toString(),"' + "${methodName}Pass" + '");')
        result.println('        if (result instanceof TestResult) {')
        result.println('            TestResult testResult = (TestResult)result;')
        result.println('            if (testResult.errorCount() > 0) {')
        result.println('                TestFailure firstTestFailure = (TestFailure)testResult.errors().nextElement();')
        result.println('                throw firstTestFailure.thrownException();')
        result.println('            }')
        result.println('            if (testResult.failureCount() > 0) {')
        result.println('                AssertionFailedError firstFailure = (AssertionFailedError)(testResult.failures().nextElement());')
        result.println('                throw firstFailure;')
        result.println('            }')
        result.println('        }')
        result.println("    }")

        // test for each of the '@pass' alternatives
        def passAlternatives = generateAlternatives(srcText,"@pass")

        passAlternatives.eachWithIndex{anAlternative,i ->
            printCommonTestMethodStart(result, "${methodName}Pass${i+1}",anAlternative[0]);
            result.println('        Object result = helper.evaluate(srcBuffer.toString(),"' + "${methodName}Pass${i+1}" + '");')
            result.println('        if (result instanceof TestResult) {')
            result.println('            TestResult testResult = (TestResult)result;')
            result.println('            if (testResult.errorCount() > 0) {')
            result.println('                TestFailure firstTestFailure = (TestFailure)testResult.errors().nextElement();')
            result.println('                throw firstTestFailure.thrownException();')
            result.println('            }')
            result.println('            if (testResult.failureCount() > 0) {')
            result.println('                AssertionFailedError firstFailure = (AssertionFailedError)(testResult.failures().nextElement());')
            result.println('                throw firstFailure;')
            result.println('            }')
            result.println('        }')

            result.println("    }")
        }

        // test for each of the '@fail:parse' alternatives
        def failureToParseAlternatives = generateAlternatives(srcText,"@fail:parse")
        failureToParseAlternatives.eachWithIndex{anAlternative,i ->
            printCommonTestMethodStart(result, "${methodName}FailParse${i+1}",anAlternative[0]);
            result.println("        try {")
            result.println('            helper.parse(srcBuffer.toString(),"' + "${methodName}FailParse${i+1}" + '");')


            result.println('            fail("This line did not fail to parse: ' + anAlternative[1] + '");')
            result.println("        } catch (Exception e) {")
            result.println("            // ignore an exception as that is what we're hoping for in this case.")
            result.println("        }")
            result.println("    }")
        }

        // test for each of the '@fail' alternatives, i.e. without being followed by a colon
        def failureAlternatives = generateAlternatives(srcText,"@fail(?!:)")
        failureAlternatives.eachWithIndex{anAlternative,i ->
            printCommonTestMethodStart(result, "${methodName}Fail${i+1}",anAlternative[0]);
            result.println("        try {")
            result.println('            helper.evaluate(srcBuffer.toString(),"' + "${methodName}Fail${i+1}" + '");')
            result.println('            fail("This line did not fail to evaluate: ' + anAlternative[1] + '");')
            result.println("        } catch (Exception e) {")
            result.println("            // ignore an exception as that is what we're hoping for in this case.")
            result.println("        }")
            result.println("    }")
        }
        result.println('    protected String lineSep = System.getProperty("line.separator");')
        result.println('    protected TestGeneratorHelper helper = new ClassicGroovyTestGeneratorHelper();')
        result.println("}")

        return resultWriter.toString()
    }


    // -- useful stuff

    /**
     * Creates alternative versions of the given source, one for each end of line comment tag e.g. //@fail
     * will remove the double slash from the start of each of the matching line.
     * e.g. src text of...
     * <pre>
     *     // a = 1 // @fail
     *     // b = 2 // @fail
     * </pre>
     * will return
     * <pre>
     * [ "a = 1 // @fail NLS // b = 2 // @fail",
     *   "// a = 1 // @fail NLS b = 2 // @fail" ]
     * </pre>
     *
     */
    List generateAlternatives(String srcText, String tag) {
        def alternatives = []
        def m = java.util.regex.Pattern.compile("//(.*?//\\s*" + tag + "\\S*)\\s").matcher(srcText)
        while (m.find()) {
            def foundText = m.group(1)
            def uncommentedSrcText = (srcText.substring(0,m.start()) + "  " + srcText.substring(m.start() + 2))
            alternatives << [uncommentedSrcText, foundText.replaceAll('"', '\\\\"')]
        }
        return alternatives
    }


    /**
     * Common setup code for each test method
     */
    void printCommonTestMethodStart(result, fullMethodName,someSrcText) {
        def buffer = new java.io.StringReader(someSrcText)

        result.println("    public void ${fullMethodName}() throws Throwable {")
        result.println("        StringBuffer srcBuffer = new StringBuffer();")

        // append each line to the buffer
        buffer.eachLine {line ->
            // escape double quotes
            line = line.replaceAll('"','\\\\"')
            result.println ('        srcBuffer.append("' + line + '").append(lineSep);')
        }
    }

    /**
     * Converts the given sentence into a Java style name like TheQuickBrownFox
     */
    String turnSentenceIntoJavaName(String sentence) {
        //uppercase each word and remove spaces to give camel case
        def tokens = sentence.tokenize(" ,;");
        def methodName = ""
        for (t in tokens) {
            if (t.size() > 1) {
                methodName += ( t[0].toUpperCase() + t[1..<t.size()].toLowerCase() )
            } else if (t.size() == 1) {
                methodName += t[0].toUpperCase()
            }
        }

        //remove nonalphanumeric characters
        methodName = methodName.replaceAll("[^A-Za-z0-9]","")

        return methodName
    }

    /**
     * Fetches a list of all the occurances of text between a string delimiter.
     */
    List scrape(String txt, String tag) {
        return scrape(txt,tag,tag)
    }

    /**
     * Fetches a list of all the occurances of text between two string delimiters (tags).
     */
    List scrape(String txt, String openTag, String closeTag) {
        def i = 0; def j = 0; def k = 0;
        def contents = []
        if (txt != null) {
            while (i> -1 && k > -1) {
              i = txt.indexOf(openTag,k)
                if (i > -1) {
                  j = i + openTag.length()
                    if (j > -1) {
                      k = txt.indexOf(closeTag,j)
                        if (k > -1) {
                          contents << txt.substring(j,k)
                        }
                    }
                }
            }
        }
        return contents
    }

}

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