package junit.textui;

import java.io.PrintStream;

import junit.framework.*;
import junit.textui.*;

/**
 * A command line based tool to run tests.
 * <pre>
 * java junit.textui.TestRunner [-wait] TestCaseClass
 * </pre>
 * TestRunner expects the name of a TestCase class as argument.
 * If this class defines a static <code>suite</code> method it
 * will be invoked and the returned test is run. Otherwise all
 * the methods starting with "test" having no arguments are run.
 * <p>
 * When the wait command line argument is given TestRunner
 * waits until the users types RETURN.
 * <p>
 * TestRunner prints a trace as the tests are executed followed by a
 * summary at the end.
 */
public class TestRunner extends BaseTestRunner {
    private ResultPrinter fPrinter = new ResultPrinter(System.out);

    /**
     * Constructs a TestRunner.
     */
    public TestRunner() {
    }

    /**
     * Creates the TestResult to be used for the test run.
     */
    protected TestResult createTestResult() {
        return new TestResult();
    }

    public TestResult doRun(Test suite) {
        TestResult result = createTestResult();
        result.addListener(fPrinter);
        long startTime = System.currentTimeMillis();
        suite.run(result);
        long endTime = System.currentTimeMillis();
        long runTime = endTime - startTime;
        fPrinter.print(result, runTime);
        return result;
    }

    /**
     * Starts a test run. Analyzes the command line arguments
     * and runs the given test suite.
     */
    protected TestResult start(String args[]) throws Exception {
        String testCase = args[0];
        try {
            Test suite = getTest(testCase);
            return doRun(suite);
        } catch (Exception e) {
            e.printStackTrace();
            throw e;
        }
    }

    public static void main(String args[]) {
        TestRunner aTestRunner = new TestRunner();
        try {
            TestResult r = aTestRunner.start(args);
        } catch (Exception e) {
        }
    }
}