Beginnings of data gathering

src/test/java/org/junit/tests/experimental/logging/LoggingTest.java

@@ -0,0 +1,113 @@
+package org.junit.tests.experimental.logging;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+import static org.junit.Assert.fail;
+import org.junit.Test;
+import org.junit.runner.Description;
+import org.junit.runner.JUnitCore;
+import org.junit.runner.Result;
+import org.junit.runner.notification.Failure;
+import org.junit.runner.notification.RunListener;
+
+//TODO log success/fail
+//TODO log class start/finish
+//TODO log timing of single tests
+
+public class LoggingTest {
+	public class TestLog {
+
+		private int runCount= 0;
+		private int failureCount= 0;
+
+		public int getRunCount() {
+			return runCount;
+		}
+
+		public void setRunCount(int count) {
+			runCount= count;
+		}
+
+		public int getFailureCount() {
+			return failureCount;
+		}
+
+		public void setFailureCount(int count) {
+			this.failureCount= count;
+		}
+
+	}
+
+	public class LoggingListener extends RunListener {
+		private StringBuffer writer= new StringBuffer();
+		@Override
+		public void testStarted(Description description) throws Exception {
+			writer.append("t");
+		}
+
+		@Override
+		public void testFailure(Failure failure) throws Exception {
+			writer.append("f");
+		}
+
+		public String getLogContents() {
+			return writer.toString();
+		}
+
+	}
+
+	public static class Example {
+		@Test public void uno() {}
+		@Test public void due() {}
+	}
+
+	@Test public void logSuccess() {
+		JUnitCore core= new JUnitCore();
+		LoggingListener listener=addLogging(core);
+		core.run(Example.class);
+		String log= listener.getLogContents();
+		TestLog result = parse(log);
+		assertEquals(2, result.getRunCount());
+		assertEquals(0, result.getFailureCount());
+		// some assertions
+	}
+
+	public static class FailingExample {
+		@Test public void uno() {}
+		@Test public void due() {
+			fail();
+		}
+	}
+
+	@Test public void logFailure() {
+		JUnitCore core= new JUnitCore();
+		LoggingListener listener=addLogging(core);
+		core.run(FailingExample.class);
+		String log= listener.getLogContents();
+		TestLog result = parse(log);
+		assertEquals(2, result.getRunCount());
+		assertEquals(1, result.getFailureCount());
+		// some assertions
+	}
+
+	private TestLog parse(String log) {
+		TestLog result= new TestLog();
+		result.setRunCount(count(log, 't'));
+		result.setFailureCount(count(log, 'f'));
+		return result;
+	}
+
+	private int count(String log, char pattern) {
+		int count= 0;
+		for (int i = 0; i < log.length(); i++)
+			if (log.charAt(i) == pattern)
+				count++;
+		return count;
+	}
+
+	private LoggingListener addLogging(JUnitCore core) {
+		LoggingListener listener= new LoggingListener();
+		core.addListener(listener);
+		return listener;
+	}
+}