content: /*******************************************************************************
   * Copyright (c) 2009, 2019 Mountainminds GmbH & Co. KG and Contributors
   * All rights reserved. This program and the accompanying materials
   * are made available under the terms of the Eclipse Public License v1.0
   * which accompanies this distribution, and is available at
   * http://www.eclipse.org/legal/epl-v10.html
   *
   * Contributors:
   *    Marc R. Hoffmann - initial API and implementation
   *    
   *******************************************************************************/
  package org.jacoco.core.test.validation.java5;
  
  import static org.jacoco.core.test.validation.targets.Stubs.nop;
  import static org.junit.Assert.assertEquals;
  
  import java.io.IOException;
  import java.util.Collection;
  
  import org.jacoco.core.analysis.Analyzer;
  import org.jacoco.core.analysis.CoverageBuilder;
  import org.jacoco.core.analysis.IClassCoverage;
  import org.jacoco.core.analysis.ICounter;
  import org.jacoco.core.analysis.IMethodCoverage;
  import org.jacoco.core.data.ExecutionDataStore;
  import org.jacoco.core.data.SessionInfoStore;
  import org.jacoco.core.instr.Instrumenter;
  import org.jacoco.core.internal.analysis.CounterImpl;
  import org.jacoco.core.runtime.IRuntime;
  import org.jacoco.core.runtime.RuntimeData;
  import org.jacoco.core.runtime.SystemPropertiesRuntime;
  import org.jacoco.core.test.TargetLoader;
  import org.junit.After;
  import org.junit.Before;
  import org.junit.Test;
  
  /**
   * Various tests for cyclomatic complexity of methods.
   */
  public class CyclomaticComplexityTest {
  
  	public interface Target {
  		public void test(int arg);
  	}
  
  	private RuntimeData data;
  	private IRuntime runtime;
  	private byte[] bytes;
  	private Target target;
  
  	@Before
  	public void setup() throws Exception {
  		data = new RuntimeData();
  		runtime = new SystemPropertiesRuntime();
  		runtime.startup(data);
  	}
  
  	@After
  	public void teardown() {
  		runtime.shutdown();
  	}
  
  	public static class Simple implements Target {
  		public void test(int arg) {
  			nop();
  			nop();
  			nop();
  		}
  	}
  
  	@Test
  	public void testSimple1() throws Exception {
  		instrument(Simple.class);
  		final ICounter complexity = analyze();
  		assertEquals(CounterImpl.getInstance(1, 0), complexity);
  	}
  
  	@Test
  	public void testSimple2() throws Exception {
  		instrument(Simple.class);
  		target.test(0);
  		final ICounter complexity = analyze();
  		assertEquals(CounterImpl.getInstance(0, 1), complexity);
  	}
  
  	public static class If implements Target {
  		public void test(int arg) {
  			if (arg == 0) {
  				nop();
  			}
  		}
  	}
  
  	@Test
  	public void testIf1() throws Exception {
  		instrument(If.class);
  		final ICounter complexity = analyze();
  		assertEquals(CounterImpl.getInstance(2, 0), complexity);
  	}
  
  	@Test
  	public void testIf2() throws Exception {
  		instrument(If.class);
  		target.test(0);
  		final ICounter complexity = analyze();
  		assertEquals(CounterImpl.getInstance(1, 1), complexity);
  	}
  
  	@Test
  	public void testIf3() throws Exception {
  		instrument(If.class);
  		target.test(0);
  		target.test(1);
  		final ICounter complexity = analyze();
  		assertEquals(CounterImpl.getInstance(0, 2), complexity);
  	}
  
  	public static class TwoIf implements Target {
  		public void test(int arg) {
  			if (arg < 0) {
  				nop();
  			}
  			if (arg > 0) {
  				nop();
  			}
  		}
  	}
  
  	@Test
  	public void testTwoIf1() throws Exception {
  		instrument(TwoIf.class);
  		final ICounter complexity = analyze();
  		assertEquals(CounterImpl.getInstance(3, 0), complexity);
  	}
  
  	@Test
  	public void testTwoIf2() throws Exception {
  		instrument(TwoIf.class);
  		target.test(-1);
  		final ICounter complexity = analyze();
  		assertEquals(CounterImpl.getInstance(2, 1), complexity);
  	}
  
  	@Test
  	public void testTwoIf3() throws Exception {
  		instrument(TwoIf.class);
  		target.test(-1);
  		target.test(0);
  		final ICounter complexity = analyze();
  		assertEquals(CounterImpl.getInstance(1, 2), complexity);
  	}
  
  	@Test
  	public void testTwoIf4() throws Exception {
  		instrument(TwoIf.class);
  		target.test(-1);
  		target.test(+1);
  		final ICounter complexity = analyze();
  		assertEquals(CounterImpl.getInstance(0, 3), complexity);
  	}
  
  	public static class NestedIf implements Target {
  		public void test(int arg) {
  			if (arg >= 0) {
  				if (arg == 0) {
  					nop();
  				}
  				nop();
  			}
  		}
  	}
  
  	@Test
  	public void testNestedIf1() throws Exception {
  		instrument(NestedIf.class);
  		final ICounter complexity = analyze();
  		assertEquals(CounterImpl.getInstance(3, 0), complexity);
  	}
  
  	@Test
  	public void testNestedIf2() throws Exception {
  		instrument(NestedIf.class);
  		target.test(-1);
  		final ICounter complexity = analyze();
  		assertEquals(CounterImpl.getInstance(2, 1), complexity);
  	}
  
  	@Test
  	public void testNestedIf3() throws Exception {
  		instrument(NestedIf.class);
  		target.test(-1);
  		target.test(0);
  		final ICounter complexity = analyze();
  		assertEquals(CounterImpl.getInstance(1, 2), complexity);
  	}
  
  	@Test
  	public void testNestedIf4() throws Exception {
  		instrument(NestedIf.class);
  		target.test(-1);
  		target.test(0);
  		target.test(+1);
  		final ICounter complexity = analyze();
  		assertEquals(CounterImpl.getInstance(0, 3), complexity);
  	}
  
  	public static class Switch implements Target {
  		public void test(int arg) {
  			switch (arg) {
  			case 1:
  				nop();
  				break;
  			case 2:
  				nop();
  				break;
  			}
  		}
  	}
  
  	@Test
  	public void testSwitch1() throws Exception {
  		instrument(Switch.class);
  		final ICounter complexity = analyze();
  		assertEquals(CounterImpl.getInstance(3, 0), complexity);
  	}
  
  	@Test
  	public void testSwitch2() throws Exception {
  		instrument(Switch.class);
  		target.test(0);
  		final ICounter complexity = analyze();
  		assertEquals(CounterImpl.getInstance(2, 1), complexity);
  	}
  
  	@Test
  	public void testSwitch3() throws Exception {
  		instrument(Switch.class);
  		target.test(0);
  		target.test(1);
  		final ICounter complexity = analyze();
  		assertEquals(CounterImpl.getInstance(1, 2), complexity);
  	}
  
  	@Test
  	public void testSwitch4() throws Exception {
  		instrument(Switch.class);
  		target.test(0);
  		target.test(1);
  		target.test(2);
  		final ICounter complexity = analyze();
  		assertEquals(CounterImpl.getInstance(0, 3), complexity);
  	}
  
  	private void instrument(final Class<? extends Target> clazz)
  			throws Exception {
  		bytes = TargetLoader.getClassDataAsBytes(clazz);
  		final byte[] instrumented = new Instrumenter(runtime).instrument(bytes,
  				"TestTarget");
  		final TargetLoader loader = new TargetLoader();
  		target = (Target) loader.add(clazz, instrumented).newInstance();
  	}
  
  	private ICounter analyze() throws IOException {
  		final CoverageBuilder builder = new CoverageBuilder();
  		final ExecutionDataStore store = new ExecutionDataStore();
  		data.collect(store, new SessionInfoStore(), false);
  		final Analyzer analyzer = new Analyzer(store, builder);
  		analyzer.analyzeClass(bytes, "TestTarget");
  		final Collection<IClassCoverage> classes = builder.getClasses();
  		assertEquals(1, classes.size(), 0.0);
  		final IClassCoverage classCoverage = classes.iterator().next();
  		for (final IMethodCoverage m : classCoverage.getMethods()) {
  			if (m.getName().equals("test")) {
  				return m.getComplexityCounter();
  			}
  		}
  		throw new AssertionError("No test() method.");
  	}
  
  }
  