remove jacoco agent from classpath if present

fixes #1070

README.md

@@ -12,6 +12,7 @@ Read all about it at http://pitest.org
 
 * #1063 - Improve filtering of equivalent return mutants
 * #1066 - Expand static initializer filtering
+* #1070 - Remove jacoco agent if present on argline
 
 ### 1.9.3
 

pitest-entry/src/main/java/org/pitest/process/WrappingProcess.java

@@ -85,13 +85,23 @@ private ProcessBuilder createProcessBuilder(String javaProc,
 
     // IBM jdk adds this, thereby breaking everything
     removeClassPathProperties(cmd);
+
+    removeJacocoAgent(cmd);
 
     return new ProcessBuilder(cmd);
   }
 
+  private void removeJacocoAgent(List<String> cmd) {
+    removeFromClassPath(cmd, line -> line.startsWith("-javaagent") && line.contains("jacoco"));
+  }
+
   private static void removeClassPathProperties(List<String> cmd) {
+    removeFromClassPath(cmd, s -> s.startsWith("-Djava.class.path"));
+  }
+
+  private static void removeFromClassPath(List<String> cmd, Predicate<String> match) {
     for (int i = cmd.size() - 1; i >= 0; i--) {
-      if (cmd.get(i).startsWith("-Djava.class.path")) {
+      if (match.test(cmd.get(i))) {
         cmd.remove(i);
       }
     }
@@ -106,10 +116,10 @@ private List<String> createLaunchArgs(String javaProcess,
 
     createClasspathJar(classPath, cmd);
 
-    cmd.addAll(args);
-
     addPITJavaAgent(agentJarLocator, cmd);
 
+    cmd.addAll(args);
+
     addLaunchJavaAgents(cmd);
 
     cmd.add(mainClass.getName());

pitest-maven-verification/src/test/java/org/pitest/PitMojoIT.java

@@ -34,6 +34,7 @@
 import java.io.InputStream;
 import java.util.Properties;
 
+import static java.util.Arrays.asList;
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.junit.Assert.*;
 import static org.junit.Assume.assumeFalse;
@@ -445,6 +446,14 @@ public void shouldFailCleanlyWhenTestPluginMissing() throws IOException {
     }
   }
 
+  @Test
+  public void shouldDisableJacoco() throws IOException, VerificationException {
+    File testDir = prepare("/pit-jacoco");
+    verifier.executeGoals(asList("test-compile", "org.pitest:pitest-maven:mutationCoverage"));
+
+    String actual = readResults(testDir);
+    assertThat(actual).doesNotContain("RUN_ERROR");
+  }
 
   private void skipIfJavaVersionNotSupportByThirdParty() {
     String javaVersion = System.getProperty("java.version");
@@ -474,6 +483,7 @@ private File prepare(String testPath) throws IOException,
     verifier = new Verifier(path);
     verifier.setAutoclean(false);
     verifier.setDebug(true);
+    verifier.getCliOptions().add("-Dverbose=true");
     verifier.getCliOptions().add("-Dpit.version=" + VERSION);
     verifier.getCliOptions().add(
             "-Dthreads=" + (Runtime.getRuntime().availableProcessors()));

pitest-maven-verification/src/test/resources/pit-jacoco/pom.xml

@@ -0,0 +1,96 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project
+        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+        xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"
+        xmlns="http://maven.apache.org/POM/4.0.0">
+    <modelVersion>4.0.0</modelVersion>
+    <groupId>com.example</groupId>
+    <artifactId>pitest-sample</artifactId>
+    <version>0.1-SNAPSHOT</version>
+    <name>pit maven findOccupiedTestPackages coverage</name>
+
+    <properties>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <version>4.13.1</version>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>2.4</version>
+                <configuration>
+                    <source>1.7</source>
+                    <target>1.7</target>
+                </configuration>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-surefire-plugin</artifactId>
+                <version>3.0.0-M1</version>
+            </plugin>
+            <plugin>
+                <groupId>org.pitest</groupId>
+                <artifactId>pitest-maven</artifactId>
+                <version>${pit.version}</version>
+                <configuration>
+                    <verbose>true</verbose>
+                    <outputFormats>
+                        <value>XML</value>
+                    </outputFormats>
+                    <timestampedReports>false</timestampedReports>
+                    <exportLineCoverage>true</exportLineCoverage>
+                </configuration>
+            </plugin>
+            <plugin>
+                <groupId>org.jacoco</groupId>
+                <artifactId>jacoco-maven-plugin</artifactId>
+                <version>0.8.8</version>
+                <executions>
+                    <execution>
+                        <goals>
+                            <goal>prepare-agent</goal>
+                        </goals>
+                    </execution>
+                    <execution>
+                        <id>jacoco-report</id>
+                        <phase>test</phase>
+                        <goals>
+                            <goal>report</goal>
+                        </goals>
+                    </execution>
+                    <!-- Add this checking -->
+                    <execution>
+                        <id>jacoco-check</id>
+                        <goals>
+                            <goal>check</goal>
+                        </goals>
+                        <configuration>
+                            <rules>
+                                <rule>
+                                    <element>PACKAGE</element>
+                                    <limits>
+                                        <limit>
+                                            <counter>LINE</counter>
+                                            <value>COVEREDRATIO</value>
+                                            <minimum>0.9</minimum>
+                                        </limit>
+                                    </limits>
+                                </rule>
+                            </rules>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
+        </plugins>
+    </build>
+
+</project>

pitest-maven-verification/src/test/resources/pit-jacoco/src/main/java/sources/DiscoveredClass.java

@@ -0,0 +1,9 @@
+package sources;
+
+public class DiscoveredClass {
+
+	public int add(int a, int b) {
+		return a + b;
+	}
+
+}

pitest-maven-verification/src/test/resources/pit-jacoco/src/main/java/sources/MessageBuilder.java

@@ -0,0 +1,17 @@
+package sources;
+
+public class MessageBuilder {
+
+    public String getMessage(String name) {
+
+        StringBuilder result = new StringBuilder();
+
+        if (name == null || name.trim().length() == 0) {
+            result.append("Stuff!");
+        } else {
+            result.append("Hello " + name);
+        }
+        return result.toString();
+    }
+
+}

pitest-maven-verification/src/test/resources/pit-jacoco/src/test/java/tests/DiscoveredTest.java

@@ -0,0 +1,16 @@
+package tests;
+
+import static junit.framework.Assert.assertEquals;
+
+import org.junit.Test;
+
+import sources.DiscoveredClass;
+
+public class DiscoveredTest {
+
+    @Test
+    public void testAdd() {
+        assertEquals(2, new DiscoveredClass().add(1, 1));
+    }
+
+}

pitest-maven-verification/src/test/resources/pit-jacoco/src/test/java/tests/TestMessageBuilder.java

@@ -0,0 +1,16 @@
+package tests;
+
+import org.junit.Test;
+import sources.MessageBuilder;
+
+import static org.junit.Assert.assertEquals;
+
+public class TestMessageBuilder {
+
+    @Test
+    public void testName() {
+        MessageBuilder obj = new MessageBuilder();
+        assertEquals("Hello there", obj.getMessage("there"));
+    }
+
+}