feat: Introduced additonal parallelism to the test suite execution

.travis.yml

@@ -62,10 +62,10 @@ before_script:
   '
 
 env:
-  - TEST_BED_M2_HOME=/home/travis/.arquillian/mvn/apache-maven-3.3.9
+  - TEST_BED_M2_HOME=/home/travis/.arquillian/mvn/apache-maven-3.3.9 MAVEN_OPTS="-Xms512m -Xmx1024m -XX:+TieredCompilation -XX:TieredStopAtLevel=1"
 
 script:
-  - ./mvnw clean verify -P travis -DJAVA_OPTS="-XX:-UseLoopPredicate"
+  - ./mvnw clean verify -P travis -DJAVA_OPTS="-XX:-UseLoopPredicate" -T 100
   - 'if [ $GENERATE_DOC -eq 0 ]; then
         ./.asciidoctor/generate.sh --keep;
      fi'

functional-tests/test-bed/src/main/java/org/arquillian/smart/testing/ftest/testbed/project/BuildConfigurator.java

@@ -37,9 +37,10 @@ public class BuildConfigurator {
     private boolean ignoreBuildFailure = false;
     private boolean skipTests = false;
     private File workingDirectory;
-    private String mavenOpts = "-Xms512m -Xmx1024m";
+    private String mavenOpts = "-Xms512m -Xmx1024m -XX:+TieredCompilation -XX:TieredStopAtLevel=1";
     private String mavenVersion;
     private Using usingInstallation;
+    private boolean useThreads = true;
 
     BuildConfigurator(ProjectBuilder projectBuilder) {
         systemProperties.put("surefire.exitTimeout", "-1"); // see http://bit.ly/2vARQ5p
@@ -183,11 +184,16 @@ public BuildConfigurator excludeProjects(String... projects) {
         return this;
     }
 
-    public BuildConfigurator useMavenVersion(String mavenVersion){
+    public BuildConfigurator useMavenVersion(String mavenVersion) {
         this.mavenVersion = mavenVersion;
         return this;
     }
 
+    public BuildConfigurator useThreads(boolean useThreads){
+        this.useThreads = useThreads;
+        return this;
+    }
+
     void enableDebugOptions() {
         if (isRemoteDebugEnabled()) {
             final String debugOptions = String.format(MVN_DEBUG_AGENT, shouldSuspend(), getRemotePort());
@@ -268,6 +274,10 @@ String getMavenVersion() {
         return mavenVersion;
     }
 
+    boolean useThreads(){
+        return useThreads;
+    }
+
     private int getAvailableLocalPort() {
         ServerSocket socket = null;
         try {

functional-tests/test-bed/src/main/java/org/arquillian/smart/testing/ftest/testbed/project/ProjectBuilder.java

@@ -66,6 +66,7 @@ private BuiltProject executeGoals(String... goals) {
         final BuiltProject build = embeddedMaven
                     .setShowVersion(true)
                     .setGoals(goals)
+                    .setThreads(buildConfigurator.useThreads() ? "50C" : null)
                     .setProjects(buildConfigurator.getModulesToBeBuilt())
                     .setDebug(buildConfigurator.isMavenDebugOutputEnabled())
                     .setQuiet(buildConfigurator.disableQuietWhenAnyDebugModeEnabled() && buildConfigurator.isQuietMode())

functional-tests/test-bed/src/test/java/org/arquillian/smart/testing/ftest/configuration/SurefireForksConfigurationTest.java

@@ -37,7 +37,7 @@ public void test_with_reuse_forks_false() {
 
     @Test
     public void test_with_fork_count_zero() {
-        verifyTestSuiteExecution("forkCount", "0");
+        verifyTestSuiteExecution(false, "forkCount", "0");
     }
 
     @Test
@@ -57,10 +57,14 @@ public void test_with_multiple_forks_not_reusing_forks() {
 
     @Test
     public void test_with_fork_count_zero_not_reusing_forks() {
-        verifyTestSuiteExecution("forkCount", "0", "reuseForks", "false");
+        verifyTestSuiteExecution(false, "forkCount", "0", "reuseForks", "false");
     }
 
-    private void verifyTestSuiteExecution(String... systemPropertiesPairs) {
+    private void verifyTestSuiteExecution(String... systemPropertiesPairs){
+        verifyTestSuiteExecution(true, systemPropertiesPairs);
+    }
+
+    private void verifyTestSuiteExecution(boolean useThreads, String... systemPropertiesPairs) {
         // given
         final Project project = testBed.getProject();
 
@@ -80,6 +84,7 @@ private void verifyTestSuiteExecution(String... systemPropertiesPairs) {
                 .logBuildOutput(false)
                 .withSystemProperties(systemPropertiesPairs)
                 .withSystemProperties(SMART_TESTING_REPORT_ENABLE, "true")
+                .useThreads(useThreads)
             .configure()
             .run();