add unit test for issue 9, java source code version

src/main/java/se/solrike/sonarlint/impl/SonarlintAction.java

@@ -61,23 +61,20 @@ public SonarlintAction(Sonarlint task) {
    * @return list of sonarlint issues
    */
   public List<IssueEx> run(Sonarlint task, SetProperty<File> plugins, ProjectLayout layout) {
-
-    Logger logger = task.getLogger();
-
-    return analyze(task, logger, plugins, layout);
-
+    return analyze(task, task.getLogger(), plugins, layout);
   }
 
   @SuppressWarnings({ "java:S1874", "deprecation" })
   protected List<IssueEx> analyze(Sonarlint task, Logger logger, SetProperty<File> plugins, ProjectLayout layout) {
-    Map<String, String> sonarProperties = new HashMap<>();
+	Map<String, String> sonarProperties = new HashMap<>();
 
     Project project = task.getProject();
-    // Java sourceCompatibility
+    // Java sourceCompatibility needs to be read so project is actually configured
     if (project.getProperties().containsKey("sourceCompatibility")) {
       String sourceCompatibility = project.getProperties().get("sourceCompatibility").toString();
       sonarProperties.put("sonar.java.source", sourceCompatibility);
     }
+
     Set<File> compileClasspath = Collections.emptySet();
     if (task.getCompileClasspath() != null) {
       compileClasspath = task.getCompileClasspath().getFiles();

src/test/java/se/solrike/sonarlint/IntegrationTest.java

@@ -58,6 +58,9 @@ void setup() throws IOException {
           + "    sarif.enabled = true\n"
           + "  }\n"
           + "}\n"
+          + "java {\n"
+          + "   sourceCompatibility = '1.8'\n"
+          + "}"
           );
       // @formatter:on
     }
@@ -113,6 +116,28 @@ void testSonarlintListRules() throws IOException {
     // CHECKSTYLE:ON
   }
 
+  @Test
+  void testJavaVersion() throws IOException {
+	// given the project has source comparability set to 1.8 the sonarlist component shall be invokded with that.
+	// and given that default java runtime is java11
+
+	createJavaFile(Files.createFile(mProjectDir.resolve("src/main/java/Hello.java")));
+
+	// when sonarlintMain is run with debug printouts
+	BuildResult buildResult = runGradle(false, List.of("--debug", "sonarlintMain"));
+
+	// then java source shall be 1.8
+	assertThat(buildResult.getOutput()).contains("extraProperties: {sonar.java.source=1.8");
+
+    // CHECKSTYLE:OFF
+    System.err.println(buildResult.getOutput());
+    // CHECKSTYLE:ON
+  }
+
+
+
+
+
   BuildResult runGradle(List<String> args) {
     return runGradle(true, args);
   }