SCANJLIB-246 Try adding test

Author: antoine-vinot-sonarsource

lib/src/main/java/org/sonarsource/scanner/lib/internal/facade/forked/JavaRunner.java

@@ -36,7 +36,7 @@
 public class JavaRunner {
   private static final Logger LOG = LoggerFactory.getLogger(JavaRunner.class);
 
-  private static final String JRE_VERSION_ERROR = "The version of the custom JRE provided to the SonarScanner using the 'sonar.scanner.javaExePath' parameter is incompatible " +
+  static final String JRE_VERSION_ERROR = "The version of the custom JRE provided to the SonarScanner using the 'sonar.scanner.javaExePath' parameter is incompatible " +
     "with your SonarQube target. You may need to upgrade the version of Java that executes the scanner. " +
     "Refer to https://docs.sonarsource.com/sonarqube-community-build/analyzing-source-code/scanners/scanner-environment/general-requirements/ for more details.";
 

lib/src/test/java/org/sonarsource/scanner/lib/internal/facade/forked/JavaRunnerTest.java

@@ -19,16 +19,20 @@
  */
 package org.sonarsource.scanner.lib.internal.facade.forked;
 
+import java.io.IOException;
 import java.nio.file.Paths;
 import java.util.List;
 import java.util.concurrent.ConcurrentLinkedDeque;
 import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.condition.EnabledOnOs;
+import org.junit.jupiter.api.condition.OS;
 import org.junit.jupiter.api.extension.RegisterExtension;
 import org.slf4j.event.Level;
 import testutils.LogTester;
 
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.assertj.core.api.Assertions.assertThatThrownBy;
+import static org.sonarsource.scanner.lib.internal.facade.forked.JavaRunner.JRE_VERSION_ERROR;
 
 class JavaRunnerTest {
 
@@ -84,4 +88,19 @@ void execute_shouldReturnFalseWhenNonZeroExitCode() {
     assertThat(runner.execute(command, null, stdOut::add)).isFalse();
   }
 
+  @Test
+  @EnabledOnOs(OS.LINUX)
+  void execute_shouldLogUnsupportedClassVersionError() throws IOException, InterruptedException {
+
+    JavaRunner runner = new JavaRunner(Paths.get("java"), JreCacheHit.DISABLED);
+    List<String> command = List.of("-xyz");
+
+    ProcessBuilder processBuilder = new ProcessBuilder("sh", "-c", "\">&2 echo 'UnsupportedClassVersionError'\"");
+    Process process = processBuilder.start();
+
+    assertThat(runner.execute(command, "test", stdOut::add)).isFalse();
+
+    assertThat(logTester.logs(Level.ERROR)).contains(JRE_VERSION_ERROR);
+  }
+
 }