Suppress JaCoCo output in App Engine tests.

PiperOrigin-RevId: 882650414
Change-Id: I72e1179c04caac00c9d7ff09cc9e31389bd7cdd5

Author: ludoch

lib/tools_api/src/test/java/com/google/appengine/tools/KickStartTest.java

@@ -165,6 +165,7 @@ private List<String> runWithKickStart(File webInfDir) throws IOException, Interr
     ImmutableList<String> args =
         ImmutableList.of(
             javaBinary,
+            "-Djacoco-agent.output=none",
             "-classpath",
             classpath,
             "--add-opens",
@@ -174,6 +175,7 @@ private List<String> runWithKickStart(File webInfDir) throws IOException, Interr
             "--add-opens",
             "java.base/sun.net.www.protocol.https=ALL-UNNAMED",
             KickStart.class.getName(),
+            "--jvm_flag=-Djacoco-agent.output=none",
             "--test_mode",
             "com.google.appengine.tools.PrintDefaultCharset",
             webInfDir.getPath());

lib/xml_validator_test/src/test/java/com/google/appengine/tools/admin/XmlValidatorTest.java

@@ -100,7 +100,7 @@ public class XmlValidatorTest {
   @Before
   public void setUp() throws Exception {
     xmlValidatorJar = getLibXmlValidatorJarFile();
-    assertWithMessage(xmlValidatorJar.toString() + " error, cannot read the jar.")
+    assertWithMessage("%s error, cannot read the jar.", xmlValidatorJar.toString())
         .that(xmlValidatorJar.canRead())
         .isTrue();
   }
@@ -153,6 +153,7 @@ private void validate(boolean shouldPass, TestXml... testXmls)
     String javaBin = JAVA_HOME.value() + "/bin/java";
     List<String> args = new ArrayList<>();
     args.add(javaBin);
+    args.add("-Djacoco-agent.output=none");
     args.add("-verbose:class");
     args.add("-classpath");
     args.add(xmlValidatorJar.getAbsolutePath());

runtime/test/src/test/java/com/google/apphosting/runtime/jetty9/JavaRuntimeViaHttpBase.java

@@ -263,6 +263,7 @@ public <ApiServerT extends Closeable> RuntimeContext<ApiServerT> createRuntimeCo
     }
     baseArgsBuilder
         .add(
+            "-Djacoco-agent.output=none",
             "-Dcom.google.apphosting.runtime.jetty94.LEGACY_MODE=" + legacyMode,
             "-Dappengine.use.EE8=" + jakartaVersion.equals("EE8"),
             "-Dappengine.use.EE10=" + jakartaVersion.equals("EE10"),