Fail tests if they trigger a deprecation warning

Author: jjohannes

src/test/java/org/gradlex/javamodule/dependencies/test/fixture/GradleBuild.java

@@ -136,7 +136,7 @@ public GradleRunner runner(boolean projectIsolation, String... args) {
         );
         Stream<String> standardArgs = Stream.of(
                 "-s",
-                "--warning-mode=all",
+                "--warning-mode=fail",
                 "-Porg.gradlex.java-module-dependencies.register-help-tasks=" + withHelpTasks
         );
         GradleRunner runner = GradleRunner.create()