Revert "Make StandaloneTests lenient against unexpected error output"

This reverts commit 932ba21.

Author: marcphilipp

platform-tooling-support-tests/projects/standalone/expected-err.txt

@@ -1,4 +1,3 @@
->> JAVA VERSION >>
 .+ org.junit.platform.launcher.core.ServiceLoaderRegistry load
 .+ Loaded LauncherInterceptor instances: ..
 .+ org.junit.platform.launcher.core.ServiceLoaderRegistry load

platform-tooling-support-tests/src/test/java/platform/tooling/support/tests/StandaloneTests.java

@@ -21,6 +21,7 @@
 import java.nio.file.Files;
 import java.nio.file.Path;
 import java.util.ArrayList;
+import java.util.List;
 
 import de.sormuras.bartholdy.Result;
 import de.sormuras.bartholdy.jdk.Jar;
@@ -391,7 +392,7 @@ void executeOnJava8() throws IOException {
 
 		var workspace = Request.WORKSPACE.resolve("standalone");
 		var expectedOutLines = Files.readAllLines(workspace.resolve("expected-out.txt"));
-		var expectedErrLines = Files.readAllLines(workspace.resolve("expected-err.txt"));
+		var expectedErrLines = getExpectedErrLinesOnJava8(workspace);
 		assertLinesMatch(expectedOutLines, result.getOutputLines("out"));
 		assertLinesMatch(expectedErrLines, result.getOutputLines("err"));
 
@@ -428,7 +429,7 @@ void executeOnJava8SelectPackage() throws IOException {
 
 		var workspace = Request.WORKSPACE.resolve("standalone");
 		var expectedOutLines = Files.readAllLines(workspace.resolve("expected-out.txt"));
-		var expectedErrLines = Files.readAllLines(workspace.resolve("expected-err.txt"));
+		var expectedErrLines = getExpectedErrLinesOnJava8(workspace);
 		assertLinesMatch(expectedOutLines, result.getOutputLines("out"));
 		assertLinesMatch(expectedErrLines, result.getOutputLines("err"));
 
@@ -440,6 +441,13 @@ void executeOnJava8SelectPackage() throws IOException {
 				+ " (group ID: org.junit.vintage, artifact ID: junit-vintage-engine, version: " + vintageVersion));
 	}
 
+	private static List<String> getExpectedErrLinesOnJava8(Path workspace) throws IOException {
+		var expectedErrLines = new ArrayList<String>();
+		expectedErrLines.add(">> JAVA VERSION >>");
+		expectedErrLines.addAll(Files.readAllLines(workspace.resolve("expected-err.txt")));
+		return expectedErrLines;
+	}
+
 	@Test
 	@Order(6)
 	@Disabled("https://github.com/junit-team/junit5/issues/1724")