fix(phobos): correct copy helper quoting

src/main/resources/de/tum/cit/ase/ares/api/templates/phobos/PhobosCopyTool.sh

@@ -2,6 +2,6 @@
 # Script to copy required files to /var/tmp/opt/core/
 set -e  # Exit immediately if a command exits with a non-zero status
 set -u  # Treat unset variables as an error
-TARGET_DIR=“/var/tmp/opt/core”
+TARGET_DIR="/var/tmp/opt/core"
 # Copy SpecificExercise.cfg to target directory
 cp -v SpecificExercise.cfg "$TARGET_DIR/"

src/test/java/de/tum/cit/ase/ares/api/phobos/PhobosShellContractTest.java

@@ -1,11 +1,17 @@
 package de.tum.cit.ase.ares.api.phobos;
 
 import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
 import static org.junit.jupiter.api.Assertions.assertTrue;
 
 import java.io.IOException;
+import java.io.OutputStream;
+import java.nio.charset.StandardCharsets;
 import java.nio.file.Files;
 import java.nio.file.Path;
+import java.util.List;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
 
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.io.TempDir;
@@ -47,12 +53,52 @@ void missingBaseAndRuntimeDependenciesUseDocumentedFailClosedErrors() throws Exc
 		assertTrue(missingRuntime.output().contains("PHB-ERUNTIME"));
 	}
 
+	@Test
+	void copyToolAssignsTargetDirectoryWithAsciiQuotes() throws Exception {
+		Path copyTool = TEMPLATES.resolve("PhobosCopyTool.sh");
+		String contents = Files.readString(copyTool, StandardCharsets.UTF_8);
+
+		// The script must not contain Unicode curly quotation marks (U+201C / U+201D).
+		assertFalse(contents.indexOf('“') >= 0 || contents.indexOf('”') >= 0,
+				"PhobosCopyTool.sh must not contain Unicode curly quotation marks");
+
+		// Parse the assignment purely in Java: the fixture is never executed and its
+		// path is never interpolated into a shell command. Exactly one TARGET_DIR
+		// assignment must exist so a malformed or duplicate line cannot satisfy the
+		// test.
+		List<String> assignments = contents.lines().map(String::stripLeading)
+				.filter(line -> line.startsWith("TARGET_DIR=")).toList();
+		assertEquals(1, assignments.size(), "PhobosCopyTool.sh must contain exactly one TARGET_DIR assignment");
+
+		// The assignment must use ASCII double quotes around exactly /var/tmp/opt/core.
+		Matcher matcher = Pattern.compile("^TARGET_DIR=\"(/var/tmp/opt/core)\"$").matcher(assignments.get(0));
+		assertTrue(matcher.matches(),
+				"TARGET_DIR must be assigned with ASCII double quotes as \"/var/tmp/opt/core\", but was: "
+						+ assignments.get(0));
+		assertEquals("/var/tmp/opt/core", matcher.group(1));
+
+		// Validate Bash syntax without building a shell command string or passing the
+		// fixture path to Bash: feed the already-read script content to `bash -n` via
+		// stdin.
+		ProcessResult syntax = runBashSyntaxCheck(contents);
+		assertEquals(0, syntax.exitCode(), syntax.output());
+	}
+
 	private ProcessResult run(String script) throws IOException, InterruptedException {
 		Process process = new ProcessBuilder("bash", "-c", script).redirectErrorStream(true).start();
 		String output = new String(process.getInputStream().readAllBytes(), java.nio.charset.StandardCharsets.UTF_8);
 		return new ProcessResult(process.waitFor(), output);
 	}
 
+	private ProcessResult runBashSyntaxCheck(String scriptContent) throws IOException, InterruptedException {
+		Process process = new ProcessBuilder("bash", "-n").redirectErrorStream(true).start();
+		try (OutputStream stdin = process.getOutputStream()) {
+			stdin.write(scriptContent.getBytes(StandardCharsets.UTF_8));
+		}
+		String output = new String(process.getInputStream().readAllBytes(), StandardCharsets.UTF_8);
+		return new ProcessResult(process.waitFor(), output);
+	}
+
 	private record ProcessResult(int exitCode, String output) {
 	}
 }