diff --git a/languages/multi-language/pom.xml b/languages/multi-language/pom.xml
index ba0908c50..ca87dfa7e 100644
--- a/languages/multi-language/pom.xml
+++ b/languages/multi-language/pom.xml
@@ -8,6 +8,19 @@
     </parent>
     <artifactId>multi-language</artifactId>
 
-    <dependencies></dependencies>
+    <dependencies>
+        <dependency>
+            <groupId>de.jplag</groupId>
+            <artifactId>java</artifactId>
+            <version>${revision}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>de.jplag</groupId>
+            <artifactId>cpp</artifactId>
+            <version>${revision}</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
 
 </project>
diff --git a/languages/multi-language/src/main/java/de/jplag/multilang/MultiLanguageOptions.java b/languages/multi-language/src/main/java/de/jplag/multilang/MultiLanguageOptions.java
index 0f3f4f645..c94bf0406 100644
--- a/languages/multi-language/src/main/java/de/jplag/multilang/MultiLanguageOptions.java
+++ b/languages/multi-language/src/main/java/de/jplag/multilang/MultiLanguageOptions.java
@@ -11,20 +11,24 @@
 
 public class MultiLanguageOptions extends LanguageOptions {
     private static final String ERROR_LANGUAGE_NOT_FOUND = "The selected language %s could not be found";
-    private static final String ERROR_NOT_ENOUGH_LANGUAGES = "To use multi language specify at least 2 languages";
+    private static final String ERROR_NOT_ENOUGH_LANGUAGES = "To use multi language specify at least 1 language";
 
-    public LanguageOption<String> languageNames = createOption(OptionType.string(), "langs",
+    public LanguageOption<String> languageNames = createOption(OptionType.string(), "languages",
             "The languages that should be used. This is a ',' separated list");
     private List<Language> languages = null;
 
     public List<Language> getLanguages() {
         if (this.languages == null) {
+            if (languageNames.getValue() == null) {
+                throw new IllegalArgumentException(ERROR_NOT_ENOUGH_LANGUAGES);
+            }
+
             List<Language> languages = Arrays.stream(languageNames.getValue().split(","))
                     .map(name -> LanguageLoader.getLanguage(name)
                             .orElseThrow(() -> new IllegalArgumentException(String.format(ERROR_LANGUAGE_NOT_FOUND, name))))
                     .filter(language -> !language.getClass().equals(MultiLanguage.class)).toList();
 
-            if (languages.size() <= 1) {
+            if (languages.isEmpty()) {
                 throw new IllegalArgumentException(ERROR_NOT_ENOUGH_LANGUAGES);
             }
 
diff --git a/languages/multi-language/src/test/java/de/java/multilang/MultilangTest.java b/languages/multi-language/src/test/java/de/java/multilang/MultilangTest.java
new file mode 100644
index 000000000..670b98dc8
--- /dev/null
+++ b/languages/multi-language/src/test/java/de/java/multilang/MultilangTest.java
@@ -0,0 +1,79 @@
+package de.java.multilang;
+
+import static de.jplag.SharedTokenType.FILE_END;
+
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.util.List;
+import java.util.Set;
+import java.util.TreeSet;
+
+import org.junit.jupiter.api.AfterAll;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+
+import de.jplag.ParsingException;
+import de.jplag.Token;
+import de.jplag.TokenType;
+import de.jplag.cpp.CPPTokenType;
+import de.jplag.java.JavaTokenType;
+import de.jplag.multilang.MultiLanguage;
+import de.jplag.multilang.MultiLanguageOptions;
+
+public class MultilangTest {
+    private static File testDataDirectory;
+    private static File javaCode;
+    private static File cppCode;
+
+    private static List<TokenType> expectedTokens = List.of(CPPTokenType.FUNCTION_BEGIN, CPPTokenType.RETURN, CPPTokenType.FUNCTION_END, FILE_END,
+            JavaTokenType.J_CLASS_BEGIN, JavaTokenType.J_CLASS_END, FILE_END);
+
+    @BeforeAll
+    static void setUp() throws IOException {
+        testDataDirectory = Files.createTempDirectory("multiLanguageTestData").toFile();
+        cppCode = new File(testDataDirectory, "CppCode.cpp");
+        javaCode = new File(testDataDirectory, "JavaCode.java");
+
+        MultilangTest.class.getResourceAsStream("/de/jplag/multilang/testDataSet/CppCode.cpp").transferTo(new FileOutputStream(cppCode));
+        MultilangTest.class.getResourceAsStream("/de/jplag/multilang/testDataSet/JavaCode.java").transferTo(new FileOutputStream(javaCode));
+    }
+
+    @Test
+    void testMultiLanguageParsing() throws ParsingException {
+        MultiLanguage languageModule = new MultiLanguage();
+        ((MultiLanguageOptions) languageModule.getOptions()).languageNames.setValue("java,cpp");
+
+        Set<File> sources = new TreeSet<>(List.of(javaCode, cppCode)); // Using TreeSet to ensure order of entries
+        List<Token> tokens = languageModule.parse(sources, false);
+
+        Assertions.assertEquals(expectedTokens, tokens.stream().map(Token::getType).toList());
+    }
+
+    @Test
+    void testNoLanguagesConfigured() {
+        MultiLanguage languageModule = new MultiLanguage();
+        Assertions.assertThrowsExactly(IllegalArgumentException.class, () -> {
+            languageModule.parse(Set.of(javaCode, cppCode), false);
+        });
+    }
+
+    @Test
+    void testInvalidLanguage() {
+        MultiLanguage languageModule = new MultiLanguage();
+        ((MultiLanguageOptions) languageModule.getOptions()).languageNames.setValue("thisIsNotALanguage");
+
+        Assertions.assertThrowsExactly(IllegalArgumentException.class, () -> {
+            languageModule.parse(Set.of(javaCode, cppCode), false);
+        });
+    }
+
+    @AfterAll
+    static void cleanUp() {
+        javaCode.delete();
+        cppCode.delete();
+        testDataDirectory.delete();
+    }
+}
diff --git a/languages/multi-language/src/test/resources/de/jplag/multilang/testDataSet/CppCode.cpp b/languages/multi-language/src/test/resources/de/jplag/multilang/testDataSet/CppCode.cpp
new file mode 100644
index 000000000..e9cdae165
--- /dev/null
+++ b/languages/multi-language/src/test/resources/de/jplag/multilang/testDataSet/CppCode.cpp
@@ -0,0 +1,3 @@
+int main() {
+    return 0;
+}
\ No newline at end of file
diff --git a/languages/multi-language/src/test/resources/de/jplag/multilang/testDataSet/JavaCode.java b/languages/multi-language/src/test/resources/de/jplag/multilang/testDataSet/JavaCode.java
new file mode 100644
index 000000000..32aacd210
--- /dev/null
+++ b/languages/multi-language/src/test/resources/de/jplag/multilang/testDataSet/JavaCode.java
@@ -0,0 +1,3 @@
+public class JavaCode {
+
+}
\ No newline at end of file