diff --git a/src/main/java/de/marhali/easyi18n/settings/ProjectSettingsService.java b/src/main/java/de/marhali/easyi18n/settings/ProjectSettingsService.java
index 1cc0538..3363ec5 100644
--- a/src/main/java/de/marhali/easyi18n/settings/ProjectSettingsService.java
+++ b/src/main/java/de/marhali/easyi18n/settings/ProjectSettingsService.java
@@ -31,7 +31,7 @@ public class ProjectSettingsService implements PersistentStateComponent<ProjectS
      * Sets the provided configuration and invalidates the merged state.
      * @param state New configuration
      */
-    protected void setState(@NotNull ProjectSettingsState state) {
+    public void setState(@NotNull ProjectSettingsState state) {
         this.state = state;
     }
 
diff --git a/src/test/java/de/marhali/easyi18n/e2e/EndToEndTestCase.java b/src/test/java/de/marhali/easyi18n/e2e/EndToEndTestCase.java
new file mode 100644
index 0000000..a5a7f2f
--- /dev/null
+++ b/src/test/java/de/marhali/easyi18n/e2e/EndToEndTestCase.java
@@ -0,0 +1,85 @@
+package de.marhali.easyi18n.e2e;
+
+import com.intellij.testFramework.fixtures.BasePlatformTestCase;
+
+import de.marhali.easyi18n.InstanceManager;
+import de.marhali.easyi18n.settings.ProjectSettings;
+import de.marhali.easyi18n.settings.ProjectSettingsService;
+import de.marhali.easyi18n.settings.ProjectSettingsState;
+
+import org.apache.commons.io.FileUtils;
+import org.apache.commons.io.filefilter.IOFileFilter;
+import org.apache.commons.io.filefilter.TrueFileFilter;
+
+import java.io.File;
+import java.io.IOException;
+import java.nio.charset.Charset;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.Collection;
+import java.util.Iterator;
+import java.util.Objects;
+
+/**
+ * End-to-end test case.
+ * @author marhali
+ */
+public abstract class EndToEndTestCase extends BasePlatformTestCase {
+
+    private static final Charset CHARSET = StandardCharsets.UTF_8;
+
+    private final ProjectSettings settings;
+    private Path tempPath;
+
+    public EndToEndTestCase(ProjectSettings settings) {
+        this.settings = settings;
+    }
+
+    @Override
+    protected void setUp() throws Exception {
+        super.setUp();
+        ProjectSettingsService.get(getProject()).setState(new ProjectSettingsState(settings));
+        tempPath = Files.createTempDirectory("tests-easyi18n-");
+    }
+
+    @Override
+    protected void tearDown() throws Exception {
+        FileUtils.deleteDirectory(tempPath.toFile());
+        super.tearDown();
+    }
+
+    public void testParseAndSerialize() throws IOException {
+        // Read translation files based on the provided settings
+        InstanceManager.get(getProject()).reload();
+
+        // Save the cached translation data to a temporary output directory
+        ProjectSettingsState out = new ProjectSettingsState(settings);
+        out.setLocalesDirectory(tempPath.toString());
+        ProjectSettingsService.get(getProject()).setState(out);
+
+        InstanceManager.get(getProject()).store().saveToPersistenceLayer(success -> {});
+
+        // Compare file structure and contents
+        IOFileFilter fileFilter = TrueFileFilter.INSTANCE;
+
+        File originalDirectory = new File(Objects.requireNonNull(settings.getLocalesDirectory()));
+        Collection<File> originalFiles = FileUtils.listFiles(originalDirectory, fileFilter, fileFilter);
+
+        File outputDirectory = tempPath.toFile();
+        Collection<File> outputFiles = FileUtils.listFiles(outputDirectory, fileFilter, fileFilter);
+
+        assertEquals(originalFiles.size(), outputFiles.size());
+
+        Iterator<File> originalFilesIterator = originalFiles.iterator();
+        Iterator<File> outputFilesIterator = outputFiles.iterator();
+
+        while(originalFilesIterator.hasNext()) {
+            File originalFile = originalFilesIterator.next();
+            File outputFile = outputFilesIterator.next();
+
+            assertEquals(FileUtils.readFileToString(originalFile, CHARSET),
+                    FileUtils.readFileToString(outputFile, CHARSET));
+        }
+    }
+}
diff --git a/src/test/java/de/marhali/easyi18n/e2e/TestSettingsState.java b/src/test/java/de/marhali/easyi18n/e2e/TestSettingsState.java
new file mode 100644
index 0000000..1804075
--- /dev/null
+++ b/src/test/java/de/marhali/easyi18n/e2e/TestSettingsState.java
@@ -0,0 +1,46 @@
+package de.marhali.easyi18n.e2e;
+
+import de.marhali.easyi18n.io.folder.FolderStrategyType;
+import de.marhali.easyi18n.io.parser.ParserStrategyType;
+import de.marhali.easyi18n.settings.presets.DefaultPreset;
+
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+/**
+ * Settings base for end-to-end tests.
+ * @author marhali
+ */
+public class TestSettingsState extends DefaultPreset {
+
+    private final String localesDirectory;
+    private final FolderStrategyType folderStrategy;
+    private final ParserStrategyType parserStrategy;
+
+    public TestSettingsState(String localesDirectory, FolderStrategyType folderStrategy, ParserStrategyType parserStrategy) {
+        this.localesDirectory = localesDirectory;
+        this.folderStrategy = folderStrategy;
+        this.parserStrategy = parserStrategy;
+    }
+
+
+    @Override
+    public @Nullable String getLocalesDirectory() {
+        return localesDirectory;
+    }
+
+    @Override
+    public @NotNull FolderStrategyType getFolderStrategy() {
+        return folderStrategy;
+    }
+
+    @Override
+    public @NotNull ParserStrategyType getParserStrategy() {
+        return parserStrategy;
+    }
+
+    @Override
+    public @NotNull String getFilePattern() {
+        return "*.*";
+    }
+}