diff --git a/libs/interpreter-lib/src/parsing-util.spec.ts b/libs/interpreter-lib/src/parsing-util.spec.ts
new file mode 100644
index 000000000..f2125c9e0
--- /dev/null
+++ b/libs/interpreter-lib/src/parsing-util.spec.ts
@@ -0,0 +1,189 @@
+// SPDX-FileCopyrightText: 2023 Friedrich-Alexander-Universitat Erlangen-Nurnberg
+//
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import * as path from 'path';
+
+import { TestLogger } from '@jvalue/jayvee-execution/test';
+import {
+  JayveeServices,
+  createJayveeServices,
+  useExtension,
+} from '@jvalue/jayvee-language-server';
+import {
+  ParseHelperOptions,
+  TestLangExtension,
+  expectNoParserAndLexerErrors,
+  parseHelper,
+  readJvTestAssetHelper,
+} from '@jvalue/jayvee-language-server/test';
+import { AstNode, LangiumDocument } from 'langium';
+import { NodeFileSystem } from 'langium/node';
+
+import { extractDocumentFromFile, validateDocument } from './parsing-util';
+
+describe('Validation of parsing-util', () => {
+  let parse: (
+    input: string,
+    options?: ParseHelperOptions,
+  ) => Promise<LangiumDocument<AstNode>>;
+
+  let exitSpy: jest.SpyInstance;
+
+  let services: JayveeServices;
+
+  const logger = new TestLogger(true, undefined, false);
+
+  const readJvTestAsset = readJvTestAssetHelper(
+    __dirname,
+    '../test/assets/parsing-util/',
+  );
+
+  beforeAll(() => {
+    // Mock Process.exit
+    exitSpy = jest
+      .spyOn(process, 'exit')
+      .mockImplementation((code?: number) => {
+        if (code === undefined || code === 0) {
+          return undefined as never;
+        }
+        throw new Error(`process.exit: ${code}`);
+      });
+
+    // Register test extension
+    useExtension(new TestLangExtension());
+    // Create language services
+    services = createJayveeServices(NodeFileSystem).Jayvee;
+    // Parse function for Jayvee (without validation)
+    parse = parseHelper(services);
+  });
+
+  afterEach(() => {
+    exitSpy.mockClear();
+    logger.clearLogs();
+  });
+
+  describe('Function of validateDocument', () => {
+    async function parseAndValidateDocument(input: string) {
+      const document = await parse(input);
+      expectNoParserAndLexerErrors(document);
+
+      return validateDocument(document, services, logger);
+    }
+
+    it('should diagnose no error on valid document', async () => {
+      const text = readJvTestAsset('validateDocument/valid-document.jv');
+
+      await parseAndValidateDocument(text);
+
+      expect(exitSpy).toHaveBeenCalledTimes(0);
+      expect(logger.getLogs().infoLogs).toHaveLength(0);
+      expect(logger.getLogs().errorLogs).toHaveLength(0);
+      expect(logger.getLogs().debugLogs).toHaveLength(0);
+      expect(logger.getLogs().diagnosticLogs).toHaveLength(0);
+    });
+
+    it('should diagnose error on wrong loader type', async () => {
+      const text = readJvTestAsset(
+        'validateDocument/invalid-wrong-loader-type.jv',
+      );
+
+      try {
+        await parseAndValidateDocument(text);
+      } catch (e) {
+        expect(exitSpy).toHaveBeenCalledTimes(1);
+        expect(exitSpy).toHaveBeenCalledWith(1);
+        expect(logger.getLogs().infoLogs).toHaveLength(0);
+        expect(logger.getLogs().errorLogs).toHaveLength(0);
+        expect(logger.getLogs().debugLogs).toHaveLength(0);
+        expect(logger.getLogs().diagnosticLogs).toHaveLength(2 * 5); // 2 calls that get formated to 5 lines each
+      }
+    });
+
+    it('should diagnose no error on nonErr diagnostics', async () => {
+      const text = readJvTestAsset(
+        'validateDocument/valid-simplify-warning.jv',
+      );
+
+      try {
+        await parseAndValidateDocument(text);
+      } catch (e) {
+        expect(exitSpy).toHaveBeenCalledTimes(1);
+        expect(exitSpy).toHaveBeenCalledWith(1);
+        expect(logger.getLogs().infoLogs).toHaveLength(0);
+        expect(logger.getLogs().errorLogs).toHaveLength(0);
+        expect(logger.getLogs().debugLogs).toHaveLength(0);
+        expect(logger.getLogs().diagnosticLogs).toHaveLength(1);
+      }
+    });
+  });
+
+  describe('Function of extractDocumentFromFile', () => {
+    it('should diagnose no error on valid model file', async () => {
+      await extractDocumentFromFile(
+        path.resolve(
+          __dirname,
+          '../test/assets/parsing-util/',
+          'extractDocumentFromFile/valid-model.jv',
+        ),
+        services,
+        logger,
+      );
+
+      expect(exitSpy).toHaveBeenCalledTimes(0);
+      expect(logger.getLogs().infoLogs).toHaveLength(0);
+      expect(logger.getLogs().errorLogs).toHaveLength(0);
+      expect(logger.getLogs().debugLogs).toHaveLength(0);
+      expect(logger.getLogs().diagnosticLogs).toHaveLength(0);
+    });
+
+    it('should diagnose error on invalid extension', async () => {
+      try {
+        await extractDocumentFromFile(
+          path.resolve(
+            __dirname,
+            '../test/assets/parsing-util/',
+            'extractDocumentFromFile/invalid-extension.lv',
+          ),
+          services,
+          logger,
+        );
+      } catch (e) {
+        expect(exitSpy).toHaveBeenCalledTimes(1);
+        expect(logger.getLogs().infoLogs).toHaveLength(0);
+        expect(logger.getLogs().errorLogs).toHaveLength(1);
+        expect(logger.getLogs().errorLogs[0]).toEqual(
+          expect.stringContaining(
+            'Please choose a file with this extension: ".jv"',
+          ),
+        );
+        expect(logger.getLogs().debugLogs).toHaveLength(0);
+        expect(logger.getLogs().diagnosticLogs).toHaveLength(0);
+      }
+    });
+
+    it('should diagnose error on missing file', async () => {
+      try {
+        await extractDocumentFromFile(
+          path.resolve(
+            __dirname,
+            '../test/assets/parsing-util/',
+            'extractDocumentFromFile/invalid-missing-file.jv',
+          ),
+          services,
+          logger,
+        );
+      } catch (e) {
+        expect(exitSpy).toHaveBeenCalledTimes(1);
+        expect(logger.getLogs().infoLogs).toHaveLength(0);
+        expect(logger.getLogs().errorLogs).toHaveLength(1);
+        expect(logger.getLogs().errorLogs[0]).toMatch(
+          // eslint-disable-next-line no-useless-escape
+          /File [\w\-\/]*\/libs\/interpreter-lib\/test\/assets\/parsing-util\/extractDocumentFromFile\/invalid-missing-file\.jv does not exist\./,
+        );
+        expect(logger.getLogs().debugLogs).toHaveLength(0);
+        expect(logger.getLogs().diagnosticLogs).toHaveLength(0);
+      }
+    });
+  });
+});
diff --git a/libs/interpreter-lib/test/assets/parsing-util/extractDocumentFromFile/invalid-extension.lv b/libs/interpreter-lib/test/assets/parsing-util/extractDocumentFromFile/invalid-extension.lv
new file mode 100644
index 000000000..70f3794d1
--- /dev/null
+++ b/libs/interpreter-lib/test/assets/parsing-util/extractDocumentFromFile/invalid-extension.lv
@@ -0,0 +1,14 @@
+// SPDX-FileCopyrightText: 2023 Friedrich-Alexander-Universitat Erlangen-Nurnberg
+//
+// SPDX-License-Identifier: AGPL-3.0-only
+
+pipeline TestPipeline {
+
+  block TestExtractor oftype TestFileExtractor {
+  }
+
+  block TestLoader oftype TestFileLoader {
+  }
+
+  TestExtractor -> TestLoader;
+}
diff --git a/libs/interpreter-lib/test/assets/parsing-util/extractDocumentFromFile/valid-model.jv b/libs/interpreter-lib/test/assets/parsing-util/extractDocumentFromFile/valid-model.jv
new file mode 100644
index 000000000..70f3794d1
--- /dev/null
+++ b/libs/interpreter-lib/test/assets/parsing-util/extractDocumentFromFile/valid-model.jv
@@ -0,0 +1,14 @@
+// SPDX-FileCopyrightText: 2023 Friedrich-Alexander-Universitat Erlangen-Nurnberg
+//
+// SPDX-License-Identifier: AGPL-3.0-only
+
+pipeline TestPipeline {
+
+  block TestExtractor oftype TestFileExtractor {
+  }
+
+  block TestLoader oftype TestFileLoader {
+  }
+
+  TestExtractor -> TestLoader;
+}
diff --git a/libs/interpreter-lib/test/assets/parsing-util/extractDocumentFromString/invalid-model.jv b/libs/interpreter-lib/test/assets/parsing-util/extractDocumentFromString/invalid-model.jv
new file mode 100644
index 000000000..7abf8d0f8
--- /dev/null
+++ b/libs/interpreter-lib/test/assets/parsing-util/extractDocumentFromString/invalid-model.jv
@@ -0,0 +1,15 @@
+// SPDX-FileCopyrightText: 2023 Friedrich-Alexander-Universitat Erlangen-Nurnberg
+//
+// SPDX-License-Identifier: AGPL-3.0-only
+
+pipeline TestPipeline {
+
+  block TestExtractor oftype TestFileExtractor {
+  }
+
+  block TestLoader oftype TestFileLoader {
+  }
+  sta
+
+  TestExtractor -> TestLoader;
+}
diff --git a/libs/interpreter-lib/test/assets/parsing-util/extractDocumentFromString/valid-model.jv b/libs/interpreter-lib/test/assets/parsing-util/extractDocumentFromString/valid-model.jv
new file mode 100644
index 000000000..70f3794d1
--- /dev/null
+++ b/libs/interpreter-lib/test/assets/parsing-util/extractDocumentFromString/valid-model.jv
@@ -0,0 +1,14 @@
+// SPDX-FileCopyrightText: 2023 Friedrich-Alexander-Universitat Erlangen-Nurnberg
+//
+// SPDX-License-Identifier: AGPL-3.0-only
+
+pipeline TestPipeline {
+
+  block TestExtractor oftype TestFileExtractor {
+  }
+
+  block TestLoader oftype TestFileLoader {
+  }
+
+  TestExtractor -> TestLoader;
+}
diff --git a/libs/interpreter-lib/test/assets/parsing-util/validateDocument/invalid-wrong-loader-type.jv b/libs/interpreter-lib/test/assets/parsing-util/validateDocument/invalid-wrong-loader-type.jv
new file mode 100644
index 000000000..037e75012
--- /dev/null
+++ b/libs/interpreter-lib/test/assets/parsing-util/validateDocument/invalid-wrong-loader-type.jv
@@ -0,0 +1,14 @@
+// SPDX-FileCopyrightText: 2023 Friedrich-Alexander-Universitat Erlangen-Nurnberg
+//
+// SPDX-License-Identifier: AGPL-3.0-only
+
+pipeline TestPipeline {
+
+  block TestExtractor oftype TestFileExtractor {
+  }
+
+  block TestLoader oftype TestTableLoader {
+  }
+
+  TestExtractor -> TestLoader;
+}
diff --git a/libs/interpreter-lib/test/assets/parsing-util/validateDocument/valid-document.jv b/libs/interpreter-lib/test/assets/parsing-util/validateDocument/valid-document.jv
new file mode 100644
index 000000000..70f3794d1
--- /dev/null
+++ b/libs/interpreter-lib/test/assets/parsing-util/validateDocument/valid-document.jv
@@ -0,0 +1,14 @@
+// SPDX-FileCopyrightText: 2023 Friedrich-Alexander-Universitat Erlangen-Nurnberg
+//
+// SPDX-License-Identifier: AGPL-3.0-only
+
+pipeline TestPipeline {
+
+  block TestExtractor oftype TestFileExtractor {
+  }
+
+  block TestLoader oftype TestFileLoader {
+  }
+
+  TestExtractor -> TestLoader;
+}
diff --git a/libs/interpreter-lib/test/assets/parsing-util/validateDocument/valid-simplify-warning.jv b/libs/interpreter-lib/test/assets/parsing-util/validateDocument/valid-simplify-warning.jv
new file mode 100644
index 000000000..f7116f9ae
--- /dev/null
+++ b/libs/interpreter-lib/test/assets/parsing-util/validateDocument/valid-simplify-warning.jv
@@ -0,0 +1,19 @@
+// SPDX-FileCopyrightText: 2023 Friedrich-Alexander-Universitat Erlangen-Nurnberg
+//
+// SPDX-License-Identifier: AGPL-3.0-only
+
+pipeline TestPipeline {
+
+  block TestExtractor oftype TestFileExtractor {
+  }
+
+  block TestPropertyBlock oftype TestProperty {
+    textProperty: "Test";
+    integerProperty: 20 + 20;
+  }
+
+  block TestLoader oftype TestTableLoader {
+  }
+
+  TestExtractor -> TestPropertyBlock -> TestLoader;
+}