diff --git a/tests/ScanAndValidateParseTrees.spec.ts b/tests/ScanAndValidateParseTrees.spec.ts
new file mode 100644
index 0000000..12b1a86
--- /dev/null
+++ b/tests/ScanAndValidateParseTrees.spec.ts
@@ -0,0 +1,7 @@
+import { File } from './support/infrastructure/File';
+import scanAndValidateParseTrees from './support/scanAndValidateParseTrees';
+
+const INPUT_DIRECTORY: File = new File(__dirname, "../proleap-vb6/src/test/resources");
+const DIRECTORIES_EXCLUDED: File[] = [ new File(INPUT_DIRECTORY.getAbsolutePath(), "io/proleap/vb6/asg") ];
+
+scanAndValidateParseTrees(INPUT_DIRECTORY, (directory) => Boolean(DIRECTORIES_EXCLUDED.find(d => d.equals(directory))));
diff --git a/tests/support/ThrowingErrorListener.ts b/tests/support/ThrowingErrorListener.ts
new file mode 100644
index 0000000..5c721f2
--- /dev/null
+++ b/tests/support/ThrowingErrorListener.ts
@@ -0,0 +1,8 @@
+import { VbParserError } from './VbParserError';
+import { ANTLRErrorListener, Recognizer, RecognitionException } from "antlr4ts";
+
+export class ThrowingErrorListener<TSymbol> implements ANTLRErrorListener<TSymbol> {
+    syntaxError<T extends TSymbol>(recognizer: Recognizer<T, any>, offendingSymbol: T | undefined, line: number, charPositionInLine: number, msg: string, e: RecognitionException | undefined): void {
+        throw new VbParserError("syntax error in line " + line + ":" + charPositionInLine + " " + msg);
+    }
+}
diff --git a/tests/support/VbParseTestRunner.ts b/tests/support/VbParseTestRunner.ts
new file mode 100644
index 0000000..a4d096a
--- /dev/null
+++ b/tests/support/VbParseTestRunner.ts
@@ -0,0 +1,82 @@
+/**
+ * VB6 parse runner for Jest tests.
+ */
+
+import { createLogger, ILogger } from './infrastructure/Logger';
+import { File } from './infrastructure/File';
+import { readFileSync } from 'fs';
+const readFileToString = (path: string): string => readFileSync(path, {encoding: 'utf8'});
+import { StartRuleContext, VisualBasic6Parser, VisualBasic6Lexer } from '../../index';
+import { ANTLRInputStream, CommonTokenStream } from "antlr4ts";
+import { cleanFileTree } from './cleanFileTree';
+import { IVbParserParams, VbParserParams } from './VbParserParams';
+import { ThrowingErrorListener } from './ThrowingErrorListener';
+import { isClazzModule, isStandardModule, isForm } from './vbFileTypes'
+
+export interface IVbParseTestRunner  {
+    parseFile(inputFile: File): void;
+}
+
+const LOG: ILogger = createLogger(__filename);
+
+const TREE_SUFFIX: string = ".tree";
+
+export class VbParseTestRunner 
+    implements IVbParseTestRunner {
+
+	protected createDefaultParams(): IVbParserParams {
+		return new VbParserParams();
+	}
+
+	protected doCompareParseTree(treeFile: File, startRule: StartRuleContext, parser: VisualBasic6Parser): void {
+		const treeFileData: string = readFileToString(treeFile.getAbsolutePath());
+
+		if (treeFileData && treeFileData.length) {
+			LOG.info(`Comparing parse tree with file ${treeFile.getName()}.`);
+
+            it(treeFile.getName(), () => {
+                const inputFileTree: string = startRule.toStringTree(parser);
+                const cleanedInputFileTree: string = cleanFileTree(inputFileTree);
+                const cleanedTreeFileData: string = cleanFileTree(treeFileData);
+                
+                expect(cleanedInputFileTree).toBe(cleanedTreeFileData);
+            });
+		} else {
+			LOG.info(`Ignoring empty parse tree file ${treeFile.getName()}.`);
+		}
+	}
+
+	protected doParse(inputFile: File, params: IVbParserParams): void {
+		LOG.info(`Parsing file ${inputFile.getName()}.`);
+
+        const lexer: VisualBasic6Lexer = new VisualBasic6Lexer(new ANTLRInputStream(readFileToString(inputFile.getAbsolutePath())));
+
+		if (!params.getIgnoreSyntaxErrors()) {
+			lexer.removeErrorListeners();
+			lexer.addErrorListener(new ThrowingErrorListener());
+		}
+
+		const tokens: CommonTokenStream = new CommonTokenStream(lexer);
+		const parser: VisualBasic6Parser = new VisualBasic6Parser(tokens);
+
+		if (!params.getIgnoreSyntaxErrors()) {
+			parser.removeErrorListeners();
+			parser.addErrorListener(new ThrowingErrorListener());
+		}
+
+		const startRule: StartRuleContext = parser.startRule();
+		const treeFile: File = new File(inputFile.getAbsolutePath() + TREE_SUFFIX);
+
+		if (treeFile.exists()) {
+			this.doCompareParseTree(treeFile, startRule, parser);
+		}
+	}
+
+    parseFile(inputFile: File): void {
+		if (!isClazzModule(inputFile) && !isStandardModule(inputFile) && !isForm(inputFile)) {
+			LOG.info(`Ignoring file ${inputFile.getName()}.`);
+		} else {
+			this.doParse(inputFile, this.createDefaultParams());
+		}
+    }
+}
diff --git a/tests/support/VbParserError.ts b/tests/support/VbParserError.ts
new file mode 100644
index 0000000..ec9937e
--- /dev/null
+++ b/tests/support/VbParserError.ts
@@ -0,0 +1,5 @@
+export class VbParserError extends Error {
+    constructor(message: string) {
+        super(message)
+    }
+}
diff --git a/tests/support/VbParserParams.ts b/tests/support/VbParserParams.ts
new file mode 100644
index 0000000..7ff72ac
--- /dev/null
+++ b/tests/support/VbParserParams.ts
@@ -0,0 +1,9 @@
+export interface IVbParserParams {
+    getIgnoreSyntaxErrors(): boolean;
+}
+
+export class VbParserParams implements IVbParserParams {
+    getIgnoreSyntaxErrors(): boolean {
+        return false;
+    }
+}
diff --git a/tests/support/cleanFileTree.ts b/tests/support/cleanFileTree.ts
new file mode 100644
index 0000000..9fba4b3
--- /dev/null
+++ b/tests/support/cleanFileTree.ts
@@ -0,0 +1,10 @@
+/**
+ * To be removed, as soon as the grammar does not require NEWLINEs and WS
+ * anymore
+ */
+export function cleanFileTree(input: string): string {
+    const inputNoEscapedNewline: string = input.replace(/\\r/g, "").replace(/\\n/g, "").replace(/\\t/g, "");;
+    const inputNoNewline: string = inputNoEscapedNewline.replace(/\r?\n|\r/g, "");
+    const inputReducedWhitespace: string = inputNoNewline.replace(/[\s]+/g, " ").replace(/[\s]+\)/, ")");
+    return inputReducedWhitespace;
+}
diff --git a/tests/support/infrastructure/File.ts b/tests/support/infrastructure/File.ts
new file mode 100644
index 0000000..9eafc2e
--- /dev/null
+++ b/tests/support/infrastructure/File.ts
@@ -0,0 +1,50 @@
+import * as path from 'path';
+import * as fs from 'fs';
+
+export class File {
+    private _path: string;
+    
+    constructor(value: string, ...additionalPathPieces: string[]) {
+        if (additionalPathPieces && additionalPathPieces.length) {
+            this._path = path.resolve(process.cwd(), value, ...additionalPathPieces);
+        } else {
+            this._path = path.resolve(process.cwd(), value);
+        }
+    }
+
+    getName(): string {
+        return path.basename(this._path);
+    }
+
+    getAbsolutePath(): string {
+        return path.resolve(this._path);
+    }
+
+    exists(): boolean {
+        return fs.existsSync(this._path);
+    }
+
+    removeExtension(): string {
+        return path.basename(this._path, path.extname(this._path));
+    }
+
+    equals(other: File): boolean {
+        return this.getAbsolutePath() === other.getAbsolutePath();
+    }
+
+    isDirectory(): boolean {
+        return fs.statSync(this._path).isDirectory();
+    }
+
+    isFile(): boolean {
+        return fs.statSync(this._path).isFile();
+    }
+
+    listFiles(): File[] {
+        return fs.readdirSync(this._path).map(e => new File(this._path, e))
+    }
+
+    getParent(): string {
+        return path.dirname(this._path);
+    }
+}
diff --git a/tests/support/infrastructure/Logger.ts b/tests/support/infrastructure/Logger.ts
new file mode 100644
index 0000000..50a0dea
--- /dev/null
+++ b/tests/support/infrastructure/Logger.ts
@@ -0,0 +1,27 @@
+export interface ILogger {
+    info(message: string): void;
+}
+
+export class ConsoleLogger implements ILogger {
+    private _name: string;
+
+    constructor(name: string) {
+        this._name = name;
+    }
+
+    info(message: string): void {
+        console.log(`${this._name}: ${message}`);
+    }
+}
+
+export class NullLogger implements ILogger {
+    constructor(name: string) {
+    }
+
+    info(message: string): void {
+    }
+}
+
+export function createLogger(name: string): ILogger {
+    return new NullLogger(name);
+}
diff --git a/tests/support/scanAndValidateParseTrees.ts b/tests/support/scanAndValidateParseTrees.ts
new file mode 100644
index 0000000..7f45ab8
--- /dev/null
+++ b/tests/support/scanAndValidateParseTrees.ts
@@ -0,0 +1,35 @@
+import { File } from './infrastructure/File';
+import { isClazzModule, isStandardModule, isForm } from './vbFileTypes';
+import { IVbParseTestRunner, VbParseTestRunner } from './VbParseTestRunner';
+
+function validateParseTrees(vb6InputFile: File): void {       
+    const runner: IVbParseTestRunner = new VbParseTestRunner();
+    runner.parseFile(vb6InputFile);
+}
+
+export default function scanAndValidateParseTrees(inputDirectory: File, exclusionFilter: (file: File) => boolean) {
+    if (inputDirectory.isDirectory() && !exclusionFilter(inputDirectory)) {
+        describe(inputDirectory.getName(), () => {
+            // for each of the files in the directory
+            inputDirectory.listFiles().forEach(inputDirectoryFile => {
+                // if the file is a VB6 relevant file
+                if (
+                    inputDirectoryFile.isFile() 
+                    && (isClazzModule(inputDirectoryFile)
+                        || isStandardModule(inputDirectoryFile) 
+                        || isForm(inputDirectoryFile))) {
+                    validateParseTrees(inputDirectoryFile);
+                }
+                // else, if the file is a relevant directory
+                else if (inputDirectoryFile.isDirectory()) {
+                    const subInputDirectory: File = inputDirectoryFile;
+                    const subInputDirectoryName: string = subInputDirectory.getName();
+
+                    if ("."!==subInputDirectoryName && ".."!==subInputDirectoryName) {
+                        scanAndValidateParseTrees(subInputDirectory, exclusionFilter);
+                    }
+                }
+            });
+        });
+    }
+}
diff --git a/tests/support/vbFileTypes.ts b/tests/support/vbFileTypes.ts
new file mode 100644
index 0000000..141edf6
--- /dev/null
+++ b/tests/support/vbFileTypes.ts
@@ -0,0 +1,17 @@
+import { File } from './infrastructure/File';
+import { extname as getFileExtension } from 'path';
+
+export function isClazzModule(inputFile: File): boolean {
+    const extension: string = getFileExtension(inputFile.getName()).toLowerCase();
+    return ".cls" === extension;
+}
+
+export function isStandardModule(inputFile: File): boolean {
+    const extension: string = getFileExtension(inputFile.getName()).toLowerCase();
+    return ".bas" === extension;
+}
+
+export function isForm(inputFile: File): boolean {
+    const extension: string = getFileExtension(inputFile.getName()).toLowerCase();
+    return ".frm" === extension;
+}