integration tests

core/shared/errors/ValidationError.ts

@@ -0,0 +1,16 @@
+/**
+ * Validation Error
+ * 
+ * Thrown when input validation fails.
+ */
+
+export class ValidationError extends Error {
+  readonly type = 'domain';
+  readonly context = 'validation';
+  readonly kind = 'validation';
+
+  constructor(message: string) {
+    super(message);
+    this.name = 'ValidationError';
+  }
+}