From 6ca4cadf1a0a077f7ab600eca65d297cbe47f61d Mon Sep 17 00:00:00 2001
From: Artem Zakharchenko <kettanaito@gmail.com>
Date: Wed, 8 May 2024 14:25:12 +0200
Subject: [PATCH] test: add unit tests for "InternalError"

---
 src/core/utils/internal/devUtils.test.ts | 21 +++++++++++++++++++++
 src/core/utils/internal/devUtils.ts      | 11 ++++++++++-
 2 files changed, 31 insertions(+), 1 deletion(-)
 create mode 100644 src/core/utils/internal/devUtils.test.ts

diff --git a/src/core/utils/internal/devUtils.test.ts b/src/core/utils/internal/devUtils.test.ts
new file mode 100644
index 000000000..76dd20192
--- /dev/null
+++ b/src/core/utils/internal/devUtils.test.ts
@@ -0,0 +1,21 @@
+import { InternalError } from './devUtils'
+
+describe(InternalError, () => {
+  it('creates an InternalError instance', () => {
+    const error = new InternalError('Message')
+
+    expect(error.name).toBe('InternalError')
+    expect(error.message).toBe('Message')
+    expect(error.toString()).toBe('InternalError: Message')
+    expect(error.stack).toMatch(/\w+/)
+  })
+
+  it('passes the identity check', () => {
+    const error = new InternalError('Message')
+    expect(error instanceof InternalError).toBe(true)
+    expect(error instanceof Error).toBe(true)
+
+    const extraneousError = new Error('Message')
+    expect(extraneousError).not.toBeInstanceOf(InternalError)
+  })
+})
diff --git a/src/core/utils/internal/devUtils.ts b/src/core/utils/internal/devUtils.ts
index e39b69264..08e5005e3 100644
--- a/src/core/utils/internal/devUtils.ts
+++ b/src/core/utils/internal/devUtils.ts
@@ -30,6 +30,15 @@ export const devUtils = {
   error,
 }
 
+/**
+ * Internal error instance.
+ * Used to differentiate the library errors that must be forwarded
+ * to the user from the unhandled exceptions. Use this if you don't
+ * wish for the error to be coerced to a 500 fallback response.
+ */
 export class InternalError extends Error {
-  //
+  constructor(message: string) {
+    super(message)
+    this.name = 'InternalError'
+  }
 }