test: Add unit tests for error handling utilities

core/util/errors.test.ts

@@ -0,0 +1,39 @@
+import { ContinueError, ContinueErrorReason, getRootCause } from "./errors";
+
+describe("getRootCause", () => {
+  test("should return the error itself when it has no cause", () => {
+    const err = new Error("This is an error");
+    expect(getRootCause(err)).toBe(err);
+  });
+
+  test("should return the root cause of a nested error", () => {
+    const rootCause = new Error("This is the root cause");
+    const err = new Error("This is an error", { cause: rootCause });
+    expect(getRootCause(err)).toBe(rootCause);
+  });
+
+  test("should return the root cause of a deeply nested error", () => {
+    const rootCause = new Error("This is the root cause");
+    const err1 = new Error("This is the first error", { cause: rootCause });
+    const err2 = new Error("This is the second error", { cause: err1 });
+    expect(getRootCause(err2)).toBe(rootCause);
+  });
+});
+
+describe("ContinueError", () => {
+  test("should correctly set the reason and message", () => {
+    const reason = ContinueErrorReason.Unspecified;
+    const message = "This is a test error";
+    const err = new ContinueError(reason, message);
+    expect(err.reason).toBe(reason);
+    expect(err.message).toBe(message);
+    expect(err.name).toBe("ContinueError");
+  });
+
+  test("should have an empty message if none is provided", () => {
+    const reason = ContinueErrorReason.Unspecified;
+    const err = new ContinueError(reason);
+    expect(err.reason).toBe(reason);
+    expect(err.message).toBe("");
+  });
+});