Initial Sample.

graphql-subscription/node_modules/optimism/src/tests/exceptions.ts

@@ -0,0 +1,76 @@
+import * as assert from "assert";
+import { wrap } from "../index.js";
+
+describe("exceptions", function () {
+  it("should be cached", function () {
+    const error = new Error("expected");
+    let threw = false;
+    function throwOnce() {
+      if (!threw) {
+        threw = true;
+        throw error;
+      }
+      return "already threw";
+    }
+
+    const wrapper = wrap(throwOnce);
+
+    try {
+      wrapper();
+      throw new Error("unreached");
+    } catch (e) {
+      assert.strictEqual(e, error);
+    }
+
+    try {
+      wrapper();
+      throw new Error("unreached");
+    } catch (e) {
+      assert.strictEqual(e, error);
+    }
+
+    wrapper.dirty();
+    assert.strictEqual(wrapper(), "already threw");
+    assert.strictEqual(wrapper(), "already threw");
+    wrapper.dirty();
+    assert.strictEqual(wrapper(), "already threw");
+  });
+
+  it("should memoize a throwing fibonacci function", function () {
+    const fib = wrap((n: number) => {
+      if (n < 2) throw n;
+      try {
+        fib(n - 1);
+      } catch (minusOne: any) {
+        try {
+          fib(n - 2);
+        } catch (minusTwo: any) {
+          throw minusOne + minusTwo;
+        }
+      }
+      throw new Error("unreached");
+    });
+
+    function check(n: number, expected: number) {
+      try {
+        fib(n);
+        throw new Error("unreached");
+      } catch (result) {
+        assert.strictEqual(result, expected);
+      }
+    }
+
+    check(78, 8944394323791464);
+    check(68, 72723460248141);
+    check(58, 591286729879);
+    check(48, 4807526976);
+    fib.dirty(28);
+    check(38, 39088169);
+    check(28, 317811);
+    check(18, 2584);
+    check(8,  21);
+    fib.dirty(20);
+    check(78, 8944394323791464);
+    check(10, 55);
+  });
+});