LibJS: Implement Iterator.prototype.toArray

Userland/Libraries/LibJS/Tests/builtins/Iterator/Iterator.prototype.toArray.js

@@ -0,0 +1,58 @@
+describe("errors", () => {
+    test("iterator's next method throws", () => {
+        function TestError() {}
+
+        class TestIterator extends Iterator {
+            next() {
+                throw new TestError();
+            }
+        }
+
+        expect(() => {
+            new TestIterator().toArray();
+        }).toThrow(TestError);
+    });
+
+    test("value returned by iterator's next method throws", () => {
+        function TestError() {}
+
+        class TestIterator extends Iterator {
+            next() {
+                return {
+                    done: false,
+                    get value() {
+                        throw new TestError();
+                    },
+                };
+            }
+        }
+
+        expect(() => {
+            new TestIterator().toArray();
+        }).toThrow(TestError);
+    });
+});
+
+describe("normal behavior", () => {
+    test("length is 0", () => {
+        expect(Iterator.prototype.toArray).toHaveLength(0);
+    });
+
+    test("empty list", () => {
+        function* generator() {}
+
+        const result = generator().toArray();
+        expect(result).toEqual([]);
+    });
+
+    test("non-empty list", () => {
+        function* generator() {
+            yield 1;
+            yield 2;
+            yield 3;
+        }
+
+        const result = generator().toArray();
+        expect(result).toEqual([1, 2, 3]);
+    });
+});