Libraries: Move to Userland/Libraries/

Userland/Libraries/LibJS/Tests/loops/break-basic.js

@@ -0,0 +1,30 @@
+test("Toplevel break inside loop", () => {
+    var j = 0;
+    for (var i = 0; i < 9; ++i) {
+        break;
+        ++j;
+    }
+    expect(j).toBe(0);
+});
+
+test("break inside sub-blocks", () => {
+    var j = 0;
+    for (var i = 0; i < 9; ++i) {
+        if (j == 4) {
+            break;
+        }
+        ++j;
+    }
+    expect(j).toBe(4);
+});
+
+test("break inside curly sub-blocks", () => {
+    var j = 0;
+    for (var i = 0; i < 9; ++i) {
+        if (j == 4) {
+            break;
+        }
+        ++j;
+    }
+    expect(j).toBe(4);
+});

Userland/Libraries/LibJS/Tests/loops/continue-basic.js

@@ -0,0 +1,10 @@
+test("basic functionality", () => {
+    var j = 0;
+    for (var i = 0; i < 9; ++i) {
+        if (i == 3) {
+            continue;
+        }
+        ++j;
+    }
+    expect(j).toBe(8);
+});

Userland/Libraries/LibJS/Tests/loops/do-while-basic.js

@@ -0,0 +1,24 @@
+test("basic functionality", () => {
+    let number = 0;
+    do {
+        number++;
+    } while (number < 9);
+    expect(number).toBe(9);
+});
+
+test("no braces", () => {
+    let number = 0;
+    do number++;
+    while (number < 3);
+    expect(number).toBe(3);
+});
+
+test("exception in test expression", () => {
+    expect(() => {
+        do {} while (foo);
+    }).toThrow(ReferenceError);
+});
+
+test("automatic semicolon insertion", () => {
+    expect("do {} while (false) foo").toEval();
+});

Userland/Libraries/LibJS/Tests/loops/for-basic.js

@@ -0,0 +1,15 @@
+test("basic functionality", () => {
+    let a = [];
+    for (let i = 0; i < 3; ++i) {
+        a.push(i);
+    }
+    expect(a).toEqual([0, 1, 2]);
+});
+
+test("only condition", () => {
+    let a = [];
+    for (; a.length < 3; ) {
+        a.push("x");
+    }
+    expect(a).toEqual(["x", "x", "x"]);
+});

Userland/Libraries/LibJS/Tests/loops/for-head-errors.js

@@ -0,0 +1,23 @@
+test("using undefined variable in initializer", () => {
+    expect(() => {
+        for (let i = foo; i < 100; ++i) {}
+    }).toThrowWithMessage(ReferenceError, "'foo' is not defined");
+});
+
+test("using undefined variable in condition", () => {
+    expect(() => {
+        for (let i = 0; i < foo; ++i) {}
+    }).toThrowWithMessage(ReferenceError, "'foo' is not defined");
+});
+
+test("using undefined variable in updater", () => {
+    let loopCount = 0;
+
+    expect(() => {
+        for (let i = 0; i < 100; ++foo) {
+            loopCount++;
+        }
+    }).toThrowWithMessage(ReferenceError, "'foo' is not defined");
+
+    expect(loopCount).toBe(1);
+});

Userland/Libraries/LibJS/Tests/loops/for-in-basic.js

@@ -0,0 +1,45 @@
+test("iterate through empty string", () => {
+    const a = [];
+    for (const property in "") {
+        a.push(property);
+    }
+    expect(a).toEqual([]);
+});
+
+test("iterate through number", () => {
+    const a = [];
+    for (const property in 123) {
+        a.push(property);
+    }
+    expect(a).toEqual([]);
+});
+
+test("iterate through empty object", () => {
+    const a = [];
+    for (const property in {}) {
+        a.push(property);
+    }
+    expect(a).toEqual([]);
+});
+
+test("iterate through string", () => {
+    const a = [];
+    for (const property in "hello") {
+        a.push(property);
+    }
+    expect(a).toEqual(["0", "1", "2", "3", "4"]);
+});
+
+test("iterate through object", () => {
+    const a = [];
+    for (const property in { a: 1, b: 2, c: 2 }) {
+        a.push(property);
+    }
+    expect(a).toEqual(["a", "b", "c"]);
+});
+
+test("use already-declared variable", () => {
+    var property;
+    for (property in "abc");
+    expect(property).toBe("2");
+});

Userland/Libraries/LibJS/Tests/loops/for-no-curlies.js

@@ -0,0 +1,5 @@
+test("basic functionality", () => {
+    let number = 0;
+    for (let i = 0; i < 3; ++i) for (let j = 0; j < 3; ++j) number++;
+    expect(number).toBe(9);
+});

Userland/Libraries/LibJS/Tests/loops/for-of-basic.js

@@ -0,0 +1,100 @@
+describe("correct behavior", () => {
+    test("iterate through array", () => {
+        const a = [];
+        for (const num of [1, 2, 3]) {
+            a.push(num);
+        }
+        expect(a).toEqual([1, 2, 3]);
+    });
+
+    test("iterate through string", () => {
+        const a = [];
+        for (const char of "hello") {
+            a.push(char);
+        }
+        expect(a).toEqual(["h", "e", "l", "l", "o"]);
+    });
+
+    test("iterate through string object", () => {
+        const a = [];
+        for (const char of new String("hello")) {
+            a.push(char);
+        }
+        expect(a).toEqual(["h", "e", "l", "l", "o"]);
+    });
+
+    test("use already-declared variable", () => {
+        var char;
+        for (char of "abc");
+        expect(char).toBe("c");
+    });
+
+    test("respects custom Symbol.iterator method", () => {
+        const o = {
+            [Symbol.iterator]() {
+                return {
+                    i: 0,
+                    next() {
+                        if (this.i++ == 3) {
+                            return { done: true };
+                        }
+                        return { value: this.i, done: false };
+                    },
+                };
+            },
+        };
+
+        const a = [];
+        for (const k of o) {
+            a.push(k);
+        }
+
+        expect(a).toEqual([1, 2, 3]);
+    });
+
+    test("loops through custom iterator if there is an exception thrown part way through", () => {
+        // This tests against the way custom iterators used to be implemented, where the values
+        // were all collected at once before the for-of body was executed, instead of getting
+        // the values one at a time
+        const o = {
+            [Symbol.iterator]() {
+                return {
+                    i: 0,
+                    next() {
+                        if (this.i++ === 3) {
+                            throw new Error();
+                        }
+                        return { value: this.i };
+                    },
+                };
+            },
+        };
+
+        const a = [];
+
+        try {
+            for (let k of o) {
+                a.push(k);
+            }
+            expect().fail();
+        } catch (e) {
+            expect(a).toEqual([1, 2, 3]);
+        }
+    });
+});
+
+describe("errors", () => {
+    test("right hand side is a primitive", () => {
+        expect(() => {
+            for (const _ of 123) {
+            }
+        }).toThrowWithMessage(TypeError, "123 is not iterable");
+    });
+
+    test("right hand side is an object", () => {
+        expect(() => {
+            for (const _ of { foo: 1, bar: 2 }) {
+            }
+        }).toThrowWithMessage(TypeError, "[object Object] is not iterable");
+    });
+});

Userland/Libraries/LibJS/Tests/loops/for-scopes.js

@@ -0,0 +1,18 @@
+test("var in for head", () => {
+    for (var v = 5; false; );
+    expect(v).toBe(5);
+});
+
+test("let in for head", () => {
+    for (let l = 5; false; );
+    expect(() => {
+        l;
+    }).toThrowWithMessage(ReferenceError, "'l' is not defined");
+});
+
+test("const in for head", () => {
+    for (const c = 5; false; );
+    expect(() => {
+        c;
+    }).toThrowWithMessage(ReferenceError, "'c' is not defined");
+});

Userland/Libraries/LibJS/Tests/loops/while-basic.js

@@ -0,0 +1,25 @@
+test("basic functionality", () => {
+    let number = 0;
+    while (number < 9) {
+        number++;
+    }
+    expect(number).toBe(9);
+});
+
+test("no braces", () => {
+    let number = 0;
+    while (number < 3) number++;
+    expect(number).toBe(3);
+});
+
+test("does not loop when initially false", () => {
+    while (false) {
+        expect().fail();
+    }
+});
+
+test("exception in test expression", () => {
+    expect(() => {
+        while (foo);
+    }).toThrow(ReferenceError);
+});