From 5f8de423f190bbb79a62f804151bc24824fa32d8 Mon Sep 17 00:00:00 2001 From: "Matt A. Tobin" Date: Fri, 2 Feb 2018 04:16:08 -0500 Subject: Add m-esr52 at 52.6.0 --- js/src/tests/ecma_6/Generators/runtime.js | 132 ++++++++++++++++++++++++++++++ 1 file changed, 132 insertions(+) create mode 100644 js/src/tests/ecma_6/Generators/runtime.js (limited to 'js/src/tests/ecma_6/Generators/runtime.js') diff --git a/js/src/tests/ecma_6/Generators/runtime.js b/js/src/tests/ecma_6/Generators/runtime.js new file mode 100644 index 000000000..c4d3bb6a6 --- /dev/null +++ b/js/src/tests/ecma_6/Generators/runtime.js @@ -0,0 +1,132 @@ +// This file was written by Andy Wingo and originally +// contributed to V8 as generators-runtime.js, available here: +// +// http://code.google.com/p/v8/source/browse/branches/bleeding_edge/test/mjsunit/harmony/generators-runtime.js + +// Test aspects of the generator runtime. + +// See http://people.mozilla.org/~jorendorff/es6-draft.html#sec-15.19.3. + +function assertSyntaxError(str) { + assertThrowsInstanceOf(Function(str), SyntaxError); +} + + +function f() { } +function* g() { yield 1; } +var GeneratorFunctionPrototype = Object.getPrototypeOf(g); +var GeneratorFunction = GeneratorFunctionPrototype.constructor; +var GeneratorObjectPrototype = GeneratorFunctionPrototype.prototype; + + +// A generator function should have the same set of properties as any +// other function. +function TestGeneratorFunctionInstance() { + var f_own_property_names = Object.getOwnPropertyNames(f); + var g_own_property_names = Object.getOwnPropertyNames(g); + + f_own_property_names.sort(); + g_own_property_names.sort(); + + assertDeepEq(f_own_property_names, g_own_property_names); + var i; + for (i = 0; i < f_own_property_names.length; i++) { + var prop = f_own_property_names[i]; + var f_desc = Object.getOwnPropertyDescriptor(f, prop); + var g_desc = Object.getOwnPropertyDescriptor(g, prop); + assertEq(f_desc.configurable, g_desc.configurable, prop); + assertEq(f_desc.writable, g_desc.writable, prop); + assertEq(f_desc.enumerable, g_desc.enumerable, prop); + } +} +TestGeneratorFunctionInstance(); + + +// Generators have an additional object interposed in the chain between +// themselves and Function.prototype. +function TestGeneratorFunctionPrototype() { + // Sanity check. + assertEq(Object.getPrototypeOf(f), Function.prototype); + assertNotEq(GeneratorFunctionPrototype, Function.prototype); + assertEq(Object.getPrototypeOf(GeneratorFunctionPrototype), + Function.prototype); + assertEq(Object.getPrototypeOf(function* () {}), + GeneratorFunctionPrototype); +} +TestGeneratorFunctionPrototype(); + + +// Functions that we associate with generator objects are actually defined by +// a common prototype. +function TestGeneratorObjectPrototype() { + // %GeneratorPrototype% must inherit from %IteratorPrototype%. + var iterProto = Object.getPrototypeOf(Object.getPrototypeOf([][Symbol.iterator]())); + assertEq(Object.getPrototypeOf(GeneratorObjectPrototype), + iterProto); + assertEq(Object.getPrototypeOf((function*(){yield 1}).prototype), + GeneratorObjectPrototype); + + var expected_property_names = ["next", "return", "throw", "constructor"]; + var found_property_names = + Object.getOwnPropertyNames(GeneratorObjectPrototype); + + expected_property_names.sort(); + found_property_names.sort(); + + assertDeepEq(found_property_names, expected_property_names); + assertDeepEq(Object.getOwnPropertySymbols(GeneratorObjectPrototype), [Symbol.toStringTag]); +} +TestGeneratorObjectPrototype(); + + +// This tests the object that would be called "GeneratorFunction", if it were +// like "Function". +function TestGeneratorFunction() { + assertEq(GeneratorFunctionPrototype, GeneratorFunction.prototype); + assertTrue(g instanceof GeneratorFunction); + + assertEq(Function, Object.getPrototypeOf(GeneratorFunction)); + assertTrue(g instanceof Function); + + assertEq("function* g() { yield 1; }", g.toString()); + + // Not all functions are generators. + assertTrue(f instanceof Function); // Sanity check. + assertFalse(f instanceof GeneratorFunction); + + assertTrue((new GeneratorFunction()) instanceof GeneratorFunction); + assertTrue(GeneratorFunction() instanceof GeneratorFunction); + + assertTrue(GeneratorFunction('yield 1') instanceof GeneratorFunction); + assertTrue(GeneratorFunction('return 1') instanceof GeneratorFunction); + assertTrue(GeneratorFunction('a', 'yield a') instanceof GeneratorFunction); + assertTrue(GeneratorFunction('a', 'return a') instanceof GeneratorFunction); + assertTrue(GeneratorFunction('a', 'return a') instanceof GeneratorFunction); + assertSyntaxError("GeneratorFunction('yield', 'return yield')"); + assertTrue(GeneratorFunction('with (x) return foo;') instanceof GeneratorFunction); + assertSyntaxError("GeneratorFunction('\"use strict\"; with (x) return foo;')"); + + // Doesn't matter particularly what string gets serialized, as long + // as it contains "function*" and "yield 10". + assertEq(GeneratorFunction('yield 10').toString(), + "function* anonymous() {\nyield 10\n}"); +} +TestGeneratorFunction(); + + +function TestPerGeneratorPrototype() { + assertNotEq((function*(){}).prototype, (function*(){}).prototype); + assertNotEq((function*(){}).prototype, g.prototype); + assertEq(typeof GeneratorFunctionPrototype, "object"); + assertEq(g.prototype.__proto__.constructor, GeneratorFunctionPrototype, "object"); + assertEq(Object.getPrototypeOf(g.prototype), GeneratorObjectPrototype); + assertFalse(g.prototype instanceof Function); + assertEq(typeof (g.prototype), "object"); + + assertDeepEq(Object.getOwnPropertyNames(g.prototype), []); +} +TestPerGeneratorPrototype(); + + +if (typeof reportCompare == "function") + reportCompare(true, true); -- cgit v1.2.3