Tests for ES6 class syntax declarations On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". PASS constructorCallCount:::0 PASS A.someStaticMethod():::staticMethodValue PASS A.someStaticGetter:::getterValue PASS setterValue = undefined; A.someStaticSetter = 123; setterValue:::123 PASS (new A).someInstanceMethod():::instanceMethodValue PASS constructorCallCount:::1 PASS (new A).someGetter:::getterValue PASS constructorCallCount:::2 PASS (new A).someGetter:::getterValue PASS setterValue = undefined; (new A).someSetter = 789; setterValue:::789 PASS (new A).__proto__:::A.prototype PASS A.prototype.constructor:::A PASS class:::SyntaxError: Unexpected end of script PASS class [:::SyntaxError: Unexpected token '[' PASS class {:::SyntaxError: Class statements must have a name. PASS class X {:::SyntaxError: Unexpected end of script PASS class X { ( }:::SyntaxError: Unexpected token '(' PASS class X {} PASS class X { constructor() {} constructor() {} }:::SyntaxError: Cannot declare multiple constructors in a single class. PASS class X { get constructor() {} }:::SyntaxError: Cannot declare a getter or setter named 'constructor'. PASS class X { set constructor() {} }:::SyntaxError: Cannot declare a getter or setter named 'constructor'. PASS class X { ['constructor']() {} } PASS class X { ['constructor']() { throw 'unreached' } }; new X PASS class X { constructor() {} static constructor() { return staticMethodValue; } } PASS class X { constructor() {} static constructor() { return staticMethodValue; } }; X.constructor():::staticMethodValue PASS class X { constructor() {} static get constructor() { return staticMethodValue; } } PASS class X { constructor() {} static get constructor() { return staticMethodValue; } }; X.constructor:::staticMethodValue PASS class X { constructor() {} static prototype() {} }:::SyntaxError: Cannot declare a static method named 'prototype'. PASS class X { constructor() {} static get prototype() {} }:::SyntaxError: Cannot declare a static method named 'prototype'. PASS class X { constructor() {} static set prototype() {} }:::SyntaxError: Cannot declare a static method named 'prototype'. PASS class X { constructor() {} static get ['prototype']() {} }:::TypeError: Attempting to change configurable attribute of unconfigurable property. PASS class X { constructor() {} static set ['prototype'](x) {} }:::TypeError: Attempting to change configurable attribute of unconfigurable property. PASS class X { constructor() {} prototype() { return instanceMethodValue; } } PASS class X { constructor() {} get prototype() { return instanceMethodValue; } } PASS class X { constructor() {} set prototype(x) { } } PASS class X { constructor() {} prototype() { return instanceMethodValue; } }; (new X).prototype():::instanceMethodValue PASS class X { constructor() {} set foo(a) {} } PASS class X { constructor() {} set foo({x, y}) {} } PASS class X { constructor() {} set foo() {} }:::SyntaxError: Unexpected token ')'. setter functions must have one parameter. PASS class X { constructor() {} set foo(a, b) {} }:::SyntaxError: Unexpected token ','. setter functions must have one parameter. PASS class X { constructor() {} get foo() {} } PASS class X { constructor() {} get foo(x) {} }:::SyntaxError: Unexpected identifier 'x'. getter functions must have no parameters. PASS class X { constructor() {} get foo({x, y}) {} }:::SyntaxError: Unexpected token '{'. getter functions must have no parameters. PASS successfullyParsed:::true TEST COMPLETE