Tests for ES6 class name semantics in class statements and expressions

On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".


Class statement
PASS A threw exception ReferenceError: A is not defined.
PASS 'use strict'; A threw exception ReferenceError: A is not defined.
PASS class {} threw exception SyntaxError: Unexpected token {.
PASS 'use strict'; class {} threw exception SyntaxError: Unexpected token {.
PASS class { constructor() {} } threw exception SyntaxError: Unexpected token {.
PASS 'use strict'; class { constructor() {} } threw exception SyntaxError: Unexpected token {.
PASS class A { constructor() {} } did not throw exception.
PASS 'use strict'; class A { constructor() {} } did not throw exception.
PASS class A { constructor() {} }; A.toString() is 'class A { constructor() {} }'
PASS 'use strict'; class A { constructor() {} }; A.toString() is 'class A { constructor() {} }'
PASS class A { constructor() {} }; (new A) instanceof A is true
PASS 'use strict'; class A { constructor() {} }; (new A) instanceof A is true
PASS class A { constructor() { this.base = A; } }; (new A).base.toString() is 'class A { constructor() { this.base = A; } }'
PASS 'use strict'; class A { constructor() { this.base = A; } }; (new A).base.toString() is 'class A { constructor() { this.base = A; } }'
PASS class A { constructor() {} }; class B extends A {}; did not throw exception.
PASS 'use strict'; class A { constructor() {} }; class B extends A {}; did not throw exception.
PASS class A { constructor() {} }; class B extends A { constructor() {} }; B.toString() is 'class B extends A { constructor() {} }'
PASS 'use strict'; class A { constructor() {} }; class B extends A { constructor() {} }; B.toString() is 'class B extends A { constructor() {} }'
PASS class A { constructor() {} }; class B extends A {}; (new B) instanceof A is true
PASS 'use strict'; class A { constructor() {} }; class B extends A {}; (new B) instanceof A is true
PASS class A { constructor() {} }; class B extends A {}; (new B) instanceof B is true
PASS 'use strict'; class A { constructor() {} }; class B extends A {}; (new B) instanceof B is true
PASS class A { constructor() {} }; class B extends A { constructor() { super(); this.base = A; this.derived = B; } }; (new B).base.toString() is 'class A { constructor() {} }'
PASS 'use strict'; class A { constructor() {} }; class B extends A { constructor() { super(); this.base = A; this.derived = B; } }; (new B).base.toString() is 'class A { constructor() {} }'
PASS class A { constructor() {} }; class B extends A { constructor() { super(); this.base = A; this.derived = B; } }; (new B).derived.toString() is 'class B extends A { constructor() { super(); this.base = A; this.derived = B; } }'
PASS 'use strict'; class A { constructor() {} }; class B extends A { constructor() { super(); this.base = A; this.derived = B; } }; (new B).derived.toString() is 'class B extends A { constructor() { super(); this.base = A; this.derived = B; } }'

Class expression
PASS A threw exception ReferenceError: A is not defined.
PASS 'use strict'; A threw exception ReferenceError: A is not defined.
PASS (class {}) did not throw exception.
PASS 'use strict'; (class {}) did not throw exception.
PASS (class { constructor(){} }) did not throw exception.
PASS 'use strict'; (class { constructor(){} }) did not throw exception.
PASS typeof (class {}) is "function"
PASS 'use strict'; typeof (class {}) is "function"
PASS (class A {}) did not throw exception.
PASS 'use strict'; (class A {}) did not throw exception.
PASS typeof (class A {}) is "function"
PASS 'use strict'; typeof (class A {}) is "function"
PASS (class A {}); A threw exception ReferenceError: A is not defined.
PASS 'use strict'; (class A {}); A threw exception ReferenceError: A is not defined.
PASS new (class A {}) did not throw exception.
PASS 'use strict'; new (class A {}) did not throw exception.
PASS typeof (new (class A {})) is "object"
PASS 'use strict'; typeof (new (class A {})) is "object"
PASS (new (class A { constructor() { this.base = A; } })).base did not throw exception.
PASS 'use strict'; (new (class A { constructor() { this.base = A; } })).base did not throw exception.
PASS (new (class A { constructor() { this.base = A; } })).base.toString() is "class A { constructor() { this.base = A; } }"
PASS 'use strict'; (new (class A { constructor() { this.base = A; } })).base.toString() is "class A { constructor() { this.base = A; } }"
PASS class A {}; (class B extends A {}) did not throw exception.
PASS 'use strict'; class A {}; (class B extends A {}) did not throw exception.
PASS class A {}; (class B extends A {}); B threw exception ReferenceError: B is not defined.
PASS 'use strict'; class A {}; (class B extends A {}); B threw exception ReferenceError: B is not defined.
PASS class A {}; new (class B extends A {}) did not throw exception.
PASS 'use strict'; class A {}; new (class B extends A {}) did not throw exception.
PASS class A {}; new (class B extends A { constructor() { super(); this.base = A; this.derived = B; } }) did not throw exception.
PASS 'use strict'; class A {}; new (class B extends A { constructor() { super(); this.base = A; this.derived = B; } }) did not throw exception.
PASS class A {}; (new (class B extends A { constructor() { super(); this.base = A; this.derived = B; } })) instanceof A is true
PASS 'use strict'; class A {}; (new (class B extends A { constructor() { super(); this.base = A; this.derived = B; } })) instanceof A is true
PASS class A { constructor() {} }; (new (class B extends A { constructor() { super(); this.base = A; this.derived = B; } })).base.toString() is 'class A { constructor() {} }'
PASS 'use strict'; class A { constructor() {} }; (new (class B extends A { constructor() { super(); this.base = A; this.derived = B; } })).base.toString() is 'class A { constructor() {} }'
PASS class A { constructor() {} }; (new (class B extends A { constructor() { super(); this.base = A; this.derived = B; } })).derived.toString() is 'class B extends A { constructor() { super(); this.base = A; this.derived = B; } }'
PASS 'use strict'; class A { constructor() {} }; (new (class B extends A { constructor() { super(); this.base = A; this.derived = B; } })).derived.toString() is 'class B extends A { constructor() { super(); this.base = A; this.derived = B; } }'

Class expression assignment to variable
PASS A threw exception ReferenceError: A is not defined.
PASS 'use strict'; A threw exception ReferenceError: A is not defined.
PASS var VarA = class {} did not throw exception.
PASS 'use strict'; var VarA = class {} did not throw exception.
PASS var VarA = class { constructor() {} }; VarA.toString() is 'class { constructor() {} }'
PASS 'use strict'; var VarA = class { constructor() {} }; VarA.toString() is 'class { constructor() {} }'
PASS VarA threw exception ReferenceError: VarA is not defined.
PASS 'use strict'; VarA threw exception ReferenceError: VarA is not defined.
PASS var VarA = class A { constructor() {} } did not throw exception.
PASS 'use strict'; var VarA = class A { constructor() {} } did not throw exception.
PASS var VarA = class A { constructor() {} }; VarA.toString() is 'class A { constructor() {} }'
PASS 'use strict'; var VarA = class A { constructor() {} }; VarA.toString() is 'class A { constructor() {} }'
PASS var VarA = class A { constructor() {} }; A.toString() threw exception ReferenceError: A is not defined.
PASS 'use strict'; var VarA = class A { constructor() {} }; A.toString() threw exception ReferenceError: A is not defined.
PASS var VarA = class A { constructor() {} }; (new VarA) instanceof VarA is true
PASS 'use strict'; var VarA = class A { constructor() {} }; (new VarA) instanceof VarA is true
PASS var VarA = class A { constructor() { this.base = A; } }; (new VarA).base.toString() is 'class A { constructor() { this.base = A; } }'
PASS 'use strict'; var VarA = class A { constructor() { this.base = A; } }; (new VarA).base.toString() is 'class A { constructor() { this.base = A; } }'
PASS var VarA = class A { constructor() {} }; var VarB = class B extends VarA { constructor() {} }; did not throw exception.
PASS 'use strict'; var VarA = class A { constructor() {} }; var VarB = class B extends VarA { constructor() {} }; did not throw exception.
PASS var VarA = class A { constructor() {} }; var VarB = class B extends VarA { constructor() {} }; B threw exception ReferenceError: B is not defined.
PASS 'use strict'; var VarA = class A { constructor() {} }; var VarB = class B extends VarA { constructor() {} }; B threw exception ReferenceError: B is not defined.
PASS var VarA = class A { constructor() {} }; var VarB = class B extends VarA { constructor() {} }; VarB.toString() is 'class B extends VarA { constructor() {} }'
PASS 'use strict'; var VarA = class A { constructor() {} }; var VarB = class B extends VarA { constructor() {} }; VarB.toString() is 'class B extends VarA { constructor() {} }'
PASS var VarA = class A { constructor() {} }; var VarB = class B extends VarA { }; (new VarB) instanceof VarA is true
PASS 'use strict'; var VarA = class A { constructor() {} }; var VarB = class B extends VarA { }; (new VarB) instanceof VarA is true
PASS var VarA = class A { constructor() {} }; var VarB = class B extends VarA { }; (new VarB) instanceof VarB is true
PASS 'use strict'; var VarA = class A { constructor() {} }; var VarB = class B extends VarA { }; (new VarB) instanceof VarB is true
PASS var VarA = class A { constructor() {} }; var VarB = class B extends VarA { constructor() { super(); this.base = VarA; this.derived = B; this.derivedVar = VarB; } }; (new VarB).base === VarA is true
PASS 'use strict'; var VarA = class A { constructor() {} }; var VarB = class B extends VarA { constructor() { super(); this.base = VarA; this.derived = B; this.derivedVar = VarB; } }; (new VarB).base === VarA is true
PASS var VarA = class A { constructor() {} }; var VarB = class B extends VarA { constructor() { super(); this.base = VarA; this.derived = B; this.derivedVar = VarB; } }; (new VarB).derived === VarB is true
PASS 'use strict'; var VarA = class A { constructor() {} }; var VarB = class B extends VarA { constructor() { super(); this.base = VarA; this.derived = B; this.derivedVar = VarB; } }; (new VarB).derived === VarB is true
PASS var VarA = class A { constructor() {} }; var VarB = class B extends VarA { constructor() { super(); this.base = VarA; this.derived = B; this.derivedVar = VarB; } }; (new VarB).derivedVar === VarB is true
PASS 'use strict'; var VarA = class A { constructor() {} }; var VarB = class B extends VarA { constructor() { super(); this.base = VarA; this.derived = B; this.derivedVar = VarB; } }; (new VarB).derivedVar === VarB is true

Class statement binding in other circumstances
PASS var result = A; result threw exception ReferenceError: A is not defined.
PASS 'use strict'; var result = A; result threw exception ReferenceError: A is not defined.
PASS var result = A; class A {}; result threw exception ReferenceError: Cannot access 'A' before initialization.
PASS 'use strict'; var result = A; class A {}; result threw exception ReferenceError: Cannot access 'A' before initialization.
PASS class A { constructor() { A = 1; } }; new A threw exception TypeError: Assignment to constant variable..
PASS 'use strict'; class A { constructor() { A = 1; } }; new A threw exception TypeError: Assignment to constant variable..
PASS class A { constructor() { } }; A = 1; A is 1
PASS 'use strict'; class A { constructor() { } }; A = 1; A is 1
PASS class A {}; var result = A; result did not throw exception.
PASS 'use strict'; class A {}; var result = A; result did not throw exception.
PASS eval('var Foo = 10'); Foo is 10
PASS 'use strict'; eval('var Foo = 10'); Foo threw exception ReferenceError: Foo is not defined.
PASS eval('class Bar { constructor() {} }; Bar.toString()') is 'class Bar { constructor() {} }'
PASS 'use strict'; eval('class Bar { constructor() {} }'); Bar.toString() threw exception ReferenceError: Bar is not defined.
PASS successfullyParsed is true

TEST COMPLETE