TypeError: gen is not a function

[stevenvachon]

const {gen} = require('testcheck');
gen({a:0});

TypeError: gen is not a function

http://leebyron.com/testcheck-js/api#gen

[camsjams]

This is weird, I agree, I think the documentation that claims gen() is a function is incorrect.

Another section of the documentation correctly describes what gen is:

gen: A collection of ValueGenerators and functions that return ValueGenerators.

Seems like the RC which implements gen() is not published on npm, see also #92

[camsjams]

@stevenvachon also you don't really need the gen function. You can use gen.array and gen.object to accomplish similar functionality.

Take this example:

// desired shape
const someDog = {
	name: 'Fido',
	age: 12
};

// create property generator
const genDogs = gen.object({
	name: gen.string,
	age: gen.int
});

// sample results of property generator
console.log('a sample of dogs:', sample(genDogs));

The console prints something like:

a sample of dogs: [ { name: '', age: 0 },
          { name: 'á', age: 1 },
          { name: 'Ñ÷', age: 1 },
          { name: '÷W', age: 3 },
          { name: '', age: -4 },
          { name: 'UÜ\u0001y¿', age: -2 },
          { name: '�\u001cÑE', age: -4 },
          { name: '�', age: -3 },
          { name: 'â', age: -3 },
          { name: '1\n�]\u0007¾Ñîº', age: -3 } ]

It is also friendly with TypeScript:

interface Dog {
	name: string;
	age: number;
}

// desired shape
const dog: Dog = {
	name: 'Fido',
	age: 12
};

// create property generator
const genDogs = gen.object({
	name: gen.string,
	age: gen.int
}) as Generator<Dog>;

// sample results of property generator
console.log('a sample of dogs:', sample(genDogs));