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createChainedFunctionSpec.js
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createChainedFunctionSpec.js
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/* eslint no-new-func: 0 */
import createChainedFunction from '../../src/utils/createChainedFunction';
describe('createChainedFunction', function() {
it('returns null with no arguments', function() {
expect(createChainedFunction()).to.equal(null);
});
it('returns original function when single function is provided', function() {
const func1 = sinon.stub();
createChainedFunction(func1).should.equal(func1);
});
it('wraps two functions with another that invokes both when called', function() {
const func1 = sinon.stub();
const func2 = sinon.stub();
const chained = createChainedFunction(func1, func2);
chained
.should.not.equal(func1)
.and.should.not.equal(func2);
func1.should.not.have.been.called;
func2.should.not.have.been.called;
chained();
func1.should.have.been.calledOnce;
func2.should.have.been.calledOnce;
});
it('wraps multiple functions and invokes them in the order provided', function() {
const results = [];
const func1 = () => results.push(1);
const func2 = () => results.push(2);
const func3 = () => results.push(3);
const chained = createChainedFunction(func1, func2, func3);
chained();
results.should.eql([1, 2, 3]);
});
it('forwards arguments to all chained functions', function() {
const in1 = 'herpa derpa';
const in2 = {
herpa: 'derpa'
};
const func = (arg1, arg2) => {
arg1.should.equal(in1);
arg2.should.equal(in2);
};
const chained = createChainedFunction(func, func, func);
chained(in1, in2);
});
it('throws when func is not provided', function() {
expect(() => {
createChainedFunction({ herpa: 'derpa' });
}).to.throw(/Invalid Argument Type/);
});
it('works with new Function call', function() {
const results = [];
const func1 = new Function('results', 'results.push(1);');
const func2 = new Function('results', 'results.push(2);');
const chained = createChainedFunction(func1, func2);
chained(results);
results.should.eql([1, 2]);
});
});