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import * as chai from 'chai';
import { chaiSetup } from '../utils/chai_setup';
import { testWithReferenceFuncAsync } from '../utils/test_with_reference';
chaiSetup.configure();
const expect = chai.expect;
async function divAsync(x: number, y: number): Promise<number> {
if (y === 0) {
throw new Error('MathError: divide by zero');
}
return x / y;
}
// returns an async function that always returns the given value.
function alwaysValueFunc(value: number): (x: number, y: number) => Promise<number> {
return async (x: number, y: number) => value;
}
// returns an async function which always throws/rejects with the given error
// message.
function alwaysFailFunc(errMessage: string): (x: number, y: number) => Promise<number> {
return async (x: number, y: number) => {
throw new Error(errMessage);
};
}
describe('testWithReferenceFuncAsync', () => {
it('passes when both succeed and actual === expected', async () => {
await testWithReferenceFuncAsync(alwaysValueFunc(0.5), divAsync, [1, 2]);
});
it('passes when both fail and actual error contains expected error', async () => {
await testWithReferenceFuncAsync(alwaysFailFunc('divide by zero'), divAsync, [1, 0]);
});
it('fails when both succeed and actual !== expected', async () => {
expect(testWithReferenceFuncAsync(alwaysValueFunc(3), divAsync, [1, 2])).to.be.rejectedWith(
'Test case {"x":1,"y":2}: expected { value: 0.5 } to deeply equal { value: 3 }',
);
});
it('fails when both fail and actual error does not contain expected error', async () => {
expect(
testWithReferenceFuncAsync(alwaysFailFunc('Unexpected math error'), divAsync, [1, 0]),
).to.be.rejectedWith(
'MathError: divide by zero\n\tTest case: {"x":1,"y":0}: expected \'MathError: divide by zero\' to include \'Unexpected math error\'',
);
});
it('fails when referenceFunc succeeds and testFunc fails', async () => {
expect(testWithReferenceFuncAsync(alwaysValueFunc(0), divAsync, [1, 0])).to.be.rejectedWith(
'Test case {"x":1,"y":0}: expected { error: \'MathError: divide by zero\' } to deeply equal { value: 0 }',
);
});
it('fails when referenceFunc fails and testFunc succeeds', async () => {
expect(testWithReferenceFuncAsync(alwaysFailFunc('divide by zero'), divAsync, [1, 2])).to.be.rejectedWith(
'Expected error containing divide by zero but got no error\n\tTest case: {"x":1,"y":2}',
);
});
});
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