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test.js
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/**
* @license Apache-2.0
*
* Copyright (c) 2018 The Stdlib Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
'use strict';
// MODULES //
var tape = require( 'tape' );
var noop = require( '@stdlib/utils/noop' );
var ifelseAsync = require( './../lib' );
// TESTS //
tape( 'main export is a function', function test( t ) {
t.ok( true, __filename );
t.strictEqual( typeof ifelseAsync, 'function', 'main export is a function' );
t.end();
});
tape( 'the function throws an error if provided a first argument which is not a function', function test( t ) {
var values;
var i;
values = [
'5',
5,
NaN,
true,
false,
null,
void 0,
[],
{}
];
for ( i = 0; i < values.length; i++ ) {
t.throws( badValue( values[i] ), TypeError, 'throws an error when provided '+values[i] );
}
t.end();
function badValue( value ) {
return function badValue() {
ifelseAsync( value, 1.0, -1.0, noop );
};
}
});
tape( 'the function throws an error if provided a last argument which is not a function', function test( t ) {
var values;
var i;
values = [
'5',
5,
NaN,
true,
false,
null,
void 0,
[],
{}
];
for ( i = 0; i < values.length; i++ ) {
t.throws( badValue( values[i] ), TypeError, 'throws an error when provided '+values[i] );
}
t.end();
function badValue( value ) {
return function badValue() {
ifelseAsync( noop, 1.0, -1.0, value );
};
}
});
tape( 'if a predicate function returns a truthy value, the function returns the second argument', function test( t ) {
ifelseAsync( predicate, 'beep', 'boop', done );
function predicate( clbk ) {
setTimeout( onTimeout, 0 );
function onTimeout() {
clbk( null, true );
}
}
function done( error, result ) {
if ( error ) {
t.fail( error.message );
} else {
t.strictEqual( result, 'beep', 'returns expected value' );
}
t.end();
}
});
tape( 'if a predicate function returns a falsy value, the function returns the third argument', function test( t ) {
ifelseAsync( predicate, 'beep', 'boop', done );
function predicate( clbk ) {
setTimeout( onTimeout, 0 );
function onTimeout() {
clbk( null, false );
}
}
function done( error, result ) {
if ( error ) {
t.fail( error.message );
} else {
t.strictEqual( result, 'boop', 'returns expected value' );
}
t.end();
}
});
tape( 'if a predicate function returns an error, the function returns the error', function test( t ) {
ifelseAsync( predicate, 'beep', 'boop', done );
function predicate( clbk ) {
setTimeout( onTimeout, 0 );
function onTimeout() {
clbk( new Error( 'beep' ) );
}
}
function done( error ) {
if ( error ) {
t.pass( error.message );
} else {
t.fail( 'should return an error' );
}
t.end();
}
});
tape( 'the function does not guarantee asynchronous execution', function test( t ) {
var i = 0;
ifelseAsync( predicate, 'beep', 'boop', done );
i = 1;
function predicate( clbk ) {
clbk( null, true );
}
function done( error, result ) {
if ( error ) {
t.fail( error.message );
} else {
t.strictEqual( result, 'beep', 'returns expected value' );
}
t.strictEqual( i, 0, 'releases the zalgo' );
t.end();
}
});