[英]JavaScript, mocha test for random numbers
I use the following code which return array of random numbers my question is how should I unit test it with mocha and chai since the issue here that is provide in every run random numbers... 我使用下面的代码返回随机数组我的问题是我应该如何用mocha和chai进行单元测试,因为这里的问题是每次运行随机数提供的...
var randomArray = function(start, end) {
var range = [];
var resetRange = function() {
for (let i = start; i < end; i++) {
range.push(i);
}
shuffle(range);
};
return function(n) {
if (range.length === 0) {
resetRange();
}
return range.splice(0, n);
};
};
var arr = randomArray(10,20);
arr(10)
will provide for example arr(10)
将提供
[15, 16, 14, 17, 11, 19, 18, 10, 12, 13]
arr(3)
will provide for example arr(3)
将提供
[18, 15, 10]
assert.notDeepEqual
). assert.notDeepEqual
)。 start
and less than end
. start
而不是end
。 start
and end
values. start
和end
的值。 start
and end
, eg for start > end
, start === end
, start < 0
, .... start
和end
,例如start > end
, start === end
, start < 0
,.... It depends on level of confidence you want to achieve and time you can spent on that testing. 这取决于您想要达到的信心水平以及您可以花在测试上的时间。
Examples of some points I mentioned (in ES5 syntax as question is using it): 我提到的一些要点的例子(在ES5语法中,问题就是使用它):
var assert = require('chai').assert;
var testLength = function(length) {
// WHEN
var actualLength = randomArray(10, 20)(length).length;
// THEN
assert.equal(actualLength, length);
};
var testElementsRange = function(start, end) {
// WHEN
var actualArray = randomArray(10, 20)(10);
// THEN
for (var index = 0; index < actualArray.length; ++index) {
assert.isAtLeast(actualArray[index], start);
assert.isAtMost(actualArray[index], end);
}
}
describe('randomArray', function() {
describe('generates array', function() {
it('with length 3', function() {
testLength(3);
});
it('with length 10', function() {
testLength(10);
});
it('with random elements', function () {
// WHEN
var array1 = randomArray(10, 20)(10);
var array2 = randomArray(10, 20)(10);
// THEN
assert.notDeepEqual(array1, array2);
});
it('with elements within 10-20 range', function () {
testElementsRange(10, 20);
});
});
});
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