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import assert from 'assert'; | ||
import lodashStable from 'lodash'; | ||
import { stubZero, falsey } from './utils.js'; | ||
import indexOf from '../indexOf.js'; | ||
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describe('indexOf', function() { | ||
var array = [1, 2, 3, 1, 2, 3]; | ||
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it('`_.indexOf` should return the index of the first matched value', function() { | ||
assert.strictEqual(indexOf(array, 3), 2); | ||
}); | ||
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it('`_.indexOf` should work with a positive `fromIndex`', function() { | ||
assert.strictEqual(indexOf(array, 1, 2), 3); | ||
}); | ||
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it('`_.indexOf` should work with a `fromIndex` >= `length`', function() { | ||
var values = [6, 8, Math.pow(2, 32), Infinity], | ||
expected = lodashStable.map(values, lodashStable.constant([-1, -1, -1])); | ||
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var actual = lodashStable.map(values, function(fromIndex) { | ||
return [ | ||
indexOf(array, undefined, fromIndex), | ||
indexOf(array, 1, fromIndex), | ||
indexOf(array, '', fromIndex) | ||
]; | ||
}); | ||
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assert.deepStrictEqual(actual, expected); | ||
}); | ||
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it('`_.indexOf` should work with a negative `fromIndex`', function() { | ||
assert.strictEqual(indexOf(array, 2, -3), 4); | ||
}); | ||
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it('`_.indexOf` should work with a negative `fromIndex` <= `-length`', function() { | ||
var values = [-6, -8, -Infinity], | ||
expected = lodashStable.map(values, stubZero); | ||
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var actual = lodashStable.map(values, function(fromIndex) { | ||
return indexOf(array, 1, fromIndex); | ||
}); | ||
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assert.deepStrictEqual(actual, expected); | ||
}); | ||
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it('`_.indexOf` should treat falsey `fromIndex` values as `0`', function() { | ||
var expected = lodashStable.map(falsey, stubZero); | ||
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var actual = lodashStable.map(falsey, function(fromIndex) { | ||
return indexOf(array, 1, fromIndex); | ||
}); | ||
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assert.deepStrictEqual(actual, expected); | ||
}); | ||
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it('`_.indexOf` should coerce `fromIndex` to an integer', function() { | ||
assert.strictEqual(indexOf(array, 2, 1.2), 1); | ||
}); | ||
}); |