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Diffstat (limited to 'date-fns/src/subQuarters/test.ts')
-rw-r--r-- | date-fns/src/subQuarters/test.ts | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/date-fns/src/subQuarters/test.ts b/date-fns/src/subQuarters/test.ts new file mode 100644 index 0000000..cfd1d9f --- /dev/null +++ b/date-fns/src/subQuarters/test.ts @@ -0,0 +1,69 @@ +// @flow +/* eslint-env mocha */ + +import assert from 'power-assert' +import subQuarters from '.' + +describe('subQuarters', function() { + it('subtracts the given number of quarters', function() { + const result = subQuarters(new Date(2014, 8 /* Sep */, 1), 3) + assert.deepEqual(result, new Date(2013, 11 /* Dec */, 1)) + }) + + it('accepts a timestamp', function() { + const result = subQuarters(new Date(2014, 8 /* Sep */, 1).getTime(), 4) + assert.deepEqual(result, new Date(2013, 8 /* Sep */, 1)) + }) + + it('converts a fractional number to an integer', function() { + const result = subQuarters(new Date(2014, 8 /* Sep */, 1), 3.33) + assert.deepEqual(result, new Date(2013, 11 /* Dec */, 1)) + }) + + it('implicitly converts number arguments', function() { + // $ExpectedMistake + // @ts-expect-error + const result = subQuarters(new Date(2014, 8 /* Sep */, 1), '3') + assert.deepEqual(result, new Date(2013, 11 /* Dec */, 1)) + }) + + it('does not mutate the original date', function() { + const date = new Date(2014, 8 /* Sep */, 1) + subQuarters(date, 3) + assert.deepEqual(date, new Date(2014, 8 /* Sep */, 1)) + }) + + it('works well if the desired month has fewer days and the provided date is in the last day of a month', function() { + const date = new Date(2014, 11 /* Dec */, 31) + const result = subQuarters(date, 1) + assert.deepEqual(result, new Date(2014, 8 /* Sep */, 30)) + }) + + it('handles dates before 100 AD', function() { + const initialDate = new Date(0) + initialDate.setFullYear(0, 10 /* Nov */, 30) + initialDate.setHours(0, 0, 0, 0) + const expectedResult = new Date(0) + expectedResult.setFullYear(0, 1 /* Feb */, 29) + expectedResult.setHours(0, 0, 0, 0) + const result = subQuarters(initialDate, 3) + assert.deepEqual(result, expectedResult) + }) + + it('returns `Invalid Date` if the given date is invalid', function() { + const result = subQuarters(new Date(NaN), 3) + // @ts-expect-error + assert(result instanceof Date && isNaN(result)) + }) + + it('returns `Invalid Date` if the given amount is NaN', function() { + const result = subQuarters(new Date(2014, 8 /* Sep */, 1), NaN) + // @ts-expect-error + assert(result instanceof Date && isNaN(result)) + }) + + it('throws TypeError exception if passed less than 2 arguments', function() { + assert.throws(subQuarters.bind(null), TypeError) + assert.throws(subQuarters.bind(null, 1), TypeError) + }) +}) |