Add basic tests converted from demitasse

test/built-ins/Temporal/PlainYearMonth/prototype/since/arguments-casting.js

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+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plainyearmonth.prototype.since
+description: Calls to PYM.since cast arguments.
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const nov94 = new Temporal.PlainYearMonth(1994, 11);
+const jun13 = new Temporal.PlainYearMonth(2013, 6);
+const diff = jun13.since(nov94);
+
+TemporalHelpers.assertDurationsEqual(jun13.since({ year: 1994, month: 11 }), diff, 'Casts object argument');
+TemporalHelpers.assertDurationsEqual(jun13.since('1994-11'), diff, 'Casts string argument');

test/built-ins/Temporal/PlainYearMonth/prototype/since/arguments-missing-throws.js

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+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plainyearmonth.prototype.since
+description: Calls to PYM.since throw when missing required arguments.
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const jun13 = new Temporal.PlainYearMonth(2013, 6);
+
+assert.throws(TypeError, () => jun13.since({ year: 1994 }), 'Throws when missing required month');
+assert.throws(TypeError, () => jun13.since({ month: 11 }), 'Throws when missing required year');

test/built-ins/Temporal/PlainYearMonth/prototype/since/basic.js

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+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plainyearmonth.prototype.since
+description: Basic calls to PYM.since.
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const feb20 = new Temporal.PlainYearMonth(2020, 2);
+const feb21 = new Temporal.PlainYearMonth(2021, 2);
+const oneYear = Temporal.Duration.from('P1Y');
+const twelveMonths = Temporal.Duration.from('P12M');
+
+TemporalHelpers.assertDurationsEqual(feb21.since(feb20), oneYear, 'Returns year by default');
+TemporalHelpers.assertDurationsEqual(feb21.since(feb20,  { largestUnit: 'auto' }), oneYear, 'Returns year by default');
+
+TemporalHelpers.assertDurationsEqual(feb21.since(feb20, { largestUnit: 'years' }), oneYear, 'Returns year explicitly');
+TemporalHelpers.assertDurationsEqual(feb21.since(feb20, { largestUnit: 'months' }), twelveMonths, 'Returns months when requested.')

test/built-ins/Temporal/PlainYearMonth/prototype/since/negation.js

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+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plainyearmonth.prototype.since
+description: Since returns negative and positive values
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const nov94 = new Temporal.PlainYearMonth(1994, 11);
+const jun13 = new Temporal.PlainYearMonth(2013, 6);
+const diff = jun13.since(nov94);
+
+TemporalHelpers.assertDurationsEqual(nov94.since(jun13), diff.negated(), 'Since is inverse of until');

test/built-ins/Temporal/PlainYearMonth/prototype/since/roundingincrement-as-expected.js

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+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plainyearmonth.prototype.since
+description: Since rounding increments work as expected
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const earlier = new Temporal.PlainYearMonth(2019, 1);
+const later = new Temporal.PlainYearMonth(2021, 9);
+
+const laterSinceYear = later.since(earlier, { smallestUnit: 'years', roundingIncrement: 4, roundingMode: 'halfExpand' });
+TemporalHelpers.assertDurationsEqual(laterSinceYear, Temporal.Duration.from('P4Y'), 'rounds to an increment of years');
+
+const laterSinceMixed = later.since(earlier, { smallestUnit: 'months', roundingIncrement: 5 });
+TemporalHelpers.assertDurationsEqual(laterSinceMixed, Temporal.Duration.from('P2Y5M'), 'rounds to an increment of months mixed with years');
+
+const laterSinceMonth = later.since(earlier, { largestUnit: 'months', smallestUnit: 'months', roundingIncrement: 10 });
+TemporalHelpers.assertDurationsEqual(laterSinceMonth, Temporal.Duration.from('P30M'), 'rounds to an increment of pure months');

test/built-ins/Temporal/PlainYearMonth/prototype/since/symmetry.js

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+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plainyearmonth.prototype.since
+description: Since observes symmetry with until
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const nov94 = new Temporal.PlainYearMonth(1994, 11);
+const jun13 = new Temporal.PlainYearMonth(2013, 6);
+const diff = jun13.since(nov94);
+
+TemporalHelpers.assertDurationsEqual(diff, nov94.until(jun13), 'Since is inverse of until');