Add test for Temporal.Duration.p*.abs

(Philip, March 2022: This was originally Frank's PR tc39#3062. I did some
reformatting and removed duplicate tests)

test/built-ins/Temporal/Duration/prototype/abs/basic.js

@@ -0,0 +1,39 @@
+// Copyright (C) 2021 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.duration.prototype.abs
+description: Temporal.Duration.prototype.abs will return absolute value of the input duration.
+info: |
+  1. Let duration be the this value.
+  2. Perform ? RequireInternalSlot(duration, [[InitializedTemporalDuration]]).
+  3. Return ? CreateTemporalDuration(abs(duration.[[Years]]), abs(duration.[[Months]]), abs(duration.[[Weeks]]), abs(duration.[[Days]]), abs(duration.[[Hours]]), abs(duration.[[Minutes]]), abs(duration.[[Seconds]]), abs(duration.[[Milliseconds]]), abs(duration.[[Microseconds]]), abs(duration.[[Nanoseconds]])).
+
+features: [Temporal]
+includes: [temporalHelpers.js]
+---*/
+
+let d1 = new Temporal.Duration();
+TemporalHelpers.assertDuration(
+    d1.abs(), 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, "empty");
+
+let d2 = new Temporal.Duration(1, 2, 3, 4, 5, 6, 7, 8, 9, 10);
+TemporalHelpers.assertDuration(
+    d2.abs(), 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, "positive");
+
+let d3 = new Temporal.Duration(1e5, 2e5, 3e5, 4e5, 5e5, 6e5, 7e5, 8e5, 9e5, 10e5);
+TemporalHelpers.assertDuration(
+    d3.abs(), 1e5, 2e5, 3e5, 4e5, 5e5, 6e5, 7e5, 8e5, 9e5, 10e5, "large positive");
+
+let d4 = new Temporal.Duration(-1, -2, -3, -4, -5, -6, -7, -8, -9, -10);
+TemporalHelpers.assertDuration(
+    d4.abs(), 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, "negative");
+
+// Test with some zeros
+let d5 = new Temporal.Duration(1, 0, 3, 0, 5, 0, 7, 0, 9, 0);
+TemporalHelpers.assertDuration(
+    d5.abs(), 1, 0, 3, 0, 5, 0, 7, 0, 9, 0, "some zeros");
+
+let d6 = new Temporal.Duration(0, 2, 0, 4, 0, 6, 0, 8, 0, 10);
+TemporalHelpers.assertDuration(
+    d6.abs(), 0, 2, 0, 4, 0, 6, 0, 8, 0, 10, "other zeros");