Unified Intl.NumberFormat: Add some initial tests for SetNumberFormatUnitOptions.

test/intl402/NumberFormat/currencyDisplay-unit.js

+// Copyright 2018 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-setnumberformatunitoptions
+description: Checks handling of valid values for the numeric option to the RelativeTimeFormat constructor.
+info: |
+    SetNumberFormatUnitOptions ( intlObj, options )
+
+    6. Let currencyDisplay be ? GetOption(options, "currencyDisplay", "string", « "code", "symbol", "narrowSymbol", "name" », "symbol").
+    11. If style is "currency", then
+        f. Set intlObj.[[CurrencyDisplay]] to currencyDisplay.
+
+features: [Intl.NumberFormat-unified]
+---*/
+
+const validOptions = [
+  [undefined, "symbol"],
+  ["narrowSymbol", "narrowSymbol"],
+  [{ toString() { return "narrowSymbol"; } }, "narrowSymbol"],
+];
+
+for (const [validOption, expected] of validOptions) {
+  const nf = new Intl.NumberFormat([], {
+    "style": "currency",
+    "currency": "EUR",
+    "currencyDisplay": validOption,
+  });
+  const resolvedOptions = nf.resolvedOptions();
+  assert.sameValue(resolvedOptions.currencyDisplay, expected);
+}
+
+for (const [validOption] of validOptions) {
+  const nf = new Intl.NumberFormat([], {
+    "style": "percent",
+    "currencyDisplay": validOption,
+  });
+  const resolvedOptions = nf.resolvedOptions();
+  assert.sameValue(resolvedOptions.currencyDisplay, undefined);
+}

test/intl402/NumberFormat/style-unit.js

+// Copyright 2018 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-setnumberformatunitoptions
+description: Checks handling of valid values for the numeric option to the RelativeTimeFormat constructor.
+info: |
+    SetNumberFormatUnitOptions ( intlObj, options )
+
+    3. Let style be ? GetOption(options, "style", "string", « "decimal", "percent", "currency", "unit" », "decimal").
+    4. Set intlObj.[[Style]] to style.
+
+features: [Intl.NumberFormat-unified]
+---*/
+
+const validOptions = [
+  [undefined, "decimal"],
+  ["unit", "unit"],
+  [{ toString() { return "unit"; } }, "unit"],
+];
+
+for (const [validOption, expected] of validOptions) {
+  const nf = new Intl.NumberFormat([], {"style": validOption});
+  const resolvedOptions = nf.resolvedOptions();
+  assert.sameValue(resolvedOptions.style, expected);
+}