disable test_currencyPluralMinimumIntegerDigits

test_currencyPluralMinimumIntegerDigits does not and did never work on
Ubuntu 14.04. In Swift 5 it works because a newer ICU is vendored which
fixes the issue. But in Swift 4.2.x we don't vendor ICU so we can't get
this test to work on Ubuntu 14.04, hence removing as it's no worse than
Swift 4.2.3.

Author: weissi

TestFoundation/TestNumberFormatter.swift

@@ -30,7 +30,6 @@ class TestNumberFormatter: XCTestCase {
             ("test_scientificMinimumIntegerDigits", test_scientificMinimumIntegerDigits),
             ("test_spellOutMinimumIntegerDigits", test_spellOutMinimumIntegerDigits),
             ("test_ordinalMinimumIntegerDigits", test_ordinalMinimumIntegerDigits),
-            ("test_currencyPluralMinimumIntegerDigits", test_currencyPluralMinimumIntegerDigits),
             ("test_currencyISOCodeMinimumIntegerDigits", test_currencyISOCodeMinimumIntegerDigits),
             ("test_currencyAccountingMinimumIntegerDigits", test_currencyAccountingMinimumIntegerDigits),
             ("test_maximumIntegerDigits", test_maximumIntegerDigits),
@@ -346,29 +345,6 @@ class TestNumberFormatter: XCTestCase {
         XCTAssertEqual(formatter2.string(from: 42), "42nd")
     }
 
-    func test_currencyPluralMinimumIntegerDigits() {
-        // If .minimumIntegerDigits is set to 0 before .numberStyle change, preserve the value
-        let formatter = NumberFormatter()
-        XCTAssertEqual(formatter.minimumIntegerDigits, 0)
-        formatter.minimumIntegerDigits = 0
-        formatter.numberStyle = .currencyPlural
-        XCTAssertEqual(formatter.minimumIntegerDigits, 0)
-        formatter.locale = Locale(identifier: "en_US")
-        XCTAssertEqual(formatter.string(from: 0), "0.00 US dollars")
-        XCTAssertEqual(formatter.string(from: 1.23), "1.23 US dollars")
-        XCTAssertEqual(formatter.string(from: 123.4), "123.40 US dollars")
-
-        // If .minimumIntegerDigits is not set before .numberStyle change, update the value
-        let formatter2 = NumberFormatter()
-        XCTAssertEqual(formatter2.minimumIntegerDigits, 0)
-        formatter2.numberStyle = .currencyPlural
-        XCTAssertEqual(formatter2.minimumIntegerDigits, 0)
-        formatter2.locale = Locale(identifier: "en_US")
-        XCTAssertEqual(formatter2.string(from: 0.01), "0.01 US dollars")
-        XCTAssertEqual(formatter2.string(from: 1.234), "1.23 US dollars")
-        XCTAssertEqual(formatter2.string(from: 123456.7), "123,456.70 US dollars")
-    }
-
     func test_currencyISOCodeMinimumIntegerDigits() {
         // If .minimumIntegerDigits is set to 0 before .numberStyle change, preserve the value
         let formatter = NumberFormatter()