Merge pull request swiftlang#27793 from phausler/back_port_foundation_tests

Back port foundation tests

Author: Nathan Hawes

test/stdlib/TestData.swift

@@ -3806,30 +3806,34 @@ class TestData : TestDataSuper {
     }
 
     func test_nsdataSequence() {
-        let bytes: [UInt8] = Array(0x00...0xFF)
-        let data = bytes.withUnsafeBytes { NSData(bytes: $0.baseAddress, length: $0.count) }
+        if #available(macOS 10.15, iOS 13, tvOS 13, watchOS 6, *) {
+            let bytes: [UInt8] = Array(0x00...0xFF)
+            let data = bytes.withUnsafeBytes { NSData(bytes: $0.baseAddress, length: $0.count) }
 
-        for byte in bytes {
-            expectEqual(data[Int(byte)], byte)
+            for byte in bytes {
+                expectEqual(data[Int(byte)], byte)
+            }
         }
     }
 
     func test_dispatchSequence() {
-        let bytes1: [UInt8] = Array(0x00..<0xF0)
-        let bytes2: [UInt8] = Array(0xF0..<0xFF)
-        var data = DispatchData.empty
-        bytes1.withUnsafeBytes {
-            data.append($0)
-        }
-        bytes2.withUnsafeBytes {
-            data.append($0)
-        }
+        if #available(macOS 10.15, iOS 13, tvOS 13, watchOS 6, *) {
+            let bytes1: [UInt8] = Array(0x00..<0xF0)
+            let bytes2: [UInt8] = Array(0xF0..<0xFF)
+            var data = DispatchData.empty
+            bytes1.withUnsafeBytes {
+                data.append($0)
+            }
+            bytes2.withUnsafeBytes {
+                data.append($0)
+            }
 
-        for byte in bytes1 {
-            expectEqual(data[Int(byte)], byte)
-        }
-        for byte in bytes2 {
-            expectEqual(data[Int(byte)], byte)
+            for byte in bytes1 {
+                expectEqual(data[Int(byte)], byte)
+            }
+            for byte in bytes2 {
+                expectEqual(data[Int(byte)], byte)
+            }
         }
     }
 }
@@ -4151,9 +4155,10 @@ DataTests.test("test_validateMutation_slice_customBacking_withUnsafeMutableBytes
 DataTests.test("test_validateMutation_slice_customMutableBacking_withUnsafeMutableBytes_lengthLessThanLowerBound") { TestData().test_validateMutation_slice_customMutableBacking_withUnsafeMutableBytes_lengthLessThanLowerBound() }
 DataTests.test("test_byte_access_of_discontiguousData") { TestData().test_byte_access_of_discontiguousData() }
 DataTests.test("test_rangeOfSlice") { TestData().test_rangeOfSlice() }
-DataTests.test("test_nsdataSequence") { TestData().test_nsdataSequence() }
-DataTests.test("test_dispatchSequence") { TestData().test_dispatchSequence() }
-
+if #available(macOS 10.15, iOS 13, tvOS 13, watchOS 6, *) {
+    DataTests.test("test_nsdataSequence") { TestData().test_nsdataSequence() }
+    DataTests.test("test_dispatchSequence") { TestData().test_dispatchSequence() }
+}
 
 // XCTest does not have a crash detection, whereas lit does
 DataTests.test("bounding failure subdata") {

test/stdlib/TestDecimal.swift

@@ -120,9 +120,11 @@ class TestDecimal : TestDecimalSuper {
         expectFalse(zero.isNaN)
         expectFalse(zero.isSignaling)
 
-        let d1 = Decimal(1234567890123456789 as UInt64)
-        expectEqual(d1._exponent, 0)
-        expectEqual(d1._length, 4)
+        if #available(macOS 10.15, iOS 13, tvOS 13, watchOS 6, *) {
+            let d1 = Decimal(1234567890123456789 as UInt64)
+            expectEqual(d1._exponent, 0)
+            expectEqual(d1._length, 4)
+        }
     }
     func test_Constants() {
         expectEqual(8, NSDecimalMaxSize)
@@ -303,7 +305,9 @@ class TestDecimal : TestDecimalSuper {
         expectEqual(Decimal(68040), Decimal(386).advanced(by: Decimal(67654)))
         expectEqual(Decimal(1.234), abs(Decimal(1.234)))
         expectEqual(Decimal(1.234), abs(Decimal(-1.234)))
-        expectTrue(Decimal.nan.magnitude.isNaN)
+        if #available(macOS 10.15, iOS 13, tvOS 13, watchOS 6, *) {
+            expectTrue(Decimal.nan.magnitude.isNaN)
+        }
         var a = Decimal(1234)
         var r = a
         expectEqual(.noError, NSDecimalMultiplyByPowerOf10(&r, &a, 1, .plain))
@@ -335,7 +339,9 @@ class TestDecimal : TestDecimalSuper {
                 expectEqual(.noError, NSDecimalPower(&result, &actual, j, .plain))
                 let expected = Decimal(pow(Double(i), Double(j)))
                 expectEqual(expected, result, "\(result) == \(i)^\(j)")
-                expectEqual(expected, pow(actual, j))
+                if #available(macOS 10.15, iOS 13, tvOS 13, watchOS 6, *) {
+                    expectEqual(expected, pow(actual, j))
+                }
             }
         }
     }