[android] fix android test builds to ensure they work with new Android overlay module

Author: hyp

Tests/Foundation/FTPServer.swift

@@ -15,6 +15,8 @@ import Dispatch
     import Glibc
 #elseif canImport(Darwin)
     import Darwin
+#elseif canImport(Android)
+    import Android
 #endif
 
 public class ServerSemaphore {

Tests/Foundation/HTTPServer.swift

@@ -21,6 +21,8 @@ import Dispatch
     import Darwin
 #elseif canImport(Glibc)
     import Glibc
+#elseif canImport(Android)
+    import Android
 #endif
 
 #if !os(Windows)

Tests/Foundation/Tests/TestFileHandle.swift

@@ -111,7 +111,14 @@ class TestFileHandle : XCTestCase {
 #else
         var fds: [Int32] = [-1, -1]
         fds.withUnsafeMutableBufferPointer { (pointer) -> Void in
-            pipe(pointer.baseAddress)
+            let baseAddress = pointer.baseAddress
+#if canImport(Android)
+            // pipe takes in a non-nullable pointer in the Android NDK only.
+            guard let baseAddress else {
+                return
+            }
+#endif
+            pipe(baseAddress)
         }
 
         close(fds[1])

Tests/Foundation/Tests/TestNSData.swift

@@ -589,6 +589,8 @@ class TestNSData: LoopbackServerTest {
                 let permission = try fileManager._permissionsOfItem(atPath: url.path)
 #if canImport(Darwin)
                 let expected = Int(S_IRUSR) | Int(S_IWUSR) | Int(S_IRGRP) | Int(S_IWGRP) | Int(S_IROTH) | Int(S_IWOTH)
+#elseif canImport(Android)
+                let expected = Int(Android.S_IRUSR) | Int(Android.S_IWUSR) | Int(Android.S_IRGRP) | Int(Android.S_IWGRP) | Int(Android.S_IROTH) | Int(Android.S_IWOTH)
 #else
                 let expected = Int(Glibc.S_IRUSR) | Int(Glibc.S_IWUSR) | Int(Glibc.S_IRGRP) | Int(Glibc.S_IWGRP) | Int(Glibc.S_IROTH) | Int(Glibc.S_IWOTH)
 #endif
@@ -612,6 +614,8 @@ class TestNSData: LoopbackServerTest {
                 let permission = try fileManager._permissionsOfItem(atPath: url.path)
 #if canImport(Darwin)
                 let expected = Int(S_IRUSR) | Int(S_IWUSR) | Int(S_IRGRP) | Int(S_IWGRP) | Int(S_IROTH) | Int(S_IWOTH)
+#elseif canImport(Android)
+                let expected = Int(Android.S_IRUSR) | Int(Android.S_IWUSR) | Int(Android.S_IRGRP) | Int(Android.S_IWGRP) | Int(Android.S_IROTH) | Int(Android.S_IWOTH)
 #else
                 let expected = Int(Glibc.S_IRUSR) | Int(Glibc.S_IWUSR) | Int(Glibc.S_IRGRP) | Int(Glibc.S_IWGRP) | Int(Glibc.S_IROTH) | Int(Glibc.S_IWOTH)
 #endif

Tests/Foundation/Tests/TestTimeZone.swift

@@ -160,7 +160,12 @@ class TestTimeZone: XCTestCase {
         var lt = tm()
         localtime_r(&t, &lt)
         let zoneName = NSTimeZone.system.abbreviation() ?? "Invalid Abbreviation"
-        let expectedName = String(cString: lt.tm_zone, encoding: .ascii) ?? "Invalid Zone"
+        // tm_zone is nullable in the Android NDK only.
+        let tm_zone: UnsafePointer<CChar>? = lt.tm_zone
+        guard let tm_zone else {
+            return
+        }
+        let expectedName = String(cString: tm_zone, encoding: .ascii) ?? "Invalid Zone"
         XCTAssertEqual(zoneName, expectedName, "expected name \"\(expectedName)\" is not equal to \"\(zoneName)\"")
     }
 #endif

Tests/Foundation/main.swift

@@ -13,6 +13,8 @@
     import Darwin
 #elseif canImport(Glibc)
     import Glibc
+#elseif canImport(Android)
+    import Android
 #elseif canImport(CRT)
     import CRT
 #endif