Tests: Migrate MiscellaneousTests to Swift Testing and augment

Migrate the `MiscellaneousTests` suite to Swift Testing and augment
the test to run against both the Native and SwiftBuild build system, in
addition to the `debug`` and `release` build configuration.

Depends on: #9013
Relates to: #8997
issue: rdar://157669245

Author: bkhouri

Sources/Basics/Process.swift

@@ -35,6 +35,8 @@ extension ProcessInfo {
         .freebsd
         #elseif os(OpenBSD)
         .openbsd
+        #elseif os(Android)
+        .android
         #else
         .unknown
         #endif

Sources/_InternalTestSupport/BuildSystemProvider+Configuration.swift

@@ -56,11 +56,7 @@ extension BuildSystemProvider.Kind {
         if let triple {
             tripleString = triple
         } else {
-            do {
-                tripleString = try UserToolchain.default.targetTriple.platformBuildPathComponent
-            } catch {
-                tripleString = ""
-            }
+            tripleString = try UserToolchain.default.targetTriple.platformBuildPathComponent
         }
         switch self {
         case .native:

Sources/_InternalTestSupport/SwiftPMProduct.swift

@@ -56,7 +56,7 @@ extension SwiftPM {
     }
 
     public var xctestBinaryPath: AbsolutePath {
-        Self.xctestBinaryPath(for: RelativePath("swift-package-manager"))
+        Self.xctestBinaryPath(for: RelativePath(self.executableName))
     }
 
     public static func xctestBinaryPath(for executableName: RelativePath) -> AbsolutePath {

Sources/_InternalTestSupport/SwiftTesting+Helpers.swift

@@ -37,6 +37,17 @@ public func expectFileExists(
     )
 }
 
+public func requireFileExists(
+    at path: AbsolutePath,
+    sourceLocation: SourceLocation = #_sourceLocation,
+) throws {
+    try #require(
+        localFileSystem.exists(path),
+        "File '\(path)' does not exist.",
+        sourceLocation: sourceLocation,
+    )
+}
+
 public func expectFileDoesNotExists(
     at path: AbsolutePath,
     _ comment: Comment? = nil,

Sources/_InternalTestSupport/SwiftTesting+TraitsBug.swift

@@ -48,6 +48,13 @@ extension Trait where Self == Testing.Bug {
         )
     }
 
+    public static var IssueWindowsAbsoluteAndRelativePathTestFailures: Self {
+        issue(
+            "https://github.com/swiftlang/swift-package-manager/issues/8511",
+            relationship: .defect,
+        )
+    }
+
     public static var IssueWindowsLongPath: Self {
         .issue(
             // "https://github.com/swiftlang/swift-tools-support-core/pull/521",
@@ -84,4 +91,12 @@ extension Trait where Self == Testing.Bug {
             relationship: .defect,
         )
     }
+
+    public static var IssueSwiftBuildSpaceInPath: Self {
+        .issue(
+            "https://github.com/swiftlang/swift-package-manager/issues/8400",
+            relationship: .defect,
+        )
+    }
+
 }