tests: Enable EndToEnd tests on macOS

The EndToEnd tests no longer deadlock under `swift test` and can
now be run on macOS.

The CI cannot currently run the end to end tests because SDK generator
cannot use the CI HTTP proxy to download packages.   This commit
enables the tests on macOS, so they can be run locally, but disables
them in CI by skipping them in Utilities/test.sh.

Fixes: #143

Author: euanh

Tests/SwiftSDKGeneratorTests/EndToEndTests.swift

@@ -66,7 +66,6 @@ final class EndToEndTests: XCTestCase {
   // This takes a lock on `.build`, but if the tests are being run by `swift test` the outer Swift Package Manager
   // instance will already hold this lock, causing the test to deadlock.   We can work around this by giving
   // the `swift run swift-sdk-generator` instance its own scratch directory.
-  #if !os(macOS)
   func buildSDK(inDirectory packageDirectory: FilePath, scratchPath: String, withArguments runArguments: String) async throws -> String {
     let generatorOutput = try await Shell.readStdout(
       "cd \(packageDirectory) && swift run --scratch-path \(scratchPath) swift-sdk-generator \(runArguments)"
@@ -161,5 +160,4 @@ final class EndToEndTests: XCTestCase {
       }
     }
   }
-  #endif
 }

Utilities/test.sh

@@ -14,7 +14,7 @@
 set -ex
 
 if [ "$(uname)" = Darwin ]; then
-    swift test $@
+    swift test --skip EndToEndTests $@
 else
     swift build --build-tests $@
 fi