tests: Build on Linux even though tests are not currently run (#81)

The 'EndToEndTests' are only run on Linux but testing is currently disabled in CI. This makes it likely that the tests will not be built often and allows them to drift out of sync with the code they test without being noticed.

* Use `--build-tests` in the CI wrapper script to ensure that the tests are built in CI, even if they are not run.
* Fix EndToEnd test compilation failures caused by changes in `Shell.readStdout` after PR #77.
* URL.appending(path:) is not available on Linux.   CI runs EndToEnd tests on Linux, so we must use URL.appendingPathComponent()

Author: euanh

Tests/SwiftSDKGeneratorTests/EndToEndTests.swift

@@ -57,8 +57,7 @@ final class EndToEndTests: XCTestCase {
 
     for runArguments in possibleArguments {
       let generatorOutput = try await Shell.readStdout(
-        "swift run swift-sdk-generator \(runArguments)",
-        currentDirectory: packageDirectory
+        "cd \(packageDirectory) && swift run swift-sdk-generator \(runArguments)"
       )
 
       let installCommand = try XCTUnwrap(generatorOutput.split(separator: "\n").first {
@@ -80,26 +79,22 @@ final class EndToEndTests: XCTestCase {
       XCTAssertTrue(installOutput.contains("successfully installed"))
 
       for testcase in testcases {
-        let testPackageURL = FileManager.default.temporaryDirectory.appending(path: "swift-sdk-generator-test")
+        let testPackageURL = FileManager.default.temporaryDirectory.appendingPathComponent("swift-sdk-generator-test")
         let testPackageDir = FilePath(testPackageURL.path)
         try? fm.removeItem(atPath: testPackageDir.string)
         try fm.createDirectory(atPath: testPackageDir.string, withIntermediateDirectories: true)
 
-        try await Shell.run("swift package init --type executable", currentDirectory: testPackageDir)
-        let main_swift = testPackageURL.appending(path: "Sources/main.swift")
+        try await Shell.run("swift package --package-path \(testPackageDir) init --type executable")
+        let main_swift = testPackageURL.appendingPathComponent("Sources/main.swift")
         try testcase.write(to: main_swift, atomically: true, encoding: .utf8)
 
         var buildOutput = try await Shell.readStdout(
-          "swift build --experimental-swift-sdk \(bundleName)",
-          currentDirectory: testPackageDir
+          "swift build --package-path \(testPackageDir) --experimental-swift-sdk \(bundleName)"
         )
         XCTAssertTrue(buildOutput.contains("Build complete!"))
-
-        try await Shell.run("rm -rf .build", currentDirectory: testPackageDir)
-
+        try await Shell.run("rm -rf \(testPackageDir.appending(".build"))")
         buildOutput = try await Shell.readStdout(
-          "swift build --experimental-swift-sdk \(bundleName) --static-swift-stdlib",
-          currentDirectory: testPackageDir
+          "swift build --package-path \(testPackageDir) --experimental-swift-sdk \(bundleName) --static-swift-stdlib"
         )
         XCTAssertTrue(buildOutput.contains("Build complete!"))
       }

Utilities/test.sh

@@ -16,5 +16,5 @@ set -ex
 if [ "$(uname)" = Darwin ]; then
     swift test $@
 else
-    swift build --vv $@
+    swift build --build-tests --vv $@
 fi