Improve Parallel Testing (#3182)

* Fix Sendable warning in RFC1123

* Fix warning with test file

* Fix post assignement in tests

* Revert "Fix Sendable warning in RFC1123"

This reverts commit a85e5cb.

.github/workflows/test.yml

@@ -46,3 +46,13 @@ jobs:
      uses: vapor/ci/.github/workflows/run-unit-tests.yml@main
      with:
        with_tsan: false
+
+  test-parallel:
+    if: ${{ !(github.event.pull_request.draft || false) }}
+    runs-on: ubuntu-latest
+    container: swift:5.10
+    steps:
+      - name: Check out Vapor
+        uses: actions/checkout@v4
+      - name: Run tests
+        run: swift test --parallel

Package.swift

@@ -121,6 +121,7 @@ let package = Package(
             .copy("Utilities/my-secret-env-content"),
             .copy("Utilities/expired.crt"),
             .copy("Utilities/expired.key"),
+            .copy("Utilities/long-test-file.txt"),
         ]),
     ]
 )

Package@swift-5.9.swift

@@ -129,6 +129,7 @@ let package = Package(
                 .copy("Utilities/my-secret-env-content"),
                 .copy("Utilities/expired.crt"),
                 .copy("Utilities/expired.key"),
+                .copy("Utilities/long-test-file.txt"),
             ],
             swiftSettings: [
                 .enableUpcomingFeature("BareSlashRegexLiterals"),

Tests/VaporTests/FileTests.swift

@@ -20,7 +20,7 @@ final class FileTests: XCTestCase {
             }
         }
 
-        try app.testable(method: .running).test(.GET, "/file-stream") { res in
+        try app.testable(method: .running(port: 0)).test(.GET, "/file-stream") { res in
             let test = "the quick brown fox"
             XCTAssertNotNil(res.headers.first(name: .eTag))
             XCTAssertContains(res.body.string, test)
@@ -104,7 +104,7 @@ final class FileTests: XCTestCase {
             }
         }
 
-        try app.testable(method: .running).test(.GET, "/file-stream") { res in
+        try app.testable(method: .running(port: 0)).test(.GET, "/file-stream") { res in
             let fileData = try Data(contentsOf: URL(fileURLWithPath: #file))
             let digest = SHA256.hash(data: fileData)
             let eTag = res.headers.first(name: "etag")
@@ -126,7 +126,7 @@ final class FileTests: XCTestCase {
             }
         }
 
-        try app.testable(method: .running).test(.GET, "/file-stream") { res in
+        try app.testable(method: .running(port: 0)).test(.GET, "/file-stream") { res in
             let attributes = try FileManager.default.attributesOfItem(atPath: #file)
             let modifiedAt = attributes[.modificationDate] as! Date
             let fileSize = (attributes[.size] as? NSNumber)!.intValue