Attempt solution at a custom XFail for XCTest..

Sources/_InternalTestSupport/Commands.swift

@@ -1,8 +1,38 @@
 import SPMBuildCore
 import XCTest
 
+public struct XFailCaseName {
+    let testName: String
+    let reason: String
+
+    public init(_ testName: String, because reason: String) {
+        self.testName = testName
+        self.reason = reason
+    }
+}
 open class BuildSystemProviderTestCase: XCTestCase {
     open var buildSystemProvider: BuildSystemProvider.Kind {
         fatalError("\(self) does not implement \(#function)")
     }
+
+    open var xFailTestCaseNames: [XFailCaseName] {
+        return []
+    }
+
+    override open func recordFailure(withDescription description: String, inFile filePath: String, atLine lineNumber: Int, expected: Bool) {
+        // Get current test name:
+        print("--->> In recordFailure: Test name is >>>\(self.name)<<<")
+
+        if self.xFailTestCaseNames.map({ item in item.testName }).contains(self.name) {
+            // do nothing
+            print("--->> In recordFailure: Test name is >>>\(self.name)<<< is expected to fail, so mark as passed!!")
+        } else {
+            super.recordFailure(
+                withDescription: description,
+                inFile: filePath,
+                atLine: lineNumber,
+                expected: expected
+            )
+        }
+    }
 }

Tests/BuildTests/BuildPlanTests.swift

@@ -6880,17 +6880,34 @@ class BuildPlanSwiftBuildTests: BuildPlanTestCase {
         return .swiftbuild
     }
 
+    override open var xFailTestCaseNames: [XFailCaseName] {
+        return [
+            XFailCaseName(
+                String(describing: testDuplicateProductNamesWithNonDefaultLibsThrowError.self),
+                because: "This test is not expected to fail.. it should pass.",
+            ),
+            XFailCaseName(
+                String(describing: testTargetsWithPackageAccess.self),
+                because: "Skip until swift build system can support this case",
+            ),
+            // XFailCaseName(
+            //     String(describing: testTestModule.self),
+            //     because: "Skip until swift build system can support this case."
+            // )
+        ]
+    }
+
     override func testDuplicateProductNamesWithNonDefaultLibsThrowError() async throws {
         try await super.testDuplicateProductNamesWithNonDefaultLibsThrowError()
     }
 
-    override func testTargetsWithPackageAccess() async throws {
-        throw XCTSkip("Skip until swift build system can support this case.")
-    }
+    // override func testTargetsWithPackageAccess() async throws {
+    //     throw XCTSkip("Skip until swift build system can support this case.")
+    // }
 
-    override func testTestModule() async throws {
-        throw XCTSkip("Skip until swift build system can support this case.")
-    }
+    // override func testTestModule() async throws {
+    //     throw XCTSkip("Skip until swift build system can support this case.")
+    // }
 
     override func testPackageNameFlag() async throws {
 #if os(Windows)

Tests/CommandsTests/RunCommandTests.swift

@@ -19,7 +19,7 @@ import XCTest
 
 import class Basics.AsyncProcess
 
-class RunCommandTestCase: BuildSystemProviderTestCase {
+class RunCommandTestCase: CommandsBuildProviderTestCase {
     override func setUpWithError() throws {
         try XCTSkipIf(type(of: self) == RunCommandTestCase.self, "Pay no attention to the class behind the curtain.")
     }
@@ -291,28 +291,57 @@ class RunCommandSwiftBuildTests: RunCommandTestCase {
         try await super.testUsage()
     }
 
-    override func testMultipleExecutableAndExplicitExecutable() async throws {
-        try XCTSkip("https://github.com/swiftlang/swift-package-manager/issues/8279: Swift run using Swift Build does not output executable content to the terminal")
+    override open var xFailTestCaseNames: [XFailCaseName] {
+        return [
+            XFailCaseName(
+                String(describing: testMultipleExecutableAndExplicitExecutable.self),
+                because: "https://github.com/swiftlang/swift-package-manager/issues/8279: Swift run using Swift Build does not output executable content to the terminal",
+            ),
+            XFailCaseName(
+                String(describing: testUnknownProductAndArgumentPassing.self),
+                because: "https://github.com/swiftlang/swift-package-manager/issues/8279: Swift run using Swift Build does not output executable content to the terminal",
+            ),
+            XFailCaseName(
+                String(describing: testPackageWithExcutableTargetsContainsPlatformConditionalsBuildsSuccessfullyInDebugConfig.self),
+                because: "Test fixture fails to build",
+            ),
+            XFailCaseName(
+                String(describing: testPackageWithExcutableTargetsContainsPlatformConditionalsBuildsSuccessfullyInReleaseConfig.self),
+                because: "Test fixture fails to build",
+            ),
+            XFailCaseName(
+                String(describing: testToolsetDebugger.self),
+                because: "Test fixture fails to build",
+            ),
+            XFailCaseName(
+                String(describing: testUnreachableExecutable.self),
+                because: "Need to investigate test failure",
+            ),
+        ]
     }
 
-    override func testUnknownProductAndArgumentPassing() async throws {
-        try XCTSkip("https://github.com/swiftlang/swift-package-manager/issues/8279: Swift run using Swift Build does not output executable content to the terminal")
-    }
+    // override func testMultipleExecutableAndExplicitExecutable() async throws {
+    //     try XCTSkip("https://github.com/swiftlang/swift-package-manager/issues/8279: Swift run using Swift Build does not output executable content to the terminal")
+    // }
 
-    override func testPackageWithExcutableTargetsContainsPlatformConditionalsBuildsSuccessfullyInDebugConfig() async throws {
-        try XCTSkip("Test fixture fails to build")
-    }
+    // override func testUnknownProductAndArgumentPassing() async throws {
+    //     try XCTSkip("https://github.com/swiftlang/swift-package-manager/issues/8279: Swift run using Swift Build does not output executable content to the terminal")
+    // }
 
-    override func testPackageWithExcutableTargetsContainsPlatformConditionalsBuildsSuccessfullyInReleaseConfig() async throws {
-        try XCTSkip("Test fixture fails to build")
-    }
+    // override func testPackageWithExcutableTargetsContainsPlatformConditionalsBuildsSuccessfullyInDebugConfig() async throws {
+    //     try XCTSkip("Test fixture fails to build")
+    // }
 
-    override func testToolsetDebugger() async throws {
-        try XCTSkip("Test fixture fails to build")
-    }
+    // override func testPackageWithExcutableTargetsContainsPlatformConditionalsBuildsSuccessfullyInReleaseConfig() async throws {
+    //     try XCTSkip("Test fixture fails to build")
+    // }
 
-    override func testUnreachableExecutable() async throws {
-        try XCTSkip("Need to investigate test failure")
-    }
+    // override func testToolsetDebugger() async throws {
+    //     try XCTSkip("Test fixture fails to build")
+    // }
+
+    // override func testUnreachableExecutable() async throws {
+    //     try XCTSkip("Need to investigate test failure")
+    // }
 
 }