Tests: Only test debug build configuration on Windows

Sources/_InternalTestSupport/BuildSystemProvider+Supported.swift

@@ -12,6 +12,8 @@
 
 import struct SPMBuildCore.BuildSystemProvider
 import enum PackageModel.BuildConfiguration
+import struct Basics.Environment
+import struct Basics.EnvironmentKey
 
 public var SupportedBuildSystemOnAllPlatforms: [BuildSystemProvider.Kind] = BuildSystemProvider.Kind.allCases.filter { $0 != .xcode }
 
@@ -28,10 +30,29 @@ public struct BuildData {
     public let config: BuildConfiguration
 }
 
+package let TEST_ONLY_DEBUG_ENV_VAR = EnvironmentKey("SWIFTPM_TEST_ONLY_DEBUG_BUILD_CONFIGURATION")
 public func getBuildData(for buildSystems: [BuildSystemProvider.Kind]) -> [BuildData] {
-    buildSystems.flatMap { buildSystem in
-        BuildConfiguration.allCases.compactMap { config in
+    let buildConfigurations: [BuildConfiguration]
+    if let value = Environment.current[TEST_ONLY_DEBUG_ENV_VAR], value.isTruthy {
+        buildConfigurations = [.debug]
+    } else {
+        buildConfigurations = BuildConfiguration.allCases
+    }
+    return buildSystems.flatMap { buildSystem in
+        buildConfigurations.compactMap { config in
             return BuildData(buildSystem: buildSystem, config: config)
         }
     }
 }
+
+
+extension String {
+    package var isTruthy: Bool {
+        switch self.lowercased() {
+        case "true", "1", "yes":
+            return true
+        default:
+            return false
+        }
+    }
+}

Tests/_InternalTestSupportTests/BuildSystemProviderSupportedTests.swift

@@ -0,0 +1,56 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift open source project
+//
+// Copyright (c) 2024-2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See http://swift.org/LICENSE.txt for license information
+// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
+import _InternalTestSupport
+import Testing
+import struct SPMBuildCore.BuildSystemProvider
+import enum PackageModel.BuildConfiguration
+import struct Basics.Environment
+
+@Suite(
+    .tags(
+        .TestSize.small,
+    )
+)
+struct BuildSystemProviderSupportedTests {
+
+    @Test(
+        .serialized,
+        arguments: [
+            [BuildSystemProvider.Kind.native],
+            [BuildSystemProvider.Kind.native, .xcode],
+            [BuildSystemProvider.Kind.native, .xcode, .swiftbuild],
+        ], [true, false],
+    )
+    func getBuildDataReturnsExpectedTests(
+        buildSystemsUT: [BuildSystemProvider.Kind],
+        setEnvironmantVariable: Bool,
+    ) async throws {
+        let expectedCount: Int
+        let customEnv: Environment
+
+        if setEnvironmantVariable {
+            expectedCount = buildSystemsUT.count
+            customEnv = [TEST_ONLY_DEBUG_ENV_VAR : "true"]
+        } else {
+            expectedCount = buildSystemsUT.count * BuildConfiguration.allCases.count
+            customEnv = [:]
+        }
+
+        try Environment.makeCustom(customEnv) {
+            let actual = getBuildData(for: buildSystemsUT)
+
+            #expect(actual.count == expectedCount)
+        }
+
+    }
+}

Tests/_InternalTestSupportTests/String+ExtensionTests.swift

@@ -0,0 +1,53 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift open source project
+//
+// Copyright (c) 2024-2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See http://swift.org/LICENSE.txt for license information
+// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
+import _InternalTestSupport
+import Testing
+
+@Suite(
+    .tags(
+        .TestSize.small,
+    )
+)
+struct StringExtensionTests {
+
+    @Test(
+        arguments: [
+            (value: "", expected: false),
+            (value: " ", expected: false),
+            (value: "0", expected: false),
+            (value: "1", expected: true),
+            (value: "true", expected: true),
+            (value: "True", expected: true),
+            (value: "TrUe", expected: true),
+            (value: "ftrue", expected: false),
+            (value: "truef", expected: false),
+            (value: "ftruef", expected: false),
+            (value: "YES", expected: true),
+            (value: "YEs", expected: true),
+            (value: "yEs", expected: true),
+            (value: "yes", expected: true),
+            (value: "fyes", expected: false),
+            (value: "yesf", expected: false),
+            (value: "fyesf", expected: false),
+            (value: "11", expected: false),
+        ],
+    )
+    func isTruthyReturnsCorrectValue(
+        valueUT: String,
+        expected: Bool,
+    ) async throws {
+        let actual = valueUT.isTruthy
+
+        #expect(actual == expected, "Value \(valueUT) should be \(expected)")
+    }
+}

Utilities/build-using-self

@@ -136,6 +136,10 @@ def is_on_darwin() -> bool:
     return platform.system() == "Darwin"
 
 
+def is_on_windows() -> bool:
+    return platform.system() == "Windows"
+
+
 def set_environment(
     *,
     swiftpm_bin_dir: pathlib.Path,
@@ -147,6 +151,10 @@ def set_environment(
         sdk_root = call_output(shlex.split("xcrun --show-sdk-path --sdk macosx"))
         logging.debug("macos sdk root = %r", sdk_root)
         os.environ["SDKROOT"] = sdk_root
+
+    if is_on_windows():
+        # GH #9159: Temprorarily set this environment until we figure out why the Windows internal CI is hanging
+        os.environ["SWIFTPM_TEST_ONLY_DEBUG_BUILD_CONFIGURATION"] = "true"
     log_environment()