Revise the findXcodeToolchain test case to work with more macOS systems

Author: cmcgee1024

Tests/SwiftlyTests/PlatformTests.swift

@@ -91,14 +91,15 @@ import Testing
     @Test(.mockedSwiftlyVersion(), .testHome()) func findXcodeToolchainLocation() async throws {
         // GIVEN: the xcode toolchain
         // AND there is xcode installed
-        guard let xcodeLocation = try? await Swiftly.currentPlatform.runProgramOutput("xcode-select", "-p"), xcodeLocation != "" else {
+        guard let swiftLocation = try? await Swiftly.currentPlatform.runProgramOutput("xcrun", "-f", "swift"), swiftLocation != "" else {
             return
         }
 
         // WHEN: the location of the xcode toolchain can be found
         let toolchainLocation = try await Swiftly.currentPlatform.findToolchainLocation(SwiftlyTests.ctx, .xcodeVersion)
 
-        #expect(toolchainLocation.string.hasPrefix(xcodeLocation.replacingOccurrences(of: "\n", with: "")))
+        // THEN: the xcode toolchain matches the currently selected xcode toolchain
+        #expect(toolchainLocation.string == swiftLocation.replacingOccurrences(of: "\n", with: "").replacingOccurrences(of: "/usr/bin/swift", with: ""))
     }
 #endif