diff --git a/Tests/CommandsTests/BuildCommandTests.swift b/Tests/CommandsTests/BuildCommandTests.swift
index ec94f9cb9a5..589a3289d87 100644
--- a/Tests/CommandsTests/BuildCommandTests.swift
+++ b/Tests/CommandsTests/BuildCommandTests.swift
@@ -142,7 +142,7 @@ final class BuildCommandTests: CommandsTestCase {
                     stderr.contains(
                         "error: Target A imports another target (B) in the package without declaring it a dependency."
                     ),
-                    "got stdout: \(stdout), stderr: \(stderr)"
+                    "got stdout: \(String(describing: stdout)), stderr: \(String(describing: stderr))"
                 )
             }
         }
@@ -159,7 +159,7 @@ final class BuildCommandTests: CommandsTestCase {
                     stderr.contains(
                         "warning: Target A imports another target (B) in the package without declaring it a dependency."
                     ),
-                    "got stdout: \(stdout), stderr: \(stderr)"
+                    "got stdout: \(String(describing: stdout)), stderr: \(String(describing: stderr))"
                 )
             }
         }
diff --git a/Tests/CommandsTests/PackageCommandTests.swift b/Tests/CommandsTests/PackageCommandTests.swift
index 15064647b12..c644958b077 100644
--- a/Tests/CommandsTests/PackageCommandTests.swift
+++ b/Tests/CommandsTests/PackageCommandTests.swift
@@ -2522,27 +2522,27 @@ final class PackageCommandTests: CommandsTestCase {
 
         // Overall configuration: debug, plugin build request: debug -> without testability
         try await fixture(name: "Miscellaneous/Plugins/CommandPluginTestStub") { fixturePath in
-            try await XCTAssertAsyncNoThrow(try await SwiftPM.Package.execute(["-c", "debug", "check-testability", "InternalModule", "debug", "true"], packagePath: fixturePath))
+            await XCTAssertAsyncNoThrow(try await SwiftPM.Package.execute(["-c", "debug", "check-testability", "InternalModule", "debug", "true"], packagePath: fixturePath))
         }
 
         // Overall configuration: debug, plugin build request: release -> without testability
         try await fixture(name: "Miscellaneous/Plugins/CommandPluginTestStub") { fixturePath in
-            try await XCTAssertAsyncNoThrow(try await SwiftPM.Package.execute(["-c", "debug", "check-testability", "InternalModule", "release", "false"], packagePath: fixturePath))
+            await XCTAssertAsyncNoThrow(try await SwiftPM.Package.execute(["-c", "debug", "check-testability", "InternalModule", "release", "false"], packagePath: fixturePath))
         }
 
         // Overall configuration: release, plugin build request: debug -> with testability
         try await fixture(name: "Miscellaneous/Plugins/CommandPluginTestStub") { fixturePath in
-            try await XCTAssertAsyncNoThrow(try await SwiftPM.Package.execute(["-c", "release", "check-testability", "InternalModule", "debug", "true"], packagePath: fixturePath))
+            await XCTAssertAsyncNoThrow(try await SwiftPM.Package.execute(["-c", "release", "check-testability", "InternalModule", "debug", "true"], packagePath: fixturePath))
         }
 
         // Overall configuration: release, plugin build request: release -> with testability
         try await fixture(name: "Miscellaneous/Plugins/CommandPluginTestStub") { fixturePath in
-            try await XCTAssertAsyncNoThrow(try await SwiftPM.Package.execute(["-c", "release", "check-testability", "InternalModule", "release", "false"], packagePath: fixturePath))
+            await XCTAssertAsyncNoThrow(try await SwiftPM.Package.execute(["-c", "release", "check-testability", "InternalModule", "release", "false"], packagePath: fixturePath))
         }
 
         // Overall configuration: release, plugin build request: release including tests -> with testability
         try await fixture(name: "Miscellaneous/Plugins/CommandPluginTestStub") { fixturePath in
-            try await XCTAssertAsyncNoThrow(try await SwiftPM.Package.execute(["-c", "release", "check-testability", "all-with-tests", "release", "true"], packagePath: fixturePath))
+            await XCTAssertAsyncNoThrow(try await SwiftPM.Package.execute(["-c", "release", "check-testability", "all-with-tests", "release", "true"], packagePath: fixturePath))
         }
     }
 
diff --git a/Tests/FunctionalTests/TraitTests.swift b/Tests/FunctionalTests/TraitTests.swift
index e1164eea6e1..722782216d1 100644
--- a/Tests/FunctionalTests/TraitTests.swift
+++ b/Tests/FunctionalTests/TraitTests.swift
@@ -19,7 +19,7 @@ import XCTest
 final class TraitTests: XCTestCase {
     func testTraits_whenNoFlagPassed() async throws {
         try await fixture(name: "Traits") { fixturePath in
-            let (stdout, stderr) = try await executeSwiftRun(fixturePath.appending("Example"), "Example")
+            let (stdout, _) = try await executeSwiftRun(fixturePath.appending("Example"), "Example")
             // We expect no warnings to be produced. Specifically no unused dependency warnings.
             // When fixed, GitHub issue #8131 should re-enable the below assert.
             // XCTAssertFalse(stderr.contains("warning:"))
@@ -38,7 +38,7 @@ final class TraitTests: XCTestCase {
 
     func testTraits_whenTraitUnification() async throws {
         try await fixture(name: "Traits") { fixturePath in
-            let (stdout, stderr) = try await executeSwiftRun(fixturePath.appending("Example"), "Example", extraArgs: ["--traits", "default,Package9,Package10"])
+            let (stdout, _) = try await executeSwiftRun(fixturePath.appending("Example"), "Example", extraArgs: ["--traits", "default,Package9,Package10"])
             // We expect no warnings to be produced. Specifically no unused dependency warnings.
             // When fixed, GitHub issue #8131 should re-enable the below assert.
             // XCTAssertFalse(stderr.contains("warning:"))
@@ -61,7 +61,7 @@ final class TraitTests: XCTestCase {
 
     func testTraits_whenTraitUnification_whenSecondTraitNotEnabled() async throws {
         try await fixture(name: "Traits") { fixturePath in
-            let (stdout, stderr) = try await executeSwiftRun(fixturePath.appending("Example"), "Example", extraArgs: ["--traits", "default,Package9"])
+            let (stdout, _) = try await executeSwiftRun(fixturePath.appending("Example"), "Example", extraArgs: ["--traits", "default,Package9"])
             // We expect no warnings to be produced. Specifically no unused dependency warnings.
             // When fixed, GitHub issue #8131 should re-enable the below assert.
             // XCTAssertFalse(stderr.contains("warning:"))
@@ -82,7 +82,7 @@ final class TraitTests: XCTestCase {
 
     func testTraits_whenIndividualTraitsEnabled_andDefaultTraits() async throws {
         try await fixture(name: "Traits") { fixturePath in
-            let (stdout, stderr) = try await executeSwiftRun(fixturePath.appending("Example"), "Example", extraArgs: ["--traits", "default,Package5,Package7,BuildCondition3"])
+            let (stdout, _) = try await executeSwiftRun(fixturePath.appending("Example"), "Example", extraArgs: ["--traits", "default,Package5,Package7,BuildCondition3"])
             // We expect no warnings to be produced. Specifically no unused dependency warnings.
             // When fixed, GitHub issue #8131 should re-enable the below assert.
             // XCTAssertFalse(stderr.contains("warning:"))
@@ -119,7 +119,7 @@ final class TraitTests: XCTestCase {
 
     func testTraits_whenIndividualTraitsEnabled_andDefaultTraitsDisabled() async throws {
         try await fixture(name: "Traits") { fixturePath in
-            let (stdout, stderr) = try await executeSwiftRun(fixturePath.appending("Example"), "Example", extraArgs: ["--traits", "Package5,Package7"])
+            let (stdout, _) = try await executeSwiftRun(fixturePath.appending("Example"), "Example", extraArgs: ["--traits", "Package5,Package7"])
             // We expect no warnings to be produced. Specifically no unused dependency warnings.
             // When fixed, GitHub issue #8131 should re-enable the below assert.
             // XCTAssertFalse(stderr.contains("warning:"))
@@ -137,7 +137,7 @@ final class TraitTests: XCTestCase {
 
     func testTraits_whenAllTraitsEnabled() async throws {
         try await fixture(name: "Traits") { fixturePath in
-            let (stdout, stderr) = try await executeSwiftRun(fixturePath.appending("Example"), "Example", extraArgs: ["--enable-all-traits"])
+            let (stdout, _) = try await executeSwiftRun(fixturePath.appending("Example"), "Example", extraArgs: ["--enable-all-traits"])
             // We expect no warnings to be produced. Specifically no unused dependency warnings.
             // GitHub issue #8131
             // XCTAssertFalse(stderr.contains("warning:"))
@@ -163,7 +163,7 @@ final class TraitTests: XCTestCase {
 
     func testTraits_whenAllTraitsEnabled_andDefaultTraitsDisabled() async throws {
         try await fixture(name: "Traits") { fixturePath in
-            let (stdout, stderr) = try await executeSwiftRun(fixturePath.appending("Example"), "Example", extraArgs: ["--enable-all-traits", "--disable-default-traits"])
+            let (stdout, _) = try await executeSwiftRun(fixturePath.appending("Example"), "Example", extraArgs: ["--enable-all-traits", "--disable-default-traits"])
             // We expect no warnings to be produced. Specifically no unused dependency warnings.
             // GitHub issue #8131
             // XCTAssertFalse(stderr.contains("warning:"))
diff --git a/Tests/WorkspaceTests/WorkspaceTests.swift b/Tests/WorkspaceTests/WorkspaceTests.swift
index d4296f32302..568f184142d 100644
--- a/Tests/WorkspaceTests/WorkspaceTests.swift
+++ b/Tests/WorkspaceTests/WorkspaceTests.swift
@@ -8684,7 +8684,6 @@ final class WorkspaceTests: XCTestCase {
 
         let maxConcurrentRequests = 2
         let concurrentRequests = ThreadSafeBox(0)
-        let concurrentRequestsLock = NSLock()
 
         var configuration = HTTPClient.Configuration()
         configuration.maxConcurrentRequests = maxConcurrentRequests