diff --git a/Sources/Integration/Suite.swift b/Sources/Integration/Suite.swift
index f5dda125..416ac653 100644
--- a/Sources/Integration/Suite.swift
+++ b/Sources/Integration/Suite.swift
@@ -52,8 +52,9 @@ struct IntegrationSuite: AsyncParsableCommand {
     }()
 
     private static var authentication: Authentication? {
-        guard let password = ProcessInfo.processInfo.environment["REGISTRY_TOKEN"],
-            let username = ProcessInfo.processInfo.environment["REGISTRY_USERNAME"]
+        let env = ProcessInfo.processInfo.environment
+        guard let password = env["REGISTRY_TOKEN"],
+            let username = env["REGISTRY_USERNAME"]
         else {
             return nil
         }
diff --git a/Tests/ContainerizationExtrasTests/UInt8+DataBindingTest.swift b/Tests/ContainerizationExtrasTests/UInt8+DataBindingTest.swift
index 14484950..4ed2f852 100644
--- a/Tests/ContainerizationExtrasTests/UInt8+DataBindingTest.swift
+++ b/Tests/ContainerizationExtrasTests/UInt8+DataBindingTest.swift
@@ -17,8 +17,6 @@
 
 import Testing
 
-@testable import ContainerizationNetlink
-
 struct BufferTest {
     @Test func testBufferBind() throws {
         let expectedValue: UInt64 = 0x0102_0304_0506_0708
diff --git a/Tests/ContainerizationOCITests/RegistryClientTests.swift b/Tests/ContainerizationOCITests/RegistryClientTests.swift
index ba6bc896..32d316a6 100644
--- a/Tests/ContainerizationOCITests/RegistryClientTests.swift
+++ b/Tests/ContainerizationOCITests/RegistryClientTests.swift
@@ -308,8 +308,8 @@ struct OCIClientTests: ~Copyable {
 
     static var authentication: Authentication? {
         let env = ProcessInfo.processInfo.environment
-        guard let password = ProcessInfo.processInfo.environment["REGISTRY_TOKEN"],
-            let username = ProcessInfo.processInfo.environment["REGISTRY_USERNAME"]
+        guard let password = env["REGISTRY_TOKEN"],
+            let username = env["REGISTRY_USERNAME"]
         else {
             return nil
         }
diff --git a/Tests/ContainerizationTests/ImageTests/ContainsAuth.swift b/Tests/ContainerizationTests/ImageTests/ContainsAuth.swift
index d06309dd..e40e3239 100644
--- a/Tests/ContainerizationTests/ImageTests/ContainsAuth.swift
+++ b/Tests/ContainerizationTests/ImageTests/ContainsAuth.swift
@@ -29,8 +29,8 @@ extension ContainsAuth {
 
     static var authentication: Authentication? {
         let env = ProcessInfo.processInfo.environment
-        guard let password = ProcessInfo.processInfo.environment["REGISTRY_TOKEN"],
-            let username = ProcessInfo.processInfo.environment["REGISTRY_USERNAME"]
+        guard let password = env["REGISTRY_TOKEN"],
+            let username = env["REGISTRY_USERNAME"]
         else {
             return nil
         }
diff --git a/Tests/SendablePropertyMacrosTests/SendablePropertyMacrosTests.swift b/Tests/SendablePropertyMacrosTests/SendablePropertyMacrosTests.swift
index dd56dd3b..696f9476 100644
--- a/Tests/SendablePropertyMacrosTests/SendablePropertyMacrosTests.swift
+++ b/Tests/SendablePropertyMacrosTests/SendablePropertyMacrosTests.swift
@@ -26,7 +26,8 @@ import XCTest
 #if canImport(SendablePropertyMacros)
 import SendablePropertyMacros
 
-let testMacros: [String: Macro.Type] = [
+// testMacros is thread-safe.
+nonisolated(unsafe) let testMacros: [String: Macro.Type] = [
     "SendableProperty": SendablePropertyMacro.self
 ]
 #endif