diff --git a/Tests/TestingTests/ConfirmationTests.swift b/Tests/TestingTests/ConfirmationTests.swift
index c4f076268..2551513eb 100644
--- a/Tests/TestingTests/ConfirmationTests.swift
+++ b/Tests/TestingTests/ConfirmationTests.swift
@@ -10,6 +10,10 @@
 
 @testable @_spi(Experimental) @_spi(ForToolsIntegrationOnly) import Testing
 
+#if canImport(Foundation)
+private import Foundation
+#endif
+
 @Suite("Confirmation Tests")
 struct ConfirmationTests {
   @Test("Successful confirmations")
diff --git a/Tests/TestingTests/MiscellaneousTests.swift b/Tests/TestingTests/MiscellaneousTests.swift
index b4b12a217..9ae326afe 100644
--- a/Tests/TestingTests/MiscellaneousTests.swift
+++ b/Tests/TestingTests/MiscellaneousTests.swift
@@ -12,6 +12,10 @@
 @_spi(Experimental) @_spi(ForToolsIntegrationOnly) import _TestDiscovery
 private import _TestingInternals
 
+#if canImport(Foundation)
+private import Foundation
+#endif
+
 @Test(/* name unspecified */ .hidden)
 @Sendable func freeSyncFunction() {}
 @Sendable func freeAsyncFunction() async {}
diff --git a/Tests/TestingTests/SwiftPMTests.swift b/Tests/TestingTests/SwiftPMTests.swift
index 6e7be0f15..eadde29a7 100644
--- a/Tests/TestingTests/SwiftPMTests.swift
+++ b/Tests/TestingTests/SwiftPMTests.swift
@@ -11,6 +11,10 @@
 @testable @_spi(Experimental) @_spi(ForToolsIntegrationOnly) import Testing
 private import _TestingInternals
 
+#if canImport(Foundation)
+private import Foundation
+#endif
+
 private func configurationForEntryPoint(withArguments args: [String]) throws -> Configuration {
   let args = try parseCommandLineArguments(from: args)
   return try configurationForEntryPoint(from: args)
diff --git a/Tests/TestingTests/Traits/TagListTests.swift b/Tests/TestingTests/Traits/TagListTests.swift
index 1ec8d1248..81cba285c 100644
--- a/Tests/TestingTests/Traits/TagListTests.swift
+++ b/Tests/TestingTests/Traits/TagListTests.swift
@@ -11,6 +11,10 @@
 @testable @_spi(Experimental) @_spi(ForToolsIntegrationOnly) import Testing
 private import _TestingInternals
 
+#if canImport(Foundation)
+private import Foundation
+#endif
+
 @Suite("Tag/Tag List Tests", .tags(.traitRelated))
 struct TagListTests {
   @Test(".tags() factory method with one tag")
diff --git a/Tests/TestingTests/Traits/TimeLimitTraitTests.swift b/Tests/TestingTests/Traits/TimeLimitTraitTests.swift
index 49412b6af..7d427f259 100644
--- a/Tests/TestingTests/Traits/TimeLimitTraitTests.swift
+++ b/Tests/TestingTests/Traits/TimeLimitTraitTests.swift
@@ -10,6 +10,10 @@
 
 @testable @_spi(Experimental) @_spi(ForToolsIntegrationOnly) import Testing
 
+#if canImport(Foundation)
+private import Foundation
+#endif
+
 @Suite("TimeLimitTrait Tests", .tags(.traitRelated))
 struct TimeLimitTraitTests {
   @available(_clockAPI, *)