diff --git a/Sources/ToolsProtocolsTestSupport/Assertions.swift b/Sources/ToolsProtocolsTestSupport/Assertions.swift
index 4d621706..faf96c05 100644
--- a/Sources/ToolsProtocolsTestSupport/Assertions.swift
+++ b/Sources/ToolsProtocolsTestSupport/Assertions.swift
@@ -10,6 +10,7 @@
 //
 //===----------------------------------------------------------------------===//
 
+#if canImport(XCTest)
 package import XCTest
 
 /// Same as `XCTAssertNoThrow` but executes the trailing closure.
@@ -181,3 +182,4 @@ package nonisolated func fulfillmentOfOrThrow(
     throw ExpectationNotFulfilledError(expectations: expectations)
   }
 }
+#endif
diff --git a/Sources/ToolsProtocolsTestSupport/CheckCoding.swift b/Sources/ToolsProtocolsTestSupport/CheckCoding.swift
index 278d158d..5019a758 100644
--- a/Sources/ToolsProtocolsTestSupport/CheckCoding.swift
+++ b/Sources/ToolsProtocolsTestSupport/CheckCoding.swift
@@ -10,6 +10,7 @@
 //
 //===----------------------------------------------------------------------===//
 
+#if canImport(XCTest)
 import Foundation
 import XCTest
 
@@ -112,3 +113,4 @@ package func checkCoding<T: Codable>(
 
   body(decodedValue)
 }
+#endif
diff --git a/Sources/ToolsProtocolsTestSupport/PerfTestCase.swift b/Sources/ToolsProtocolsTestSupport/PerfTestCase.swift
index ba716c49..badcbfe1 100644
--- a/Sources/ToolsProtocolsTestSupport/PerfTestCase.swift
+++ b/Sources/ToolsProtocolsTestSupport/PerfTestCase.swift
@@ -10,6 +10,7 @@
 //
 //===----------------------------------------------------------------------===//
 
+#if canImport(XCTest)
 public import XCTest
 
 /// Base class for a performance test case in SourceKit-LSP.
@@ -52,3 +53,4 @@ open class PerfTestCase: XCTestCase {
   #endif
 
 }
+#endif
diff --git a/Sources/ToolsProtocolsTestSupport/RepeatUntilExpectedResult.swift b/Sources/ToolsProtocolsTestSupport/RepeatUntilExpectedResult.swift
index 4ed718f4..34654051 100644
--- a/Sources/ToolsProtocolsTestSupport/RepeatUntilExpectedResult.swift
+++ b/Sources/ToolsProtocolsTestSupport/RepeatUntilExpectedResult.swift
@@ -10,6 +10,7 @@
 //
 //===----------------------------------------------------------------------===//
 
+#if canImport(XCTest)
 import SKLogging
 @_spi(SourceKitLSP) import ToolsProtocolsSwiftExtensions
 import XCTest
@@ -35,3 +36,4 @@ package func repeatUntilExpectedResult(
   }
   XCTFail("Failed to get expected result", file: file, line: line)
 }
+#endif
diff --git a/Sources/ToolsProtocolsTestSupport/TestJSONRPCConnection.swift b/Sources/ToolsProtocolsTestSupport/TestJSONRPCConnection.swift
index 7680cfce..d936cb22 100644
--- a/Sources/ToolsProtocolsTestSupport/TestJSONRPCConnection.swift
+++ b/Sources/ToolsProtocolsTestSupport/TestJSONRPCConnection.swift
@@ -10,6 +10,7 @@
 //
 //===----------------------------------------------------------------------===//
 
+#if canImport(XCTest)
 public import LanguageServerProtocol
 package import LanguageServerProtocolTransport
 @_spi(SourceKitLSP) import ToolsProtocolsSwiftExtensions
@@ -233,3 +234,4 @@ package struct EchoNotification: NotificationType {
     self.string = string
   }
 }
+#endif