diff --git a/src/testing/test-coerce-global.d.ts b/src/testing/test-coerce-global.d.ts
new file mode 100644
index 000000000..cc1e618be
--- /dev/null
+++ b/src/testing/test-coerce-global.d.ts
@@ -0,0 +1,5 @@
+declare global {
+	function testCoerce<TValue>(value: TValue): TValue
+}
+
+export {}
diff --git a/test-setup.ts b/test-setup.ts
index e66350edb..6fbecdd57 100644
--- a/test-setup.ts
+++ b/test-setup.ts
@@ -11,6 +11,8 @@ const { restoreModuleMocks } = installModuleMockLifecycle(mock)
 let environmentSnapshot: NodeJS.ProcessEnv = { ...process.env }
 let workingDirectorySnapshot = process.cwd()
 
+globalThis.testCoerce = <TValue>(value: TValue): TValue => value
+
 function cleanupOmoCacheDir(cacheDir: string): void {
   rmSync(cacheDir, { recursive: true, force: true })
 }