diff --git a/test/unit/node/wrapper.test.ts b/test/unit/node/wrapper.test.ts
new file mode 100644
index 000000000..7c8a6bf05
--- /dev/null
+++ b/test/unit/node/wrapper.test.ts
@@ -0,0 +1,18 @@
+import { ChildProcess } from "child_process"
+import { ParentProcess, isChild } from "../../../src/node/wrapper"
+
+describe("wrapper", () => {
+  describe("isChild", () => {
+    it("should return false for parent process", () => {
+      const p = new ParentProcess("1")
+      expect(isChild(p)).toBe(false)
+    })
+  })
+  it("should return false for parent process", () => {
+    const p = new ChildProcess()
+    // our ChildProcess isn't exported
+    // and shouldn't be for a test so surpressing TS error.
+    // @ts-expect-error
+    expect(isChild(p)).toBe(false)
+  })
+})