diff --git a/tests/unit/utils/net/http-request-body.spec.ts b/tests/unit/utils/net/http-request-body.spec.ts
new file mode 100644
index 0000000..b03dfb1
--- /dev/null
+++ b/tests/unit/utils/net/http-request-body.spec.ts
@@ -0,0 +1,78 @@
+import { Readable } from "node:stream";
+import { Blob } from "@/utils/net/blob";
+import { isHttpRequestBody, isStreamableHttpRequestBody } from "@/utils/net/http-request-body";
+
+describe("isHttpRequestBody", () => {
+    test("returns true when body is a string", () => {
+        const body = "string body";
+
+        expect(isHttpRequestBody(body)).toBe(true);
+    });
+
+    test("returns true when body is a Blob", () => {
+        const body = new Blob(["blob content"]);
+
+        expect(isHttpRequestBody(body)).toBe(true);
+    });
+
+    test("returns true when body is a Buffer", () => {
+        const body = Buffer.from("buffer content");
+
+        expect(isHttpRequestBody(body)).toBe(true);
+    });
+
+    test("returns true when body is a URLSearchParams", () => {
+        const body = new URLSearchParams({ param: "value" });
+
+        expect(isHttpRequestBody(body)).toBe(true);
+    });
+
+    test("returns true when body is a FormData", () => {
+        const body = new FormData();
+        body.append("key", "value");
+
+        expect(isHttpRequestBody(body)).toBe(true);
+    });
+
+    test("returns true when body is a ReadableStream", () => {
+        const body = Readable.from("stream content");
+
+        expect(isHttpRequestBody(body)).toBe(true);
+    });
+
+    test("returns false when body is not a valid HTTP request body type", () => {
+        expect(isHttpRequestBody({ key: "value" })).toBe(false);
+        expect(isHttpRequestBody(["foo"])).toBe(false);
+        expect(isHttpRequestBody(null)).toBe(false);
+        expect(isHttpRequestBody(undefined)).toBe(false);
+    });
+});
+
+describe("isStreamableHttpRequestBody", () => {
+    test("returns true when body is a Blob", () => {
+        const body = new Blob(["blob content"]);
+
+        expect(isStreamableHttpRequestBody(body)).toBe(true);
+    });
+
+    test("returns true when body is a Buffer", () => {
+        const body = Buffer.from("buffer content");
+
+        expect(isStreamableHttpRequestBody(body)).toBe(true);
+    });
+
+    test("returns true when body is a ReadableStream", () => {
+        const body = Readable.from("stream content");
+
+        expect(isStreamableHttpRequestBody(body)).toBe(true);
+    });
+
+    test("returns false when body is not a valid streamable HTTP request body type", () => {
+        expect(isStreamableHttpRequestBody({ key: "value" })).toBe(false);
+        expect(isStreamableHttpRequestBody(["foo"])).toBe(false);
+        expect(isStreamableHttpRequestBody("string body")).toBe(false);
+        expect(isStreamableHttpRequestBody(new URLSearchParams({ param: "value" }))).toBe(false);
+        expect(isStreamableHttpRequestBody(null)).toBe(false);
+        expect(isStreamableHttpRequestBody(undefined)).toBe(false);
+    });
+});