diff --git a/src/request.spec.ts b/src/request.spec.ts
index a97e853e..ea59e749 100755
--- a/src/request.spec.ts
+++ b/src/request.spec.ts
@@ -746,6 +746,11 @@ describe('Request', () => {
       const request = new Request(methodDescriptor, { differentParam: 'abc123' })
       expect(request.body()).toEqual('abc123')
     })
+
+    it('can return undefined', () => {
+      const request = new Request(methodDescriptor, { ...requestParams, body: undefined })
+      expect(request.body()).toBeUndefined()
+    })
   })
 
   describe('#auth', () => {
@@ -763,6 +768,11 @@ describe('Request', () => {
       const request = new Request(methodDescriptor, { differentAuthParam: authData })
       expect(request.auth()).toEqual(authData)
     })
+
+    it('can return undefined', () => {
+      const request = new Request(methodDescriptor, { ...requestParams, auth: undefined })
+      expect(request.auth()).toBeUndefined()
+    })
   })
 
   describe('#timeout', () => {
@@ -779,6 +789,11 @@ describe('Request', () => {
       const request = new Request(methodDescriptor, { differentTimeoutParam: 1000 })
       expect(request.timeout()).toEqual(1000)
     })
+
+    it('can return undefined', () => {
+      const request = new Request(methodDescriptor, { ...requestParams, timeout: undefined })
+      expect(request.timeout()).toBeUndefined()
+    })
   })
 
   describe('#signal', () => {
@@ -800,6 +815,11 @@ describe('Request', () => {
       })
       expect(request.signal()).toEqual(abortController.signal)
     })
+
+    it('can return undefined', () => {
+      const request = new Request(methodDescriptor, requestParams)
+      expect(request.signal()).toBeUndefined()
+    })
   })
 
   describe('#isBinary', () => {