Add some missing assertions in pkg/client/client_test.go.

Signed-off-by: Matt Moyer <moyerm@vmware.com>

pkg/client/client_test.go

@@ -78,6 +78,8 @@ func TestExchangeToken(t *testing.T) {
 
 		// Start a test server that returns successfully and asserts various properties of the request.
 		caBundle, endpoint := startTestServer(t, func(w http.ResponseWriter, r *http.Request) {
+			require.Equal(t, http.MethodPost, r.Method)
+			require.Equal(t, "/apis/placeholder.suzerain-io.github.io/v1alpha1/loginrequests", r.URL.Path)
 			require.Equal(t, "application/json", r.Header.Get("content-type"))
 
 			body, err := ioutil.ReadAll(r.Body)