diff --git a/spec/rails_helper.rb b/spec/rails_helper.rb
index fa498afc..5a1fde91 100644
--- a/spec/rails_helper.rb
+++ b/spec/rails_helper.rb
@@ -38,7 +38,6 @@
   config.include(Requests::JsonHelpers, type: :request)
   config.include(Requests::AuthHelpers, type: :request)
   config.include(ActiveSupport::Testing::TimeHelpers)
-  config.include(Generators::FileHelpers, type: :generator)
 
   config.before(:suite) do
     ActionController::Base.allow_forgery_protection = true
diff --git a/spec/requests/graphql_controller_spec.rb b/spec/requests/graphql_controller_spec.rb
new file mode 100644
index 00000000..53fadf10
--- /dev/null
+++ b/spec/requests/graphql_controller_spec.rb
@@ -0,0 +1,80 @@
+require 'rails_helper'
+
+RSpec.describe GraphqlDevise::GraphqlController do
+  let(:password) { 'password123' }
+  let(:user)     { create(:user, :confirmed, password: password) }
+  let(:params)   { { query: query, variables: variables } }
+  let(:request_params) do
+    if Rails::VERSION::MAJOR >= 5
+      { params: params }
+    else
+      params
+    end
+  end
+
+  context 'when variables are a string' do
+    let(:variables) { "{\"email\": \"#{user.email}\"}" }
+    let(:query)     { "mutation($email: String!) { userLogin(email: $email, password: \"#{password}\") { user { email name signInCount } } }" }
+
+    it 'parses the string variables' do
+      post '/api/v1/graphql_auth', request_params
+
+      expect(json_response).to match(
+        data: { userLogin: { user: { email: user.email, name: user.name, signInCount: 1 } } }
+      )
+    end
+
+    context 'when variables is an empty string' do
+      let(:variables) { '' }
+      let(:query)     { "mutation { userLogin(email: \"#{user.email}\", password: \"#{password}\") { user { email name signInCount } } }" }
+
+      it 'returns an empty hash as variables' do
+        post '/api/v1/graphql_auth', request_params
+
+        expect(json_response).to match(
+          data: { userLogin: { user: { email: user.email, name: user.name, signInCount: 1 } } }
+        )
+      end
+    end
+  end
+
+  context 'when variables are not a string or hash' do
+    let(:variables) { 1 }
+    let(:query)     { "mutation($email: String!) { userLogin(email: $email, password: \"#{password}\") { user { email name signInCount } } }" }
+
+    it 'raises an error' do
+      expect do
+        post '/api/v1/graphql_auth', request_params
+      end.to raise_error(ArgumentError)
+    end
+  end
+
+  context 'when multiplexing queries' do
+    let(:params) do
+      {
+        _json: [
+          { query: "mutation { userLogin(email: \"#{user.email}\", password: \"#{password}\") { user { email name signInCount } } }" },
+          { query: "mutation { userLogin(email: \"#{user.email}\", password: \"wrong password\") { user { email name signInCount } } }" }
+        ]
+      }
+    end
+
+    it 'executes multiple queries in the same request' do
+      post '/api/v1/graphql_auth', request_params
+
+      expect(json_response).to match(
+        [
+          { data: { userLogin: { user: { email: user.email, name: user.name, signInCount: 1 } } } },
+          {
+            data:   { userLogin: nil },
+            errors: [
+              hash_including(
+                message: 'Invalid login credentials. Please try again.', extensions: { code: 'USER_ERROR' }
+              )
+            ]
+          }
+        ]
+      )
+    end
+  end
+end
diff --git a/spec/support/generators/file_helpers.rb b/spec/support/generators/file_helpers.rb
deleted file mode 100644
index 84a8f0be..00000000
--- a/spec/support/generators/file_helpers.rb
+++ /dev/null
@@ -1,12 +0,0 @@
-require 'fileutils'
-
-module Generators
-  module FileHelpers
-    def create_file_with_content(path, content)
-      FileUtils.mkdir(File.dirname(path))
-      File.open(path, 'w') do |f|
-        f.write(content)
-      end
-    end
-  end
-end