add fixtures samples and test cases

spec/features/file_spec.rb

+require "rails_helper"
+
+RSpec.describe "file" do
+    describe 'Fixture file test case' do
+        it "reads sample file" do
+            fileData = file_fixture("example.txt").read;
+            # print fileData   # print file Data 
+            expect(fileData).to eq("Hello")
+        end
+
+        it "read sample image size" do
+            fileSize = file_fixture("vv.jpg").size;
+            # print fileSize # print file size
+            expect(fileSize).to eq(6457)
+        end
+    end
+end
\ No newline at end of file

spec/fixtures/files/example.txt

+Hello
\ No newline at end of file

spec/rails_helper.rb

@@ -35,6 +35,7 @@ end
 RSpec.configure do |config|
   # Remove this line if you're not using ActiveRecord or ActiveRecord fixtures
   config.fixture_path = "#{::Rails.root}/spec/fixtures"
+  config.file_fixture_path = "spec/fixtures/files"
 
   # If you're not using ActiveRecord, or you'd prefer not to run each of your
   # examples within a transaction, remove the following line or assign false