test: fix expectation

Author: bf4

features/open_api.feature

@@ -290,7 +290,7 @@ Feature: Generate Open API Specification from test examples
     And   the exit status should be 0
 
   Scenario: Index file should look like we expect
-    Then the file "doc/api/open_api.json" should contain exactly:
+    Then the file "doc/api/open_api.json" should contain JSON exactly like:
     """
 {
   "swagger": "2.0",

features/step_definitions/json_steps.rb

@@ -1,3 +1,5 @@
 Then /^the file "(.*?)" should contain JSON exactly like:$/ do |file, exact_content|
-  expect(JSON.parse(read(file).join)).to eq(JSON.parse(exact_content))
+  actual = JSON.dump(JSON.parse(read(file).join))
+  expected = JSON.dump(JSON.parse(exact_content))
+  expect(actual).to eq(expected)
 end