Standardize error message casing to lowercase.

CHANGELOG.md

@@ -7,6 +7,7 @@
 * [#2248](https://github.com/ruby-grape/grape/pull/2248): Upgraded to rspec 3.11.0 - [@dblock](https://github.com/dblock).
 * [#2249](https://github.com/ruby-grape/grape/pull/2249): Split CI matrix, extract edge - [@dblock](https://github.com/dblock).
 * [#2249](https://github.com/ruby-grape/grape/pull/2251): Upgraded to RuboCop 1.25.1 - [@dblock](https://github.com/dblock).
+* [#2267](https://github.com/ruby-grape/grape/pull/2267): Standardized English error messages - [@dblock](https://github.com/dblock).
 * Your contribution here.
 
 #### Fixes

lib/grape/locale/en.yml

@@ -11,8 +11,8 @@ en:
         except_values: 'has a value not allowed'
         same_as: 'is not the same as %{parameter}'
         missing_vendor_option:
-          problem: 'missing :vendor option.'
-          summary: 'when version using header, you must specify :vendor option. '
+          problem: 'missing :vendor option'
+          summary: 'when version using header, you must specify :vendor option'
           resolution: "eg: version 'v1', using: :header, vendor: 'twitter'"
         missing_mime_type:
           problem: 'missing mime type for %{new_format}'
@@ -21,12 +21,12 @@ en:
             or add your own with content_type :%{new_format}, 'application/%{new_format}'
             "
         invalid_with_option_for_represent:
-          problem: 'You must specify an entity class in the :with option.'
+          problem: 'you must specify an entity class in the :with option'
           resolution: 'eg: represent User, :with => Entity::User'
-        missing_option: 'You must specify :%{option} options.'
+        missing_option: 'you must specify :%{option} options'
         invalid_formatter: 'cannot convert %{klass} to %{to_format}'
         invalid_versioner_option:
-          problem: 'Unknown :using for versioner: %{strategy}'
+          problem: 'unknown :using for versioner: %{strategy}'
           resolution: 'available strategy for :using is :path, :header, :accept_version_header, :param'
         unknown_validator: 'unknown validator: %{validator_type}'
         unknown_options: 'unknown options: %{options}'
@@ -44,12 +44,12 @@ en:
             "when specifying %{body_format} as content-type, you must pass valid
             %{body_format} in the request's 'body'
             "
-        empty_message_body: 'Empty message body supplied with %{body_format} content-type'
-        too_many_multipart_files: "The number of uploaded files exceeded the system's configured limit (%{limit})"
+        empty_message_body: 'empty message body supplied with %{body_format} content-type'
+        too_many_multipart_files: "the number of uploaded files exceeded the system's configured limit (%{limit})"
         invalid_accept_header:
-          problem: 'Invalid accept header'
+          problem: 'invalid accept header'
           resolution: '%{message}'
         invalid_version_header:
-          problem: 'Invalid version header'
+          problem: 'invalid version header'
           resolution: '%{message}'
         invalid_response: 'Invalid response'

spec/grape/endpoint_spec.rb

@@ -432,7 +432,7 @@ def app
         end
         post '/upload', { file: '' }, 'CONTENT_TYPE' => 'multipart/form-data; boundary=foobar'
         expect(last_response.status).to eq(400)
-        expect(last_response.body).to eq('Empty message body supplied with multipart/form-data; boundary=foobar content-type')
+        expect(last_response.body).to eq('empty message body supplied with multipart/form-data; boundary=foobar content-type')
       end
     end
 
@@ -453,7 +453,7 @@ def app
         end
         post '/upload', { file: Rack::Test::UploadedFile.new(__FILE__, 'text/plain'), extra: Rack::Test::UploadedFile.new(__FILE__, 'text/plain') }
         expect(last_response.status).to eq(413)
-        expect(last_response.body).to eq("The number of uploaded files exceeded the system's configured limit (1)")
+        expect(last_response.body).to eq("the number of uploaded files exceeded the system's configured limit (1)")
       end
     end
 

spec/grape/exceptions/invalid_versioner_option_spec.rb

@@ -8,7 +8,7 @@
 
     it 'contains the problem in the message' do
       expect(error.message).to include(
-        'Unknown :using for versioner: headers'
+        'unknown :using for versioner: headers'
       )
     end
   end

spec/grape/exceptions/missing_option_spec.rb

@@ -8,7 +8,7 @@
 
     it 'contains the problem in the message' do
       expect(error.message).to include(
-        'You must specify :path options.'
+        'you must specify :path options'
       )
     end
   end