Enable logging non-string - fix #1410

CHANGELOG.md

@@ -18,7 +18,7 @@ Please visit [cucumber/CONTRIBUTING.md](https://github.com/cucumber/cucumber/blo
 
 ### Changed
 
-* N/A
+* `log` method can now be called with non-string objects and will run `.to_s` on them. [#1410](https://github.com/cucumber/cucumber-ruby/issues/1410)
 
 ### Removed
 

lib/cucumber/errors.rb

@@ -49,7 +49,4 @@ def initialize(messages)
       super(messages.join("\n"))
     end
   end
-
-  class LogTypeInvalid < StandardError
-  end
 end

lib/cucumber/glue/proto_world.rb

@@ -107,9 +107,8 @@ def embed(file, mime_type, _label = 'Screenshot')
         attach(file, mime_type)
       end
 
-      def log(message)
-        raise Cucumber::LogTypeInvalid unless message.is_a?(String)
-        attach(message.dup, 'text/x.cucumber.log+plain')
+      def log(*messages)
+        messages.each { |message| attach(message.to_s.dup, 'text/x.cucumber.log+plain') }
       end
 
       def attach(file, media_type)

spec/cucumber/glue/proto_world_spec.rb

@@ -58,6 +58,49 @@ module Glue
           end
         end
 
+        describe 'when logging an object' do
+          define_feature <<-FEATURE
+        Feature: Banana party
+
+          Scenario: Monkey eats banana
+            When an object is logged
+          FEATURE
+
+          define_steps do
+            When('an object is logged') do
+              log(a: 1, b: 2, c: 3)
+            end
+          end
+
+          it 'attached the styring version on the object' do
+            expect(@out.string).to include '{:a=>1, :b=>2, :c=>3}'
+          end
+        end
+
+        describe 'when logging multiple items on one call' do
+          define_feature <<-FEATURE
+        Feature: Banana party
+
+          Scenario: Monkey eats banana
+            When monkey eats banana
+          FEATURE
+
+          define_steps do
+            When('{word} {word} {word}') do |subject, verb, complement|
+              log "subject: #{subject}", "verb: #{verb}", "complement: #{complement}", subject: subject, verb: verb, complement: complement
+            end
+          end
+
+          it 'logs each parameter independently' do
+            expect(@out.string).to include [
+              '      subject: monkey',
+              '      verb: eats',
+              '      complement: banana',
+              '      {:subject=>"monkey", :verb=>"eats", :complement=>"banana"}'
+            ].join("\n")
+          end
+        end
+
         describe 'when modifying the printed variable after the call to log' do
           define_feature <<-FEATURE
         Feature: Banana party

spec/cucumber/glue/step_definition_spec.rb

@@ -191,11 +191,12 @@ def step_match(text)
           run_step 'Loud'
         end
 
-        it 'raises an exception if the message is not a String' do
+        it 'calls `to_s` if the message is not a String' do
+          expect(user_interface).to receive(:attach).with('["Not", 1, "string"]', 'text/x.cucumber.log+plain')
           dsl.Given(/Loud/) do
             log ['Not', 1, 'string']
           end
-          expect { run_step 'Loud' }.to raise_exception(Cucumber::LogTypeInvalid)
+          run_step 'Loud'
         end
       end