Make the result objects usable in the new formatter api

lib/cucumber/core/test/result.rb

@@ -44,6 +44,14 @@ def describe_to(visitor, *args)
           def to_s
             "✓"
           end
+
+          def with_appended_backtrace(step)
+            self
+          end
+
+          def with_filtered_backtrace(filter)
+            self
+          end
         end
 
         class Failed
@@ -72,6 +80,14 @@ def with_duration(new_duration)
             self.class.new(new_duration, exception)
           end
 
+          def with_appended_backtrace(step)
+            exception.backtrace << step.backtrace_line if step.respond_to?(:backtrace_line)
+            self
+          end
+
+          def with_filtered_backtrace(filter)
+            self.class.new(duration, filter.new(exception.dup).exception)
+          end
         end
 
         # Base class for exceptions that can be raised in a step defintion causing 
@@ -92,6 +108,18 @@ def with_message(new_message)
           def with_duration(new_duration)
             self.class.new(message, new_duration, backtrace)
           end
+
+          def with_appended_backtrace(step)
+            return self unless step.respond_to?(:backtrace_line)
+            set_backtrace([]) unless backtrace
+            backtrace << step.backtrace_line
+            self
+          end
+
+          def with_filtered_backtrace(filter)
+            return self unless backtrace
+            filter.new(dup).exception
+          end
         end
 
         class Undefined < Raisable

lib/cucumber/core/test/runner.rb

@@ -97,6 +97,8 @@ def initialize(step_result)
 
               def execute(test_step, monitor, &continue)
                 result = test_step.execute(monitor.result, &continue)
+                result = result.with_message(%(Undefined step: "#{test_step.name}")) if result.undefined?
+                result = result.with_appended_backtrace(test_step.source.last) if test_step.respond_to?(:source)
                 result.describe_to(monitor, result)
               end
 

spec/cucumber/core/test/result_spec.rb

@@ -30,6 +30,14 @@ module Cucumber::Core::Test
         expect { Result::Passed.new }.to raise_error(ArgumentError)
       end
 
+      it "does nothing when appending the backtrace" do
+        expect( result.with_appended_backtrace(double) ).to equal result
+      end
+
+      it "does nothing when filtering the backtrace" do
+        expect( result.with_filtered_backtrace(double) ).to equal result
+      end
+
       it { expect( result ).to     be_passed    }
       it { expect( result ).not_to be_failed    }
       it { expect( result ).not_to be_undefined }
@@ -58,6 +66,31 @@ module Cucumber::Core::Test
         expect { Result::Failed.new(duration) }.to raise_error(ArgumentError)
       end
 
+      it "does nothing if step has no backtrace line" do
+        result.exception.set_backtrace("exception backtrace")
+        step = "does not respond_to?(:backtrace_line)"
+
+        expect( result.with_appended_backtrace(step).exception.backtrace ).to eq(["exception backtrace"])
+      end
+
+      it "appends the backtrace line of the step" do
+        result.exception.set_backtrace("exception backtrace")
+        step = double
+        expect( step ).to receive(:backtrace_line).and_return("step_line")
+
+        expect( result.with_appended_backtrace(step).exception.backtrace ).to eq(["exception backtrace", "step_line"])
+      end
+
+      it "apply filters to the exception" do
+        filter_class = double
+        filter = double
+        filtered_exception = double
+        expect( filter_class ).to receive(:new).with(result.exception).and_return(filter)
+        expect( filter ).to receive(:exception).and_return(filtered_exception)
+
+        expect( result.with_filtered_backtrace(filter_class).exception ).to equal filtered_exception
+      end
+
       it { expect( result ).not_to be_passed    }
       it { expect( result ).to     be_failed    }
       it { expect( result ).not_to be_undefined }
@@ -80,6 +113,54 @@ module Cucumber::Core::Test
       it { expect( result ).not_to be_skipped   }
     end
 
+    describe Result::Raisable do
+      context "with or without backtrace" do
+        subject(:result) { Result::Raisable.new }
+
+        it "does nothing if step has no backtrace line" do
+          step = "does not respond_to?(:backtrace_line)"
+
+          expect( result.with_appended_backtrace(step).backtrace ).to eq(nil)
+        end
+      end
+
+      context "without backtrace" do
+        subject(:result) { Result::Raisable.new }
+
+        it "set the backtrace to the backtrace line of the step" do
+          step = double
+          expect( step ).to receive(:backtrace_line).and_return("step_line")
+
+          expect( result.with_appended_backtrace(step).backtrace ).to eq(["step_line"])
+        end
+
+        it "does nothing when filtering the backtrace" do
+          expect( result.with_filtered_backtrace(double) ).to equal result
+        end
+      end
+
+      context "with backtrace" do
+        subject(:result) { Result::Raisable.new("message", 0, "backtrace") }
+
+        it "appends the backtrace line of the step" do
+          step = double
+          expect( step ).to receive(:backtrace_line).and_return("step_line")
+
+          expect( result.with_appended_backtrace(step).backtrace ).to eq(["backtrace", "step_line"])
+        end
+
+        it "apply filters to the backtrace" do
+          filter_class = double
+          filter = double
+          filtered_result = double
+          expect( filter_class ).to receive(:new).with(result.exception).and_return(filter)
+          expect( filter ).to receive(:exception).and_return(filtered_result)
+
+          expect( result.with_filtered_backtrace(filter_class) ).to equal filtered_result
+        end
+      end
+    end
+
     describe Result::Undefined do
       subject(:result) { Result::Undefined.new }
 

spec/cucumber/core/test/runner_spec.rb

@@ -100,6 +100,24 @@ module Cucumber::Core::Test
             expect( report ).to receive(:after_test_case) do |test_case, result|
               expect( result ).to be_undefined
             end
+            allow( undefined.source.last ).to receive(:name)
+            test_case.describe_to runner
+          end
+
+          it 'sets the message on the result' do
+            expect( report ).to receive(:after_test_case) do |test_case, result|
+              expect( result.message ).to eq("Undefined step: \"step name\"")
+            end
+            expect( undefined.source.last ).to receive(:name).and_return("step name")
+            test_case.describe_to runner
+          end
+
+          it 'appends the backtrace of the result' do
+            expect( report ).to receive(:after_test_case) do |test_case, result|
+              expect( result.backtrace ).to eq(["step line"])
+            end
+            expect( undefined.source.last ).to receive(:backtrace_line).and_return("step line")
+            allow( undefined.source.last ).to receive(:name)
             test_case.describe_to runner
           end
         end
@@ -113,6 +131,14 @@ module Cucumber::Core::Test
             end
             test_case.describe_to runner
           end
+
+          it 'appends the backtrace of the result' do
+            expect( report ).to receive(:after_test_case) do |test_case, result|
+              expect( result.backtrace.last ).to eq("step line")
+            end
+            expect( pending.source.last ).to receive(:backtrace_line).and_return("step line")
+            test_case.describe_to runner
+          end
         end
 
         context "a skipping step" do
@@ -124,6 +150,14 @@ module Cucumber::Core::Test
             end
             test_case.describe_to runner
           end
+
+          it 'appends the backtrace of the result' do
+            expect( report ).to receive(:after_test_case) do |test_case, result|
+              expect( result.backtrace.last ).to eq("step line")
+            end
+            expect( skipping.source.last ).to receive(:backtrace_line).and_return("step line")
+            test_case.describe_to runner
+          end
         end
 
         context 'that fail' do
@@ -135,6 +169,14 @@ module Cucumber::Core::Test
             end
             test_case.describe_to runner
           end
+
+          it 'appends the backtrace of the exception of the result' do
+            expect( report ).to receive(:after_test_case) do |test_case, result|
+              expect( result.exception.backtrace.last ).to eq("step line")
+            end
+            expect( failing.source.last ).to receive(:backtrace_line).and_return("step line")
+            test_case.describe_to runner
+          end
         end
 
         context 'where the first step fails' do