Implement CLI debug option

spec/producer/core/cli_spec.rb

@@ -112,6 +112,15 @@ module Producer::Core
         end
       end
 
+      context 'with debug option' do
+        let(:options) { %w[-d] }
+
+        it 'assigns the given target to the env' do
+          cli.parse_arguments!
+          expect(cli.env).to be_debug
+        end
+      end
+
       context 'with combined options' do
         let(:options) { %w[-vn]}
 

spec/producer/core/env_spec.rb

@@ -26,6 +26,10 @@ module Producer::Core
         expect(env.verbose).to be false
       end
 
+      it 'assigns debug as false' do
+        expect(env.debug).to be false
+      end
+
       it 'assigns dry run as false' do
         expect(env.dry_run).to be false
       end
@@ -168,6 +172,13 @@ module Producer::Core
       end
     end
 
+    describe '#debug?' do
+      it 'returns true when debug is enabled' do
+        env.debug = true
+        expect(env).to be_debug
+      end
+    end
+
     describe '#dry_run?' do
       it 'returns true when dry run is enabled' do
         env.dry_run = true

spec/producer/core/error_formatter_spec.rb

@@ -23,14 +23,15 @@ module Producer
       end
 
       describe '#format' do
-        let(:message)   { 'some exception' }
-        let(:exception) { Exception.new(message) }
-
-        before { exception.set_backtrace %w[back trace] }
+        def exception
+          begin fail 'original exception' rescue fail 'some exception' end
+        rescue
+          $!.tap { |o| o.set_backtrace %w[back trace] }
+        end
 
         it 'formats the message' do
           expect(formatter.format exception)
-            .to match /^Exception: some exception$/
+            .to match /^RuntimeError: some exception$/
         end
 
         it 'indents the backtrace' do
@@ -43,6 +44,14 @@ module Producer
           it 'excludes producer code from the backtrace' do
             expect(formatter.format exception).not_to include 'producer-core'
           end
+
+          context 'when debug is enabled' do
+            let(:debug) { true }
+
+            it 'does not exclude producer code from the backtrace' do
+              expect(formatter.format exception).to include 'producer-core'
+            end
+          end
         end
       end
     end