2 files changed, 101 insertions, 17 deletions

diff --git a/spec/lib/gitlab/slash_commands/command_definition_spec.rb b/spec/lib/gitlab/slash_commands/command_definition_spec.rb
index c9c2f314e57..5b9173d3d3f 100644
--- a/spec/lib/gitlab/slash_commands/command_definition_spec.rb
+++ b/spec/lib/gitlab/slash_commands/command_definition_spec.rb
@@ -167,6 +167,58 @@ describe Gitlab::SlashCommands::CommandDefinition do
             end
           end
         end
+
+        context 'when the command defines parse_params block' do
+          before do
+            subject.parse_params_block = ->(raw) { raw.strip }
+            subject.action_block = ->(parsed) { self.received_arg = parsed }
+          end
+
+          it 'executes the command passing the parsed param' do
+            subject.execute(context, {}, 'something   ')
+
+            expect(context.received_arg).to eq('something')
+          end
+        end
+      end
+    end
+  end
+
+  describe '#explain' do
+    context 'when the command is not available' do
+      before do
+        subject.condition_block = proc { false }
+        subject.explanation = 'Explanation'
+      end
+
+      it 'returns nil' do
+        result = subject.explain({}, {}, nil)
+
+        expect(result).to be_nil
+      end
+    end
+
+    context 'when the explanation is a static string' do
+      before do
+        subject.explanation = 'Explanation'
+      end
+
+      it 'returns this static string' do
+        result = subject.explain({}, {}, nil)
+
+        expect(result).to eq 'Explanation'
+      end
+    end
+
+    context 'when the explanation is dynamic' do
+      before do
+        subject.explanation = proc { |arg| "Dynamic #{arg}" }
+      end
+
+      it 'invokes the proc' do
+        result = subject.explain({}, {}, 'explanation')
+
+        expect(result).to eq 'Dynamic explanation'
       end
     end
   end
diff --git a/spec/lib/gitlab/slash_commands/dsl_spec.rb b/spec/lib/gitlab/slash_commands/dsl_spec.rb
index 2763d950716..33b49a5ddf9 100644
--- a/spec/lib/gitlab/slash_commands/dsl_spec.rb
+++ b/spec/lib/gitlab/slash_commands/dsl_spec.rb
@@ -11,67 +11,99 @@ describe Gitlab::SlashCommands::Dsl do
       end
 
       params 'The first argument'
-      command :one_arg, :once, :first do |arg1|
-        arg1
+      explanation 'Static explanation'
+      command :explanation_with_aliases, :once, :first do |arg|
+        arg
       end
 
       desc do
         "A dynamic description for #{noteable.upcase}"
       end
       params 'The first argument', 'The second argument'
-      command :two_args do |arg1, arg2|
-        [arg1, arg2]
+      command :dynamic_description do |args|
+        args.split
       end
 
       command :cc
 
+      explanation do |arg|
+        "Action does something with #{arg}"
+      end
       condition do
         project == 'foo'
       end
       command :cond_action do |arg|
         arg
       end
+
+      parse_params do |raw_arg|
+        raw_arg.strip
+      end
+      command :with_params_parsing do |parsed|
+        parsed
+      end
     end
   end
 
   describe '.command_definitions' do
     it 'returns an array with commands definitions' do
-      no_args_def, one_arg_def, two_args_def, cc_def, cond_action_def = DummyClass.command_definitions
+      no_args_def, explanation_with_aliases_def, dynamic_description_def,
+      cc_def, cond_action_def, with_params_parsing_def =
+        DummyClass.command_definitions
 
       expect(no_args_def.name).to eq(:no_args)
       expect(no_args_def.aliases).to eq([:none])
       expect(no_args_def.description).to eq('A command with no args')
+      expect(no_args_def.explanation).to eq('')
       expect(no_args_def.params).to eq([])
       expect(no_args_def.condition_block).to be_nil
       expect(no_args_def.action_block).to be_a_kind_of(Proc)
+      expect(no_args_def.parse_params_block).to be_nil
 
-      expect(one_arg_def.name).to eq(:one_arg)
-      expect(one_arg_def.aliases).to eq([:once, :first])
-      expect(one_arg_def.description).to eq('')
-      expect(one_arg_def.params).to eq(['The first argument'])
-      expect(one_arg_def.condition_block).to be_nil
-      expect(one_arg_def.action_block).to be_a_kind_of(Proc)
+      expect(explanation_with_aliases_def.name).to eq(:explanation_with_aliases)
+      expect(explanation_with_aliases_def.aliases).to eq([:once, :first])
+      expect(explanation_with_aliases_def.description).to eq('')
+      expect(explanation_with_aliases_def.explanation).to eq('Static explanation')
+      expect(explanation_with_aliases_def.params).to eq(['The first argument'])
+      expect(explanation_with_aliases_def.condition_block).to be_nil
+      expect(explanation_with_aliases_def.action_block).to be_a_kind_of(Proc)
+      expect(explanation_with_aliases_def.parse_params_block).to be_nil
 
-      expect(two_args_def.name).to eq(:two_args)
-      expect(two_args_def.aliases).to eq([])
-      expect(two_args_def.to_h(noteable: "issue")[:description]).to eq('A dynamic description for ISSUE')
-      expect(two_args_def.params).to eq(['The first argument', 'The second argument'])
-      expect(two_args_def.condition_block).to be_nil
-      expect(two_args_def.action_block).to be_a_kind_of(Proc)
+      expect(dynamic_description_def.name).to eq(:dynamic_description)
+      expect(dynamic_description_def.aliases).to eq([])
+      expect(dynamic_description_def.to_h(noteable: 'issue')[:description]).to eq('A dynamic description for ISSUE')
+      expect(dynamic_description_def.explanation).to eq('')
+      expect(dynamic_description_def.params).to eq(['The first argument', 'The second argument'])
+      expect(dynamic_description_def.condition_block).to be_nil
+      expect(dynamic_description_def.action_block).to be_a_kind_of(Proc)
+      expect(dynamic_description_def.parse_params_block).to be_nil
 
       expect(cc_def.name).to eq(:cc)
       expect(cc_def.aliases).to eq([])
       expect(cc_def.description).to eq('')
+      expect(cc_def.explanation).to eq('')
       expect(cc_def.params).to eq([])
       expect(cc_def.condition_block).to be_nil
       expect(cc_def.action_block).to be_nil
+      expect(cc_def.parse_params_block).to be_nil
 
       expect(cond_action_def.name).to eq(:cond_action)
       expect(cond_action_def.aliases).to eq([])
       expect(cond_action_def.description).to eq('')
+      expect(cond_action_def.explanation).to be_a_kind_of(Proc)
       expect(cond_action_def.params).to eq([])
       expect(cond_action_def.condition_block).to be_a_kind_of(Proc)
       expect(cond_action_def.action_block).to be_a_kind_of(Proc)
+      expect(cond_action_def.parse_params_block).to be_nil
+
+      expect(with_params_parsing_def.name).to eq(:with_params_parsing)
+      expect(with_params_parsing_def.aliases).to eq([])
+      expect(with_params_parsing_def.description).to eq('')
+      expect(with_params_parsing_def.explanation).to eq('')
+      expect(with_params_parsing_def.params).to eq([])
+      expect(with_params_parsing_def.condition_block).to be_nil
+      expect(with_params_parsing_def.action_block).to be_a_kind_of(Proc)
+      expect(with_params_parsing_def.parse_params_block).to be_a_kind_of(Proc)
     end
   end
 end