step matches command

command_parser.go

@@ -24,8 +24,19 @@ func (parser *wire_command_parser) parse(command []byte) wire_command {
 	case "end_scenario":
 		return &wire_command_end_scenario{}
 	case "step_matches":
-		return &wire_command_step_matches{}
+		return parse_step_matches(raw_command[1])
 	}
 
 	return nil
 }
+
+func parse_step_matches(raw_arguments json.RawMessage) wire_command {
+	type name_to_match struct {
+		Pattern string `json:"name_to_match"`
+	}
+
+	var arguments name_to_match
+	json.Unmarshal(raw_arguments, &arguments)
+
+	return &wire_command_step_matches{arguments.Pattern}
+}

command_parser_test.go

@@ -37,3 +37,14 @@ func Test_parsing_step_matches_returns_a_corresponding_command_object(t *testing
 	expected := &wire_command_step_matches{}
 	assert.IsType(t, expected, command)
 }
+
+func Test_step_name_to_match_is_stored_step_matches_command(t *testing.T) {
+	testee := wire_command_parser{}
+
+	pattern := "given pattern"
+	command_string := []byte(`["step_matches",{"name_to_match":"` + pattern + `"}]`)
+
+	command := testee.parse(command_string).(*wire_command_step_matches)
+
+	assert.Equal(t, pattern, command.name_to_match)
+}

wire_command.go

@@ -20,6 +20,7 @@ func (command *wire_command_end_scenario) execute(steps steps) wire_response {
 }
 
 type wire_command_step_matches struct {
+	name_to_match string
 }
 
 func (command *wire_command_step_matches) execute(steps steps) wire_response {