shard-ameba/spec/ameba/rule/style/variable_names_spec.cr

require "../../../spec_helper"

module Ameba
  subject = Rule::Style::VariableNames.new

  private def it_reports_var_name(name, value, expected, *, file = __FILE__, line = __LINE__)
    it "reports variable name #{expected}", file, line do
      rule = Rule::Style::VariableNames.new
      expect_issue rule, <<-CRYSTAL, name: name, file: file, line: line
          %{name} = #{value}
        # ^{name} error: Var name should be underscore-cased: #{expected}, not %{name}
        CRYSTAL
    end
  end

  describe Rule::Style::VariableNames do
    it "passes if var names are underscore-cased" do
      expect_no_issues subject, <<-CRYSTAL
        class Greeting
          @@default_greeting = "Hello world"

          def initialize(@custom_greeting = nil)
          end

          def print_greeting
            greeting = @custom_greeting || @@default_greeting
            puts greeting
          end
        end
        CRYSTAL
    end

    it_reports_var_name "myBadNamedVar", "1", "my_bad_named_var"
    it_reports_var_name "wrong_Name", "'y'", "wrong_name"

    it "reports instance variable name" do
      expect_issue subject, <<-CRYSTAL
        class Greeting
          def initialize(@badNamed = nil)
                       # ^ error: Var name should be underscore-cased: @bad_named, not @badNamed
          end
        end
        CRYSTAL
    end

    it "reports method with multiple instance variables" do
      expect_issue subject, <<-CRYSTAL
        class Location
          def at(@startLocation = nil, @endLocation = nil)
               # ^ error: Var name should be underscore-cased: @start_location, not @startLocation
                                     # ^ error: Var name should be underscore-cased: @end_location, not @endLocation
          end
        end
        CRYSTAL
    end

    it "reports class variable name" do
      expect_issue subject, <<-CRYSTAL
        class Greeting
          @@defaultGreeting = "Hello world"
        # ^^^^^^^^^^^^^^^^^ error: Var name should be underscore-cased: @@default_greeting, not @@defaultGreeting
        end
        CRYSTAL
    end
  end
end