ruby--ruby/spec/ruby/core/warning/warn_spec.rb

require_relative '../../spec_helper'

describe "Warning.warn" do
  it "complains" do
    -> {
      Warning.warn("Chunky bacon!")
    }.should complain("Chunky bacon!")
  end

  it "does not add a newline" do
    ruby_exe("Warning.warn('test')", args: "2>&1").should == "test"
  end

  it "returns nil" do
    ruby_exe("p Warning.warn('test')", args: "2>&1").should == "testnil\n"
  end

  it "extends itself" do
    Warning.singleton_class.ancestors.should include(Warning)
  end

  it "has Warning as the method owner" do
    ruby_exe("p Warning.method(:warn).owner").should == "Warning\n"
  end

  it "can be overridden" do
    code = <<-RUBY
      $stdout.sync = true
      $stderr.sync = true
      def Warning.warn(msg)
        if msg.start_with?("A")
          puts msg.upcase
        else
          super
        end
      end
      Warning.warn("A warning!")
      Warning.warn("warning from stderr\n")
    RUBY
    ruby_exe(code, args: "2>&1").should == %Q[A WARNING!\nwarning from stderr\n]
  end

  it "is called by parser warnings" do
    Warning.should_receive(:warn)
    verbose = $VERBOSE
    $VERBOSE = false
    begin
      eval "{ key: :value, key: :value2 }"
    ensure
      $VERBOSE = verbose
    end
  end

  ruby_version_is "2.5" do
    it "is called by Kernel.warn" do
      Warning.should_receive(:warn).with("Chunky bacon!\n")
      verbose = $VERBOSE
      $VERBOSE = false
      begin
        Kernel.warn("Chunky bacon!")
      ensure
        $VERBOSE = verbose
      end
    end
  end
end