ruby--ruby/spec/ruby/core/env/slice_spec.rb

require_relative '../../spec_helper'

ruby_version_is "2.6" do
  describe "ENV.slice" do
    before :each do
      @saved_foo = ENV["foo"]
      @saved_bar = ENV["bar"]
      ENV["foo"] = "0"
      ENV["bar"] = "1"
    end

    after :each do
      ENV["foo"] = @saved_foo
      ENV["bar"] = @saved_bar
    end

    it "returns a hash of the given environment variable names and their values" do
      ENV.slice("foo", "bar").should == {"foo" => "0", "bar" => "1"}
    end

    it "ignores each String that is not an environment variable name" do
      ENV.slice("foo", "boo", "bar").should == {"foo" => "0", "bar" => "1"}
    end

    it "raises TypeError if any argument is not a String and does not respond to #to_str" do
      -> { ENV.slice(Object.new) }.should raise_error(TypeError, "no implicit conversion of Object into String")
    end
  end
end