#Ruby の #Rspec ENV 環境変数を他のテストケースを汚さずにハッシュで上書きして特定のキーを削除する ( overwrite hash clean not dirty by stub constant and delete specific key )

# run
#
# FOO=bar rspec this-spec-file.rb

describe do
  # OK
  describe do
    it do
      expect(ENV.fetch("FOO")).to eq "bar"
    end
  end

  # OK
  # it does not make dirty ENV ( overwritten in another test cases )
  describe do
    # Actually ENV is not hash but mock by Hash
    before do
      stub_const "ENV", ENV.to_h.tap {|env| env.delete("FOO") }
    end

    it do
      expect(ENV["FOO"]).to eq nil
    end

    # KeyError: key not found: "FOO"
    it do
      expect { ENV.fetch("FOO") }.to raise_error(KeyError)
    end
  end

  # OK
  describe do
    it do
      expect(ENV.fetch("FOO")).to eq "bar"
    end
  end
end


# is expected to eq "bar"

# is expected to raise KeyError

# is expected to eq "bar"

# Finished in 0.00387 seconds (files took 0.12889 seconds to load)
# 3 examples, 0 failures

Original by Github issue

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