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# frozen_string_literal: true
RSpec.describe TTY::Prompt::Question::Modifier, "#letter_case" do
context "string" do
let(:string) { "text to modify" }
it "changes to uppercase" do
modified = described_class.letter_case(:up, string)
expect(modified).to eq("TEXT TO MODIFY")
end
it "changes to lower case" do
modified = described_class.letter_case(:down, string)
expect(modified).to eq("text to modify")
end
it "capitalizes text" do
modified = described_class.letter_case(:capitalize, string)
expect(modified).to eq("Text to modify")
end
end
context "nil (empty user input)" do
let(:string) { nil }
example "up returns nil" do
modified = described_class.letter_case(:up, string)
expect(modified).to be_nil
end
example "down returns nil" do
modified = described_class.letter_case(:down, string)
expect(modified).to be_nil
end
example "capitalize returns nil" do
modified = described_class.letter_case(:capitalize, string)
expect(modified).to be_nil
end
end
end
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