Test case for a question asked in the SO ruby chat room

remove_some_colons_spec.rb

describe "#remove_some_colons" do

  it "should preserve an empty string" do
    expect(remove_some_colons("")).to eq ""
  end

  it "should remove a lone colon" do
    expect(remove_some_colons(":")).to eq ""
  end

  it "should remove a colon at BOS with a number after it" do
    expect(remove_some_colons(":123")).to eq "123"
  end

  it "should remove a colon with a number after it" do
    expect(remove_some_colons("abc:123")).to eq "abc123"
  end

  it "should remove a colon at EOS with a number before it" do
    expect(remove_some_colons("123:")).to eq "123"
  end

  it "should remove a colon with a number before it" do
    expect(remove_some_colons("123:abc")).to eq "123abc"
  end

  it "should preserve a colon that is between two numbers" do
    expect(remove_some_colons("123:456")).to eq "123:456"
  end
   
end

http://chat.stackoverflow.com/transcript/message/17785269#17785269