#! /usr/bin/env ruby -S rspec
require 'spec_helper'

describe "the delete function" do
  let(:scope) { PuppetlabsSpec::PuppetInternals.scope }

  it "should exist" do
    expect(Puppet::Parser::Functions.function("delete")).to eq("function_delete")
  end

  it "should raise a ParseError if there are fewer than 2 arguments" do
    expect { scope.function_delete([]) }.to( raise_error(Puppet::ParseError))
  end

  it "should raise a ParseError if there are greater than 2 arguments" do
    expect { scope.function_delete([[], 'foo', 'bar']) }.to( raise_error(Puppet::ParseError))
  end

  it "should raise a TypeError if a number is passed as the first argument" do
    expect { scope.function_delete([1, 'bar']) }.to( raise_error(TypeError))
  end

  it "should delete all instances of an element from an array" do
    result = scope.function_delete([['a','b','c','b'],'b'])
    expect(result).to(eq(['a','c']))
  end

  it "should delete all instances of a substring from a string" do
    result = scope.function_delete(['foobarbabarz','bar'])
    expect(result).to(eq('foobaz'))
  end

  it "should delete a key from a hash" do
    result = scope.function_delete([{ 'a' => 1, 'b' => 2, 'c' => 3 },'b'])
    expect(result).to(eq({ 'a' => 1, 'c' => 3 }))
  end

  it "should not change origin array passed as argument" do
    origin_array = ['a','b','c','d']
    result = scope.function_delete([origin_array, 'b'])
    expect(origin_array).to(eq(['a','b','c','d']))
  end

  it "should not change the origin string passed as argument" do
    origin_string = 'foobarbabarz'
    result = scope.function_delete([origin_string,'bar'])
    expect(origin_string).to(eq('foobarbabarz'))
  end

  it "should not change origin hash passed as argument" do
    origin_hash = { 'a' => 1, 'b' => 2, 'c' => 3 }
    result = scope.function_delete([origin_hash, 'b'])
    expect(origin_hash).to(eq({ 'a' => 1, 'b' => 2, 'c' => 3 }))
  end

end