Class: AssertJson::Json

Inherits:
Object
  • Object
show all
Defined in:
lib/assert_json/assert_json.rb

Instance Method Summary collapse

Constructor Details

#initialize(json_string) ⇒ Json

Returns a new instance of Json.



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# File 'lib/assert_json/assert_json.rb', line 30

def initialize(json_string)
  @decoded_json = ActiveSupport::JSON.decode(json_string)
  @expected_keys = []
  @only = false
end

Instance Method Details

#element(*args, &block) ⇒ Object Also known as: has 



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# File 'lib/assert_json/assert_json.rb', line 52

def element(*args, &block)
  arg = args.shift

  token = case @decoded_json
          when Array
            @decoded_json.shift
          else
            @decoded_json
          end

  case token
  when Hash
    arg = arg.to_s
    raise_error("element #{arg} not found") unless token.keys.include?(arg)
    unless args.empty?
      second_arg = args.shift
      gen_error = lambda {raise_error("element #{token[arg].inspect} does not match #{second_arg.inspect}")}
      case second_arg
      when Regexp
        gen_error.call if second_arg !~ token[arg].to_s
      when Symbol
        gen_error.call if second_arg.to_s != token[arg]
      else
        gen_error.call if second_arg != token[arg]
      end
    end
  when Array
    if !block_given? && token != arg
      raise_error("element #{arg} not found")
    end
  when String
    case arg
    when Regexp
      raise_error("element #{arg.inspect} not found") if token !~ arg
    else
      raise_error("element #{arg.inspect} not found") if token != arg.to_s
    end
  when NilClass
    raise_error("no element left")
  else
    flunk
  end

  @expected_keys.push arg

  if block_given?
    begin
      only_in_scope = @only
      expected_keys_in_scope = @expected_keys
      @expected_keys = []
      decoded_json_in_scope = @decoded_json
      @decoded_json = case token
                      when Hash
                        token[arg]
                      else
                        token
                      end
      yield
      test_for_unexpected_keys(arg)
    ensure
      @expected_keys = expected_keys_in_scope
      @only = only_in_scope
      @decoded_json = decoded_json_in_scope
    end
  end
end

#item(index, &block) ⇒ Object 



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# File 'lib/assert_json/assert_json.rb', line 36

def item(index, &block)
  only_in_scope = @only
  expected_keys_in_scope = @expected_keys
  @expected_keys = []
  decoded_json_in_scope = @decoded_json
  @decoded_json = @decoded_json[index]
  begin
    yield if block_given?
    test_for_unexpected_keys(index)
  ensure
    @decoded_json = decoded_json_in_scope
    @expected_keys = expected_keys_in_scope
    @only = only_in_scope
  end
end

#not_element(*args, &block) ⇒ Object Also known as: has_not 



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# File 'lib/assert_json/assert_json.rb', line 120

def not_element(*args, &block)
  arg = args.shift
  token = @decoded_json
  case token
  when Array
    raise_error("element #{arg} found, but not expected") if token.include?(arg.to_s)
  else
    raise_error("element #{arg} found, but not expected") if token.keys.include?(arg.to_s)
  end
end

#only ⇒ Object Also known as: has_only 



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# File 'lib/assert_json/assert_json.rb', line 132

def only
  @only = true
end

#test_for_unexpected_keys(name = 'root') ⇒ Object 



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# File 'lib/assert_json/assert_json.rb', line 137

def test_for_unexpected_keys(name = 'root')
  return unless @only

  if @decoded_json.is_a?(Hash)
    unexpected_keys = @decoded_json.keys - @expected_keys
    if unexpected_keys.count > 0
      raise_error("element #{name} has unexpected keys: #{unexpected_keys.join(', ')}")
    end
  end
end