Module: Moarspec::ExampleGroups::InstantContext

Defined in:
lib/moarspec/example_groups/instant_context.rb

Overview

Provides a shorter way to define a context and its ‘let` values in one statement.

See also #it_with for a way to define just one example with its ‘let`s.

Examples:

subject { x + y }

instant_context 'with numeric values', lets: {x: 1, y: 2} do
  it { is_expected.to eq 3 }
end
# or, without an explicit description:
instant_context lets: {x: 1, y: 2} do
  it { is_expected.to eq 3 }
end

# is equivalent to

context 'with numeric values (x=1, y=2)' do
  let(:x) { 1 }
  let(:y) { 2 }

  it { is_expected.to eq 3 }
end

# without explicit description, it is equivalent to
context 'with x=1, y=2' do
  # ...
end

Instance Method Summary collapse

Instance Method Details

#instant_context(description = nil, lets:, **metadata, &block) ⇒ Object 



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# File 'lib/moarspec/example_groups/instant_context.rb', line 35

def instant_context(description = nil, lets:, **metadata, &block)
  full_description = "with #{lets.map { "#{_1}=#{_2.inspect}" }.join(', ')}"
  full_description = "#{description} (#{full_description})" if description
  absolute_path, line_number = caller_locations.first.then { [_1.absolute_path, _1.lineno] }

  context full_description, **metadata do
    # Tricking RSpec to think this context was defined where `instant_context` was called,
    # so `rspec that_spec.rb:123` knew it is related
    self.metadata.merge!(absolute_file_path: absolute_path, line_number: line_number)

    lets.each do |name, val|
      let(name) { val }
    end
    instance_eval(&block)
  end
end