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Project: RSpec Expectations 2.11

Publisher: RSpec

Syntax Configuration

In addition to the long-supported should syntax, rspec-expectations
supports an alternate expect syntax. If you want your project to
only use one syntax, you can configure the available syntaxes.

Background
Given
a file named "syntaxes_spec.rb" with: 
describe "using the should syntax" do
  specify { 3.should eq(3) }
  specify { 3.should_not eq(4) }
  specify { lambda { raise "boom" }.should raise_error("boom") }
  specify { lambda { }.should_not raise_error }
end

describe "using the expect syntax" do
  specify { expect(3).to eq(3) }
  specify { expect(3).not_to eq(4) }
  specify { expect { raise "boom" }.to raise_error("boom") }
  specify { expect { }.not_to raise_error }
end
Scenarios
  1. Both syntaxes are available by default
  2. Disable should syntax
  3. Disable expect syntax
  4. Explicitly enable both syntaxes
Both syntaxes are available by default
When
I run rspec syntaxes_spec.rb
Then
the examples should all pass
Disable should syntax
Given
a file named "disable_should_syntax.rb" with: 
RSpec.configure do |config|
  config.expect_with :rspec do |c|
    c.syntax = :expect
  end
end
When
I run rspec disable_should_syntax.rb syntaxes_spec.rb
Then
the output should contain all of these:
8 examples, 4 failures
undefined method `should'
Disable expect syntax
Given
a file named "disable_expect_syntax.rb" with: 
RSpec.configure do |config|
  config.expect_with :rspec do |c|
    c.syntax = :should
  end
end
When
I run rspec disable_expect_syntax.rb syntaxes_spec.rb
Then
the output should contain all of these:
8 examples, 4 failures
undefined method `expect'
Explicitly enable both syntaxes
Given
a file named "enable_both_syntaxes.rb" with: 
RSpec.configure do |config|
  config.expect_with :rspec do |c|
    c.syntax = [:should, :expect]
  end
end
When
I run rspec enable_both_syntaxes.rb syntaxes_spec.rb
Then
the examples should all pass

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