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Project: RSpec Core 2.2

Publisher: RSpec

example name option

Use the --example (or -e) option to filter the examples to be run by name.

The argument is compiled to a Ruby Regexp, and matched against the full
description of the example, which is the concatenation of descriptions of the
group (including any nested groups) and the example.

This allows you to run a single uniquely named example, all examples with
similar names, all the example in a uniquely named group, etc, etc.

Background
Given
a file named "first_spec.rb" with: 
describe "first group" do
  it "first example in first group" do; end
  it "second example in first group" do; end
end
And
a file named "second_spec.rb" with: 
describe "second group" do
  it "first example in second group" do; end
  it "second example in second group" do; end
end
And
a file named "third_spec.rb" with: 
describe "third group" do
  it "first example in third group" do; end
  context "nested group" do
    it "first example in nested group" do; end
    it "second example in nested group" do; end
  end
end
And
a file named "fourth_spec.rb" with: 
describe Array do
  describe "#length" do
    it "is the number of items" do
      Array.new([1,2,3]).length.should eq 3
    end
  end
end
Scenarios
  1. no matches
  2. match on one word
  3. one match in each context
  4. one match in one file using just the example name
  5. one match in one file using the example name and the group name
  6. one match in one file using regexp
  7. all examples in one group
  8. one match in one file with group name
  9. all examples in one group including examples in nested groups
  10. Object#method
no matches
When
I run "rspec . --example nothing_like_this"
Then
the output should contain "0 examples, 0 failures"
match on one word
When
I run "rspec . --example example"
Then
the output should contain "7 examples, 0 failures"
one match in each context
When
I run "rspec . --example 'first example'"
Then
the output should contain "4 examples, 0 failures"
one match in one file using just the example name
When
I run "rspec . --example 'first example in first group'"
Then
the output should contain "1 example, 0 failures"
one match in one file using the example name and the group name
When
I run "rspec . --example 'first group first example in first group'"
Then
the output should contain "1 example, 0 failures"
one match in one file using regexp
When
I run "rspec . --example 'first .* first example'"
Then
the output should contain "1 example, 0 failures"
all examples in one group
When
I run "rspec . --example 'first group'"
Then
the output should contain "2 examples, 0 failures"
one match in one file with group name
When
I run "rspec . --example 'second group first example'"
Then
the output should contain "1 example, 0 failures"
all examples in one group including examples in nested groups
When
I run "rspec . --example 'third group'"
Then
the output should contain "3 examples, 0 failures"
Object#method
When
I run "rspec . --example 'Array#length'"
Then
the output should contain "1 example, 0 failures"

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