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Project: RSpec Core 2.0

Publisher: RSpec

explicit subject

You can override the implicit subject using the subject() method.

Scenarios
  1. subject in top level group
  2. subject in a nested group
  3. access subject from before block
  4. subject using helper method
subject in top level group
Given
a file named "top_level_subject_spec.rb" with: 
require 'rspec/expectations'

describe Array, "with some elements" do
  subject { [1,2,3] }
  it "should have the prescribed elements" do
    subject.should == [1,2,3]
  end
end
When
I run "rspec ./top_level_subject_spec.rb"
Then
the output should contain "1 example, 0 failures"
subject in a nested group
Given
a file named "nested_subject_spec.rb" with: 
require 'rspec/expectations'

describe Array do
  subject { [1,2,3] }
  describe "with some elements" do
    it "should have the prescribed elements" do
      subject.should == [1,2,3]
    end
  end
end
When
I run "rspec ./nested_subject_spec.rb"
Then
the output should contain "1 example, 0 failures"
access subject from before block
Given
a file named "top_level_subject_spec.rb" with: 
describe Array, "with some elements" do
  subject { [] }
  before { subject.push(1,2,3) }
  it "should have the prescribed elements" do
    subject.should == [1,2,3]
  end
end
When
I run "rspec ./top_level_subject_spec.rb"
Then
the output should contain "1 example, 0 failures"
subject using helper method
Given
a file named "helper_subject_spec.rb" with: 
require 'rspec/expectations'

describe Array do
  def prepared_array; [1,2,3] end
  subject { prepared_array }
  describe "with some elements" do
    it "should have the prescribed elements" do
      subject.should == [1,2,3]
    end
  end
end
When
I run "rspec ./helper_subject_spec.rb"
Then
the output should contain "1 example, 0 failures"

Last published over 5 years ago by dchelimsky.