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Project: RSpec Expectations 2.4

Publisher: RSpec

diffing

When appropriate, failure messages will automatically include a diff.

Scenarios
  1. diff for a multiline string
  2. diff for a multiline string and a regexp
  3. no diff for a single line strings
  4. no diff for numbers
diff for a multiline string
Given
a file named "example_spec.rb" with: 
describe "a multiline string" do
  it "is like another string" do
    expected = <<-EXPECTED
this is the
  expected
    string
EXPECTED
    actual = <<-ACTUAL
this is the
  actual
    string
ACTUAL
    actual.should eq(expected)
  end
end
When
I run "rspec example_spec.rb"
Then
the output should contain: 
       Diff:
       @@ -1,4 +1,4 @@
        this is the
       -  expected
       +  actual
            string
diff for a multiline string and a regexp
Given
a file named "example_spec.rb" with: 
describe "a multiline string" do
  it "is like another string" do
    expected = /expected/m
    actual = <<-ACTUAL
this is the
  actual
    string
ACTUAL
    actual.should =~ expected
  end
end
When
I run "rspec example_spec.rb"
Then
the output should contain: 
       Diff:
       @@ -1,2 +1,4 @@
       -/expected/m
       +this is the
       +  actual
       +    string
no diff for a single line strings
Given
a file named "example_spec.rb" with: 
describe "a single line string" do
  it "is like another string" do
    expected = "this string"
    actual   = "that string"
    actual.should eq(expected)
  end
end
When
I run "rspec example_spec.rb"
Then
the output should not contain "Diff:"
no diff for numbers
Given
a file named "example_spec.rb" with: 
describe "a number" do
  it "is like another number" do
    1.should eq(2)
  end
end
When
I run "rspec example_spec.rb"
Then
the output should not contain "Diff:"

Last published over 6 years ago by dchelimsky.