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Feature: diffing

When appropriate, failure messages will automatically include a diff.

Scenario: 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
# ./example_spec.rb:13
"""

Scenario: 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
# ./example_spec.rb:9
"""

Scenario: 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:"

Scenario: 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:"
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