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require "spec_helper"
require "pp"
RSpec.describe "Diffs printed when arguments don't match" do
before do
allow(RSpec::Mocks.configuration).to receive(:color?).and_return(false)
end
context "with a non matcher object" do
it "does not print a diff when single line arguments are mismatched" do
with_unfulfilled_double do |d|
expect(d).to receive(:foo).with("some string")
expect {
d.foo("this other string")
}.to fail_with(a_string_excluding("Diff:"))
end
end
it "does not print a diff when differ returns a string of only whitespace" do
differ = instance_double(RSpec::Support::Differ, :diff => " \n \t ")
allow(RSpec::Support::Differ).to receive_messages(:new => differ)
with_unfulfilled_double do |d|
expect(d).to receive(:foo).with("some string\nline2")
expect {
d.foo("this other string")
}.to fail_with(a_string_excluding("Diff:"))
end
end
it "prints a diff of the strings for individual mismatched multi-line string arguments" do
with_unfulfilled_double do |d|
expect(d).to receive(:foo).with("some string\nline2")
expect {
d.foo("this other string")
}.to fail_with("#<Double \"double\"> received :foo with unexpected arguments\n" \
" expected: (\"some string\\nline2\")\n got: (\"this other string\")\n" \
"Diff:\n@@ -1,3 +1,2 @@\n-some string\n-line2\n+this other string\n")
end
end
it "prints a diff of the args lists for multiple mismatched string arguments" do
with_unfulfilled_double do |d|
expect(d).to receive(:foo).with("some string\nline2", "some other string")
expect {
d.foo("this other string")
}.to fail_with("#<Double \"double\"> received :foo with unexpected arguments\n" \
" expected: (\"some string\\nline2\", \"some other string\")\n" \
" got: (\"this other string\")\nDiff:\n@@ -1,3 +1,2 @@\n-some string\\nline2\n-some other string\n+this other string\n")
end
end
it "does not print a diff when multiple single-line string arguments are mismatched" do
with_unfulfilled_double do |d|
expect(d).to receive(:foo).with("some string", "some other string")
expect {
d.foo("this other string", "a fourth string")
}.to fail_with(a_string_excluding("Diff:"))
end
end
let(:expected_hash) { {:foo => :bar, :baz => :quz} }
let(:actual_hash) { {:bad => :hash} }
it "prints a diff with hash args" do
with_unfulfilled_double do |d|
expect(d).to receive(:foo).with(expected_hash)
expect {
d.foo(:bad => :hash)
}.to fail_with(/\A#<Double "double"> received :foo with unexpected arguments\n expected: \(#{hash_regex_inspect expected_hash}\)\n got: \(#{hash_regex_inspect actual_hash}\)\nDiff:\n@@ \-1\,2 \+1\,2 @@\n\-\[#{hash_regex_inspect expected_hash}\]\n\+\[#{hash_regex_inspect actual_hash}\]\n\z/)
end
end
it "prints a diff with an expected hash arg and a non-hash actual arg" do
with_unfulfilled_double do |d|
expect(d).to receive(:foo).with(expected_hash)
expect {
d.foo(Object.new)
}.to fail_with(/-\[#{hash_regex_inspect expected_hash}\].*\+\[#<Object.*>\]/m)
end
end
if RUBY_VERSION.to_f < 1.9
# Ruby 1.8 hashes are not ordered, but `#inspect` on a particular unchanged
# hash instance should return consistent output. However, on Travis that does
# not always seem to be true and we have no idea why. Somehow, the travis build
# has occasionally failed due to the output ordering varying between `inspect`
# calls to the same hash. This regex allows us to work around that.
def hash_regex_inspect(hash)
"\\{(#{hash.map { |key, value| "#{key.inspect}=>#{value.inspect}.*" }.join "|"}){#{hash.size}}\\}"
end
else
def hash_regex_inspect(hash)
Regexp.escape(hash.inspect)
end
end
it "prints a diff with array args" do
with_unfulfilled_double do |d|
expect(d).to receive(:foo).with([:a, :b, :c])
expect {
d.foo([])
}.to fail_with("#<Double \"double\"> received :foo with unexpected arguments\n expected: ([:a, :b, :c])\n got: ([])\nDiff:\n@@ -1,2 +1,2 @@\n-[[:a, :b, :c]]\n+[[]]\n")
end
end
context "that defines #description" do
it "does not use the object's description for a non-matcher object that implements #description" do
with_unfulfilled_double do |d|
collab = double(:collab, :description => "This string")
collab_inspect = collab.inspect
expect(d).to receive(:foo).with(collab)
expect {
d.foo([])
}.to fail_with("#<Double \"double\"> received :foo with unexpected arguments\n" \
" expected: (#{collab_inspect})\n" \
" got: ([])\nDiff:\n@@ -1,2 +1,2 @@\n-[#{collab_inspect}]\n+[[]]\n")
end
end
end
end
context "with a matcher object" do
context "that defines #description" do
it "uses the object's description" do
with_unfulfilled_double do |d|
collab = fake_matcher(Object.new)
collab_description = collab.description
expect(d).to receive(:foo).with(collab)
expect {
d.foo([:a, :b])
}.to fail_with("#<Double \"double\"> received :foo with unexpected arguments\n" \
" expected: (#{collab_description})\n" \
" got: ([:a, :b])\nDiff:\n@@ -1,2 +1,2 @@\n-[\"#{collab_description}\"]\n+[[:a, :b]]\n")
end
end
end
context "that does not define #description" do
it "for a matcher object that does not implement #description" do
with_unfulfilled_double do |d|
collab = Class.new do
def self.name
"RSpec::Mocks::ArgumentMatchers::"
end
def inspect
"#<MyCollab>"
end
end.new
expect(RSpec::Support.is_a_matcher?(collab)).to be true
collab_inspect = collab.inspect
collab_pp = PP.pp(collab, "").strip
expect(d).to receive(:foo).with(collab)
expect {
d.foo([:a, :b])
}.to fail_with("#<Double \"double\"> received :foo with unexpected arguments\n" \
" expected: (#{collab_inspect})\n" \
" got: ([:a, :b])\nDiff:\n@@ -1,2 +1,2 @@\n-[#{collab_pp}]\n+[[:a, :b]]\n")
end
end
end
end
end
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