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More about adding a collaboratorAggregating Failures
RSpec::Expectations provides aggregate_failures, an API that allows you to group a set of expectations and see all the failures at once, rather than it aborting on the first failure. RSpec::Core improves on this feature in a couple of ways:
- RSpec::Core provides much better failure output, adding code snippets and backtraces to the sub-failures, just like it does for any normal failure.
- RSpec::Core provides metadata integration for this feature. Each example that is tagged with
:aggregate_failureswill be wrapped in anaggregate_failuresblock. You can also useconfig.define_derived_metadatato apply this to every example automatically.
The metadata form is quite convenient, but may not work well for end-to-end tests that have multiple distinct steps. For example, consider a spec for an HTTP client workflow that (1) makes a request, (2) expects a redirect, (3) follows the redirect, and (4) expects a particular response. You probably want the expect(response.status).to be_between(300, 399) expectation to immediately abort if it fails, because you can't perform the next step (following the redirect) if that is not satisfied. For these situations, we encourage you to use the aggregate_failures block form to wrap each set of expectations that represents a distinct step in the test workflow.
- Background
-
- Given
-
a file named "lib/client.rb" with:
Response = Struct.new(:status, :headers, :body) class Client def self.make_request(url='/') Response.new(404, { "Content-Type" => "text/plain" }, "Not Found") end end
- Scenarios
-
- Use `aggregate_failures` block form
- Use `aggregate_failures` block form
- Use `:aggregate_failures` metadata
- Enable failure aggregation globally using `define_derived_metadata`
- Enable failure aggregation globally using `define_derived_metadata`
- Nested failure aggregation works
- Nested failure aggregation works
- Mock expectation failures are aggregated as well
- Pending integrates properly with aggregated failures
- Pending integrates properly with aggregated failures
- Use `aggregate_failures` block form
-
- Given
-
a file named "spec/use_block_form_spec.rb" with:
require 'client' RSpec.describe Client do after do # this should be appended to failure list expect(false).to be(true), "after hook failure" end around do |ex| ex.run # this should also be appended to failure list expect(false).to be(true), "around hook failure" end it "returns a successful response" do response = Client.make_request aggregate_failures "testing response" do expect(response.status).to eq(200) expect(response.headers).to include("Content-Type" => "application/json") expect(response.body).to eq('{"message":"Success"}') end end end - When
-
I run
rspec spec/use_block_form_spec.rb - Then
-
it should fail and list all the failures:
Failures: 1) Client returns a successful response Got 3 failures: 1.1) Got 3 failures from failure aggregation block "testing response". # ./spec/use_block_form_spec.rb:18 # ./spec/use_block_form_spec.rb:10 1.1.1) Failure/Error: expect(response.status).to eq(200) expected: 200 got: 404 (compared using ==) # ./spec/use_block_form_spec.rb:19 1.1.2) Failure/Error: expect(response.headers).to include("Content-Type" => "application/json") expected {"Content-Type" => "text/plain"} to include {"Content-Type" => "application/json"} Diff: @@ -1 +1 @@ -"Content-Type" => "application/json", +"Content-Type" => "text/plain", # ./spec/use_block_form_spec.rb:20 1.1.3) Failure/Error: expect(response.body).to eq('{"message":"Success"}') expected: "{\"message\":\"Success\"}" got: "Not Found" (compared using ==) # ./spec/use_block_form_spec.rb:21 1.2) Failure/Error: expect(false).to be(true), "after hook failure" after hook failure # ./spec/use_block_form_spec.rb:6 # ./spec/use_block_form_spec.rb:10 1.3) Failure/Error: expect(false).to be(true), "around hook failure" around hook failure # ./spec/use_block_form_spec.rb:12
- Use `aggregate_failures` block form
-
- Given
-
a file named "spec/use_block_form_spec.rb" with:
require 'client' RSpec.describe Client do after do # this should be appended to failure list expect(false).to be(true), "after hook failure" end around do |ex| ex.run # this should also be appended to failure list expect(false).to be(true), "around hook failure" end it "returns a successful response" do response = Client.make_request aggregate_failures "testing response" do expect(response.status).to eq(200) expect(response.headers).to include("Content-Type" => "application/json") expect(response.body).to eq('{"message":"Success"}') end end end - When
-
I run
rspec spec/use_block_form_spec.rb - Then
-
it should fail and list all the failures:
Failures: 1) Client returns a successful response Got 3 failures: 1.1) Got 3 failures from failure aggregation block "testing response". # ./spec/use_block_form_spec.rb:18 # ./spec/use_block_form_spec.rb:10 1.1.1) Failure/Error: expect(response.status).to eq(200) expected: 200 got: 404 (compared using ==) # ./spec/use_block_form_spec.rb:19 1.1.2) Failure/Error: expect(response.headers).to include("Content-Type" => "application/json") expected {"Content-Type" => "text/plain"} to include {"Content-Type" => "application/json"} Diff: @@ -1,2 +1,2 @@ -"Content-Type" => "application/json", +"Content-Type" => "text/plain", # ./spec/use_block_form_spec.rb:20 1.1.3) Failure/Error: expect(response.body).to eq('{"message":"Success"}') expected: "{\"message\":\"Success\"}" got: "Not Found" (compared using ==) # ./spec/use_block_form_spec.rb:21 1.2) Failure/Error: expect(false).to be(true), "after hook failure" after hook failure # ./spec/use_block_form_spec.rb:6 # ./spec/use_block_form_spec.rb:10 1.3) Failure/Error: expect(false).to be(true), "around hook failure" around hook failure # ./spec/use_block_form_spec.rb:12
- Use `:aggregate_failures` metadata
-
- Given
-
a file named "spec/use_metadata_spec.rb" with:
require 'client' RSpec.describe Client do it "follows a redirect", :aggregate_failures do response = Client.make_request expect(response.status).to eq(302) expect(response.body).to eq('{"message":"Redirect"}') redirect_response = Client.make_request(response.headers.fetch('Location')) expect(redirect_response.status).to eq(200) expect(redirect_response.body).to eq('{"message":"OK"}') end end - When
-
I run
rspec spec/use_metadata_spec.rb - Then
-
it should fail and list all the failures:
Failures: 1) Client follows a redirect Got 2 failures and 1 other error: 1.1) Failure/Error: expect(response.status).to eq(302) expected: 302 got: 404 (compared using ==) # ./spec/use_metadata_spec.rb:7 1.2) Failure/Error: expect(response.body).to eq('{"message":"Redirect"}') expected: "{\"message\":\"Redirect\"}" got: "Not Found" (compared using ==) # ./spec/use_metadata_spec.rb:8 1.3) Failure/Error: redirect_response = Client.make_request(response.headers.fetch('Location')) KeyError: key not found: "Location" # ./spec/use_metadata_spec.rb:10 # ./spec/use_metadata_spec.rb:10
- Enable failure aggregation globally using `define_derived_metadata`
-
- Given
-
a file named "spec/enable_globally_spec.rb" with:
require 'client' RSpec.configure do |c| c.define_derived_metadata do |meta| meta[:aggregate_failures] = true end end RSpec.describe Client do it "returns a successful response" do response = Client.make_request expect(response.status).to eq(200) expect(response.headers).to include("Content-Type" => "application/json") expect(response.body).to eq('{"message":"Success"}') end end - When
-
I run
rspec spec/enable_globally_spec.rb - Then
-
it should fail and list all the failures:
Failures: 1) Client returns a successful response Got 3 failures: 1.1) Failure/Error: expect(response.status).to eq(200) expected: 200 got: 404 (compared using ==) # ./spec/enable_globally_spec.rb:13 1.2) Failure/Error: expect(response.headers).to include("Content-Type" => "application/json") expected {"Content-Type" => "text/plain"} to include {"Content-Type" => "application/json"} Diff: @@ -1 +1 @@ -"Content-Type" => "application/json", +"Content-Type" => "text/plain", # ./spec/enable_globally_spec.rb:14 1.3) Failure/Error: expect(response.body).to eq('{"message":"Success"}') expected: "{\"message\":\"Success\"}" got: "Not Found" (compared using ==) # ./spec/enable_globally_spec.rb:15
- Enable failure aggregation globally using `define_derived_metadata`
-
- Given
-
a file named "spec/enable_globally_spec.rb" with:
require 'client' RSpec.configure do |c| c.define_derived_metadata do |meta| meta[:aggregate_failures] = true end end RSpec.describe Client do it "returns a successful response" do response = Client.make_request expect(response.status).to eq(200) expect(response.headers).to include("Content-Type" => "application/json") expect(response.body).to eq('{"message":"Success"}') end end - When
-
I run
rspec spec/enable_globally_spec.rb - Then
-
it should fail and list all the failures:
Failures: 1) Client returns a successful response Got 3 failures: 1.1) Failure/Error: expect(response.status).to eq(200) expected: 200 got: 404 (compared using ==) # ./spec/enable_globally_spec.rb:13 1.2) Failure/Error: expect(response.headers).to include("Content-Type" => "application/json") expected {"Content-Type" => "text/plain"} to include {"Content-Type" => "application/json"} Diff: @@ -1,2 +1,2 @@ -"Content-Type" => "application/json", +"Content-Type" => "text/plain", # ./spec/enable_globally_spec.rb:14 1.3) Failure/Error: expect(response.body).to eq('{"message":"Success"}') expected: "{\"message\":\"Success\"}" got: "Not Found" (compared using ==) # ./spec/enable_globally_spec.rb:15
- Nested failure aggregation works
-
- Given
-
a file named "spec/nested_failure_aggregation_spec.rb" with:
require 'client' RSpec.describe Client do it "returns a successful response", :aggregate_failures do response = Client.make_request expect(response.status).to eq(200) aggregate_failures "testing headers" do expect(response.headers).to include("Content-Type" => "application/json") expect(response.headers).to include("Content-Length" => "21") end expect(response.body).to eq('{"message":"Success"}') end end - When
-
I run
rspec spec/nested_failure_aggregation_spec.rb - Then
-
it should fail and list all the failures:
Failures: 1) Client returns a successful response Got 3 failures: 1.1) Failure/Error: expect(response.status).to eq(200) expected: 200 got: 404 (compared using ==) # ./spec/nested_failure_aggregation_spec.rb:7 1.2) Got 2 failures from failure aggregation block "testing headers". # ./spec/nested_failure_aggregation_spec.rb:9 1.2.1) Failure/Error: expect(response.headers).to include("Content-Type" => "application/json") expected {"Content-Type" => "text/plain"} to include {"Content-Type" => "application/json"} Diff: @@ -1 +1 @@ -"Content-Type" => "application/json", +"Content-Type" => "text/plain", # ./spec/nested_failure_aggregation_spec.rb:10 1.2.2) Failure/Error: expect(response.headers).to include("Content-Length" => "21") expected {"Content-Type" => "text/plain"} to include {"Content-Length" => "21"} Diff: @@ -1 +1 @@ -"Content-Length" => "21", +"Content-Type" => "text/plain", # ./spec/nested_failure_aggregation_spec.rb:11 1.3) Failure/Error: expect(response.body).to eq('{"message":"Success"}') expected: "{\"message\":\"Success\"}" got: "Not Found" (compared using ==) # ./spec/nested_failure_aggregation_spec.rb:14
- Nested failure aggregation works
-
- Given
-
a file named "spec/nested_failure_aggregation_spec.rb" with:
require 'client' RSpec.describe Client do it "returns a successful response", :aggregate_failures do response = Client.make_request expect(response.status).to eq(200) aggregate_failures "testing headers" do expect(response.headers).to include("Content-Type" => "application/json") expect(response.headers).to include("Content-Length" => "21") end expect(response.body).to eq('{"message":"Success"}') end end - When
-
I run
rspec spec/nested_failure_aggregation_spec.rb - Then
-
it should fail and list all the failures:
Failures: 1) Client returns a successful response Got 3 failures: 1.1) Failure/Error: expect(response.status).to eq(200) expected: 200 got: 404 (compared using ==) # ./spec/nested_failure_aggregation_spec.rb:7 1.2) Got 2 failures from failure aggregation block "testing headers". # ./spec/nested_failure_aggregation_spec.rb:9 1.2.1) Failure/Error: expect(response.headers).to include("Content-Type" => "application/json") expected {"Content-Type" => "text/plain"} to include {"Content-Type" => "application/json"} Diff: @@ -1,2 +1,2 @@ -"Content-Type" => "application/json", +"Content-Type" => "text/plain", # ./spec/nested_failure_aggregation_spec.rb:10 1.2.2) Failure/Error: expect(response.headers).to include("Content-Length" => "21") expected {"Content-Type" => "text/plain"} to include {"Content-Length" => "21"} Diff: @@ -1,2 +1,2 @@ -"Content-Length" => "21", +"Content-Type" => "text/plain", # ./spec/nested_failure_aggregation_spec.rb:11 1.3) Failure/Error: expect(response.body).to eq('{"message":"Success"}') expected: "{\"message\":\"Success\"}" got: "Not Found" (compared using ==) # ./spec/nested_failure_aggregation_spec.rb:14
- Mock expectation failures are aggregated as well
-
- Given
-
a file named "spec/mock_expectation_failure_spec.rb" with:
require 'client' RSpec.describe "Aggregating Failures", :aggregate_failures do it "has a normal expectation failure and a message expectation failure" do client = double("Client") expect(client).to receive(:put).with("updated data") allow(client).to receive(:get).and_return(Response.new(404, {}, "Not Found")) response = client.get expect(response.status).to eq(200) end end - When
-
I run
rspec spec/mock_expectation_failure_spec.rb - Then
-
it should fail and list all the failures:
Failures: 1) Aggregating Failures has a normal expectation failure and a message expectation failure Got 2 failures: 1.1) Failure/Error: expect(response.status).to eq(200) expected: 200 got: 404 (compared using ==) # ./spec/mock_expectation_failure_spec.rb:10 1.2) Failure/Error: expect(client).to receive(:put).with("updated data") (Double "Client").put("updated data") expected: 1 time with arguments: ("updated data") received: 0 times # ./spec/mock_expectation_failure_spec.rb:6
- Pending integrates properly with aggregated failures
-
- Given
-
a file named "spec/pending_spec.rb" with:
require 'client' RSpec.describe Client do it "returns a successful response", :aggregate_failures do pending "Not yet ready" response = Client.make_request expect(response.status).to eq(200) expect(response.headers).to include("Content-Type" => "application/json") expect(response.body).to eq('{"message":"Success"}') end end - When
-
I run
rspec spec/pending_spec.rb - Then
-
it should pass and list all the pending examples:
Pending: (Failures listed here are expected and do not affect your suite's status) 1) Client returns a successful response # Not yet ready Got 3 failures: 1.1) Failure/Error: expect(response.status).to eq(200) expected: 200 got: 404 (compared using ==) # ./spec/pending_spec.rb:8 1.2) Failure/Error: expect(response.headers).to include("Content-Type" => "application/json") expected {"Content-Type" => "text/plain"} to include {"Content-Type" => "application/json"} Diff: @@ -1 +1 @@ -"Content-Type" => "application/json", +"Content-Type" => "text/plain", # ./spec/pending_spec.rb:9 1.3) Failure/Error: expect(response.body).to eq('{"message":"Success"}') expected: "{\"message\":\"Success\"}" got: "Not Found" (compared using ==) # ./spec/pending_spec.rb:10
- Pending integrates properly with aggregated failures
-
- Given
-
a file named "spec/pending_spec.rb" with:
require 'client' RSpec.describe Client do it "returns a successful response", :aggregate_failures do pending "Not yet ready" response = Client.make_request expect(response.status).to eq(200) expect(response.headers).to include("Content-Type" => "application/json") expect(response.body).to eq('{"message":"Success"}') end end - When
-
I run
rspec spec/pending_spec.rb - Then
-
it should pass and list all the pending examples:
Pending: (Failures listed here are expected and do not affect your suite's status) 1) Client returns a successful response # Not yet ready Got 3 failures: 1.1) Failure/Error: expect(response.status).to eq(200) expected: 200 got: 404 (compared using ==) # ./spec/pending_spec.rb:8 1.2) Failure/Error: expect(response.headers).to include("Content-Type" => "application/json") expected {"Content-Type" => "text/plain"} to include {"Content-Type" => "application/json"} Diff: @@ -1,2 +1,2 @@ -"Content-Type" => "application/json", +"Content-Type" => "text/plain", # ./spec/pending_spec.rb:9 1.3) Failure/Error: expect(response.body).to eq('{"message":"Success"}') expected: "{\"message\":\"Success\"}" got: "Not Found" (compared using ==) # ./spec/pending_spec.rb:10
Last published over 1 year ago by Jon Rowe.