auto instrumentation tests for knapsack

Rakefile

@@ -79,6 +79,9 @@ TEST_METADATA = {
   "knapsack_rspec" => {
     "knapsack_pro-7-rspec-3" => "✅ 2.7 / ✅ 3.0 / ✅ 3.1 / ✅ 3.2 / ✅ 3.3 / ✅ 3.4 / ❌ jruby"
   },
+  "knapsack_auto_instrument" => {
+    "knapsack_pro-7-rspec-3" => "✅ 2.7 / ✅ 3.0 / ✅ 3.1 / ✅ 3.2 / ✅ 3.3 / ✅ 3.4 / ❌ jruby"
+  },
   "selenium" => {
     "selenium-4-capybara-3" => "❌ 2.7 / ✅ 3.0 / ✅ 3.1 / ✅ 3.2 / ✅ 3.3 / ❌ 3.4 / ✅ jruby"
   },
@@ -157,6 +160,7 @@ namespace :spec do
     ci_queue_minitest
     ci_queue_rspec
     knapsack_rspec
+    knapsack_auto_instrument
     selenium timecop
   ].each do |contrib|
     desc "" # "Explicitly hiding from `rake -T`"

spec/datadog/ci/contrib/knapsack_auto_instrument/instrumentation_spec.rb

@@ -0,0 +1,80 @@
+RSpec.describe "Knapsack Pro runner when Datadog::CI is auto instrumented" do
+  let(:integration) { Datadog::CI::Contrib::Instrumentation.fetch_integration(:rspec) }
+
+  include_context "CI mode activated" do
+    let(:integration_name) { :no_instrument }
+  end
+
+  before do
+    require_relative "../../../../../lib/datadog/ci/auto_instrument"
+
+    require "fileutils"
+    require "knapsack_pro"
+
+    expect(Datadog::CI).to receive(:start_test_session).never
+    expect(Datadog::CI).to receive(:start_test_module).never
+    expect(Datadog::CI).to receive(:start_test_suite).never
+    expect(Datadog::CI).to receive(:start_test).never
+
+    allow_any_instance_of(Datadog::Core::Remote::Negotiation).to(
+      receive(:endpoint?).with("/evp_proxy/v4/").and_return(true)
+    )
+
+    allow(Datadog::CI::Utils::TestRun).to receive(:command).and_return("knapsack:queue:rspec")
+
+    allow_any_instance_of(KnapsackPro::Runners::Queue::RSpecRunner).to receive(:test_file_paths).and_return(
+      ["./spec/datadog/ci/contrib/knapsack_rspec/suite_under_test/some_test_rspec.rb"],
+      []
+    )
+
+    # raise to prevent Knapsack from running Kernel.exit(0)
+    allow(KnapsackPro::Report).to receive(:save_node_queue_to_api).and_raise(ArgumentError)
+  end
+
+  it "instruments this rspec session" do
+    with_new_rspec_environment do
+      ClimateControl.modify(
+        "KNAPSACK_PRO_CI_NODE_BUILD_ID" => "144",
+        "KNAPSACK_PRO_TEST_SUITE_TOKEN_RSPEC" => "example_token",
+        "KNAPSACK_PRO_FIXED_QUEUE_SPLIT" => "true",
+        "KNAPSACK_PRO_QUEUE_ID" => nil
+      ) do
+        KnapsackPro::Adapters::RSpecAdapter.bind
+        KnapsackPro::Runners::Queue::RSpecRunner.run("", devnull, devnull)
+      rescue ArgumentError
+        # suppress invalid API key error
+      end
+    end
+
+    # test session and module traced
+    expect(test_session_span).not_to be_nil
+    expect(test_session_span).to have_test_tag(:framework, "rspec")
+    expect(test_session_span).to have_test_tag(:framework_version, integration.version.to_s)
+
+    expect(test_module_span).not_to be_nil
+
+    # test session and module are failed
+    expect([test_session_span, test_module_span]).to all have_fail_status
+
+    # single test suite span
+    expect(test_suite_spans).to have(1).item
+    expect(test_suite_spans.first).to have_test_tag(:status, Datadog::CI::Ext::Test::Status::FAIL)
+    expect(test_suite_spans.first).to have_test_tag(
+      :suite,
+      "SomeTest at ./spec/datadog/ci/contrib/knapsack_rspec/suite_under_test/some_test_rspec.rb"
+    )
+
+    # there is test span for every test case
+    expect(test_spans).to have(2).items
+    # test spans belong to a single test suite
+    expect(test_spans).to have_unique_tag_values_count(:test_suite_id, 1)
+    expect(test_spans).to have_tag_values_no_order(
+      :status,
+      [Datadog::CI::Ext::Test::Status::FAIL, Datadog::CI::Ext::Test::Status::PASS]
+    )
+
+    # every test span is connected to test module and test session
+    expect(test_spans).to all have_test_tag(:test_module_id)
+    expect(test_spans).to all have_test_tag(:test_session_id)
+  end
+end