Enable EVP flagevaluation system tests for Node.js

[leoromanovsky]

Motivation

tests/ffe/test_flag_eval_evp.py now covers the EVP flagevaluation contract for server-side SDKs. Node.js has a passing local focused run against the implementation PR, so its manifest can move from missing_feature (FFL-2446) to the validated version.

Changes

• Enables tests/ffe/test_flag_eval_evp.py for the validated Node.js express4 weblog in manifests/nodejs.yml at *ref_6_0_0; other Node.js weblogs remain incomplete_test_app.
• Leaves the test implementation unchanged from Add EVP flagevaluation system tests #7146.
• Keeps this as a sibling PR based on leo.romanovsky/ffe-evp-flagevaluation-system-tests, not stacked on other language enablement branches.

Decisions

• This PR enables only the validated Node.js weblog; other languages are enabled by separate sibling PRs after their own local pass evidence.
• Existing OTel metric coverage stays in tests/ffe/test_flag_eval_metrics.py.

Validation

• SYSTEM_TEST_BUILD_TIMEOUT=1200 ./build.sh --library nodejs --weblog-variant express4 --docker-platform linux/amd64 - PASS on 2026-06-20.
• TEST_LIBRARY=nodejs WEBLOG_VARIANT=express4 ./run.sh +l nodejs FEATURE_FLAGGING_AND_EXPERIMENTATION -k "test_flag_eval_evp" - PASS on 2026-06-20, 8 passed, 2627 deselected in 260.16s.
• Agent 7.80.1; library nodejs@6.0.0-pre; weblog express4; Linux x86_64.
• Agent mock-intake aggregation and degradation cases passed in the focused run.
• Real-backend dogfooding prefix is recorded in the Node.js SDK PR: server-evp-e2e-nodejs-1781931066-user-.

[github-actions]

CODEOWNERS have been resolved as:

manifests/nodejs.yml                                                    @DataDog/dd-trace-js
tests/ffe/test_flag_eval_evp.py                                         @DataDog/feature-flagging-and-experimentation-sdk @DataDog/system-tests-core

[datadog-prod-us1-6]

 

✨ Fix all issues with BitsAI

⚠️ Warnings

🚦 4 Pipeline jobs failed

Testing the test | System Tests (nodejs, dev) / End-to-end #1 / express4 1     

🧪 8 Tests failed

tests.ffe.test_flag_eval_evp.Test_FFE_EVP_Flagevaluation_Basic.test_ffe_evp_flagevaluation_basic[express4] from system_tests_suite  

AssertionError: Timed out waiting for EVP flagevaluation event for flag evp-basic-flag
assert False
 +  where False = <bound method ProxyBasedInterfaceValidator.wait_for of AgentInterfaceValidator('agent')>(<function wait_for_evp_flagevaluation_event.<locals>.<lambda> at 0x7f6faac7eca0>, timeout=30)
 +    where <bound method ProxyBasedInterfaceValidator.wait_for of AgentInterfaceValidator('agent')> = AgentInterfaceValidator('agent').wait_for
 +      where AgentInterfaceValidator('agent') = interfaces.agent

self = <tests.ffe.test_flag_eval_evp.Test_FFE_EVP_Flagevaluation_Basic object at 0x7f6fdc5d3440>

    def test_ffe_evp_flagevaluation_basic(self) -> None:
        assert self.r.status_code == 200, f"Flag evaluation failed: {self.r.text}"
...

tests.ffe.test_flag_eval_evp.Test_FFE_EVP_Flagevaluation_Burst_Aggregation.test_ffe_evp_flagevaluation_burst_aggregation[express4] from system_tests_suite  

AssertionError: Timed out waiting for EVP flagevaluation event for flag evp-burst-aggregation-flag
assert False
 +  where False = <bound method ProxyBasedInterfaceValidator.wait_for of AgentInterfaceValidator('agent')>(<function wait_for_evp_flagevaluation_event.<locals>.<lambda> at 0x7f6fab45ce00>, timeout=30)
 +    where <bound method ProxyBasedInterfaceValidator.wait_for of AgentInterfaceValidator('agent')> = AgentInterfaceValidator('agent').wait_for
 +      where AgentInterfaceValidator('agent') = interfaces.agent

self = <tests.ffe.test_flag_eval_evp.Test_FFE_EVP_Flagevaluation_Burst_Aggregation object at 0x7f6fdc5d1220>

    def test_ffe_evp_flagevaluation_burst_aggregation(self) -> None:
        for index, response in enumerate(self.responses):
...

View all 8 test failures

Testing the test | System Tests (php, dev) / End-to-end #1 / apache-mod-8.0 1     

🧪 1 Test failed

tests.ffe.test_exposures.Test_FFE_Exposure_Events.test_ffe_multiple_remote_config_files[apache-mod-8.0] from system_tests_suite  

AssertionError: Timed out waiting for exposure event for flags ['test-flag-1', 'test-flag-2'] and subject 'test-user-multi'
assert False
 +  where False = <bound method ProxyBasedInterfaceValidator.wait_for of AgentInterfaceValidator('agent')>(<function wait_for_exposure_event.<locals>.<lambda> at 0x7f723f2dede0>, timeout=30)
 +    where <bound method ProxyBasedInterfaceValidator.wait_for of AgentInterfaceValidator('agent')> = AgentInterfaceValidator('agent').wait_for
 +      where AgentInterfaceValidator('agent') = interfaces.agent

self = <tests.ffe.test_exposures.Test_FFE_Exposure_Events object at 0x7f726c66ef30>

    def test_ffe_multiple_remote_config_files(self):
        """Test that FFE correctly handles multiple remote config files with different flags."""
...

Testing the test | System Tests (php, prod) / End-to-end #1 / apache-mod-7.3 1     

🧪 1 Test failed

tests.ffe.test_exposures.Test_FFE_Exposure_Events.test_ffe_multiple_remote_config_files[apache-mod-7.3] from system_tests_suite  

AssertionError: Timed out waiting for exposure event for flags ['test-flag-1', 'test-flag-2'] and subject 'test-user-multi'
assert False
 +  where False = <bound method ProxyBasedInterfaceValidator.wait_for of AgentInterfaceValidator('agent')>(<function wait_for_exposure_event.<locals>.<lambda> at 0x7f936f2eed40>, timeout=30)
 +    where <bound method ProxyBasedInterfaceValidator.wait_for of AgentInterfaceValidator('agent')> = AgentInterfaceValidator('agent').wait_for
 +      where AgentInterfaceValidator('agent') = interfaces.agent

self = <tests.ffe.test_exposures.Test_FFE_Exposure_Events object at 0x7f9395e97e00>

    def test_ffe_multiple_remote_config_files(self):
        """Test that FFE correctly handles multiple remote config files with different flags."""
...

View all 4 failed jobs.

ℹ️ Info

No other issues found (see more)

❄️ No new flaky tests detected

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[datadog-system-tests-org]

⚠️ Warnings

🚦 4 Pipeline jobs failed

Testing the test | System Tests (nodejs, dev) / End-to-end #1 / express4 1     

Testing the test | System Tests (php, dev) / End-to-end #1 / apache-mod-8.0 1     

Testing the test | System Tests (php, prod) / End-to-end #1 / apache-mod-7.3 1     

View all 4 failed jobs.

_{This comment will be updated automatically if new data arrives.
🔗 Commit SHA: a03c3fb | Docs | Give us feedback!}