Keploy E2e Test

keploy-e2e-test

End-to-end verification of a change in keploy/keploy by building the binary from source and driving it through real record → replay against a real sample app, exactly the way CI does.

When to use

Trigger this skill whenever the user asks to:

• test / verify / prove a change works against a real app
• add e2e coverage for a fix, feature, or PR
• reproduce an issue against one of the sample apps
• wire a new behavior into the CI matrix

When to decline (and say so explicitly)

Before doing any work, decide whether e2e record/replay is even the right signal. Skip with a clear, short reason if:

• Pure refactor / internal rename. No observable behavior changed. Unit tests + go build + golangci-lint run is enough.
• Enterprise-only code path. The logic lives in the private keploy/integrations repo, not in this tree. You cannot fully exercise it from a fresh fork — CI skips those jobs on forks, and so should you. Say so and stop.
• CLI-only / output-formatting changes. If the change is in help text, flag parsing, or log formatting, a unit test or a manual keploy --help check is sufficient.
• Docs / workflow YAML only. No behavior change.
• Infrastructure the script relies on is missing. If the affected code path needs a dependency (eBPF kernel features, a managed DB, a paid service) that isn't available in the sandbox you're running in, say so and propose what would be needed instead of half-running.
• The user hasn't told you what changed. Ask. Don't guess an app.

If you skip, say why in one or two sentences and stop — do not silently fall back to "just run the unit tests."

• Also, you can even skip unit tests if they dont make sense because our code keeps on changing.
• If you are unsure about some stuff make sure you ask for approval before doing so.

Step 1 — Understand the change

Before touching anything, build a concrete picture of:

1. What code changed. Read the diff (git diff main...HEAD, or the files the user points at). For a PR, read the PR description and the changed files — not just the titles.
2. Which code path it exercises.
   • Is it HTTP request/response matching? (pkg/matcher, pkg/service/replay)
   • A protocol parser? (pkg/core/proxy, pkg/models/<protocol>, pkg/agent/hooks)
   • On-disk YAML format? (pkg/platform/yaml)
   • Mock correlation / ordering? (pkg/service/orchestrator)
   • Reports / coverage? (pkg/service/report, pkg/platform/coverage)
   • A CLI command or flag? (cli/<cmd>.go, config/config.go)
   • Memory / performance? (pkg/agent/memoryguard, main.go)
3. What user-visible behavior should now change. State it in one sentence before you start looking for an app.
4. What the failure mode would look like in a report — a missing mock? a status mismatch? a race in the record log? Knowing this up front tells you what to grep for after replay.

If the affected path is obvious from the diff, say so and move on. If it isn't, say so and ask — do not guess.

Step 2 — Find an existing sample app that exercises this path

Search broadly across the keploy organization for a sample that already exercises the affected surface area. The sample repos CI pulls from are in AGENTS.md under "Sample repos CI pulls from"; the complete list of sample repos on the org is discoverable with gh repo list keploy. its usually samples-* which * can be go, java etc.

How to search, in rough order of cost:

1. Look at the existing script directory first. The canonical index of what's already covered is .github/workflows/test_workflow_scripts/. Each subdirectory maps 1:1 to a sample app, and the shell script inside is what CI actually runs against that app. ls that tree — if one of the names obviously matches your changed path (e.g. you changed DNS parsing → check golang/dns_mock/, golang/dns_dedup/), read that script first.
2. Search the matrix entries. grep -rn script_dir .github/workflows/*.yml shows every app currently wired into CI with its path (directory in the samples repo) and script_dir (directory in test_workflow_scripts).
3. Search the sample repos themselves. For a protocol or stack not covered by an in-tree script:

   gh api repos/keploy/samples-go/contents/       --jq '.[] | select(.type == "dir") | .name'
   gh api repos/keploy/samples-python/contents/   --jq '.[] | select(.type == "dir") | .name'
   gh api repos/keploy/samples-typescript/contents/ --jq '.[] | select(.type == "dir") | .name'
   gh api repos/keploy/samples-java/contents/     --jq '.[] | select(.type == "dir") | .name'
   gh api repos/keploy/samples-rust/contents/     --jq '.[] | select(.type == "dir") | .name'
   gh api repos/keploy/samples-csharp/contents/   --jq '.[] | select(.type == "dir") | .name'
   

   Don't hard-code which repo to look in — the best match may be in a less-obvious place (e.g. a graphql-over-postgres change might be best exercised by samples-go/graphql-sql or by samples-java/spring-boot-postgres-graphql). Skim each candidate's README in the sample repo before committing.
4. When nothing fits. If no sample on the org exercises the affected path, you have two honest options:
   • Extend the closest existing sample (see Step 3b).
   • Add a new minimal sample (see Step 3c). This is the last resort — new samples are expensive to maintain.
   • dont be relunctant to do these steps if you think it is necessary.

Step 3 — Decide: use, extend, or create

3a. Use as-is (preferred)

If an existing test_workflow_scripts/<lang>/<script_dir>/<lang>-linux.sh already exercises the exact behavior your change touches — use it. Don't modify the script. Just build the binary and run it (Step 4).

3b. Extend an existing script (second preference)

If the app is right but the script doesn't cover the new behavior, make the minimal additive change:

• Add the new traffic call inside the existing send_request() (or whatever the script calls its traffic driver).
• If the change introduces a new report field or a new exit-code expectation, add a new check after the existing check_test_report / report-walking loop — do not rewrite the loop.
• Keep everything that already passes passing. If you must change an existing assertion, state why explicitly in a comment on that line.
• Preserve the script's prevailing style — set -Eeuo pipefail vs. plain, section/endsec GitHub grouping helpers, trap handlers, 1 vs. 2 record iterations. Match what's already there.

When in doubt, look at how recent extensions were done by reading the git history of the script you're editing.

Please dont break existing code while doing it.

3c. Create a new sample + script (last resort)

Only if no existing app exercises the path. This has two sides:

Sample-app side (in keploy/samples-<lang>/):

• Keep it minimal: one binary / module, one HTTP surface, one dependency if required. Match the structure of the smallest existing samples in the same repo (e.g. samples-go/http-pokeapi, samples-python/flask-secret).
• You cannot merge a new sample into the org sample repos yourself without a PR there. If that's out of scope for this task, say so and propose the sample contents instead of silently trying to checkout a branch that doesn't exist. Do create a PR in the sample repository while using the skill keploy-pr-workflow to create the PR.

keploy/keploy side (this repo):

• Create .github/workflows/test_workflow_scripts/<lang>/<script_dir>/<lang>-linux.sh. Name <script_dir> as lower_snake_case of the sample folder name (convention: see existing mappings — echo-mysql → echo_mysql, http-pokeapi → http_pokeapi, go-grpc → go-grpc (kept hyphenated here, so copy the convention of the closest existing neighbor rather than normalizing blindly)).
• Copy the boilerplate from the closest existing script in the same language. Canonical references:
  • Go + HTTP: .github/workflows/test_workflow_scripts/golang/http_pokeapi/golang-linux.sh
  • Go + SQL/MySQL: .github/workflows/test_workflow_scripts/golang/echo_mysql/golang-linux.sh
  • Node + Mongo: .github/workflows/test_workflow_scripts/node/express_mongoose/node-linux.sh
  • Python + Flask: .github/workflows/test_workflow_scripts/python/flask-secret/python-linux.sh
  • Java + Postgres: .github/workflows/test_workflow_scripts/java/spring_petclinic/java-linux.sh
  • gRPC (modes): .github/workflows/test_workflow_scripts/golang/go-grpc/grpc-linux.sh
• Add a matrix entry under the right per-language workflow:
  • Go native Linux → .github/workflows/golang_linux.yml
  • Go Docker → .github/workflows/golang_docker.yml
  • gRPC → .github/workflows/grpc_linux.yml
  • Python → .github/workflows/python_linux.yml (native) / python_docker.yml
  • Node → .github/workflows/node_linux.yml / node_docker.yml
  • Java → .github/workflows/java_linux.yml
  • Schema match → .github/workflows/schema_match_linux.yml The entry must have name, path (dir inside the samples repo), script_dir (dir inside test_workflow_scripts/<lang>/), plus any extra axes the workflow uses (e.g. mode, enable_ssl).
• Do not add a new top-level workflow file; reuse the existing one for the language. The gate job in prepare_and_run.yml depends on the existing workflow names — new ones won't be required checks.
• If needed, you can create a new workflow file but try to add a new step in the existing workflow file if possible. that's much better than creating a new workflow file.
• If the sample needs a branch of the samples repo other than main, follow the existing pattern of git fetch origin && git checkout origin/<branch> at the top of the script (see echo_mysql, risk_profile, sse_preflight). Document that branch in the PR description on the samples-repo side.

Step 4 — Run record / replay locally

Always build the binary the same way CI does before running:

# matches CI's "build-no-race" artifact
go build -tags=viper_bind_struct -o ./out/build-no-race/keploy .

# matches CI's "build" artifact (race-enabled; needs CGO)
CGO_ENABLED=1 go build -race -tags=viper_bind_struct -o ./out/build/keploy .

Then run the script the way CI does (from inside the sample app directory), passing the binaries through the env:

# Checkout samples repo beside this one (once)
git clone https://github.com/keploy/samples-go   ../samples-go

cd ../samples-go/<matrix.app.path>

RECORD_BIN=/abs/path/to/keploy/out/build/keploy \
REPLAY_BIN=/abs/path/to/keploy/out/build/keploy \
GITHUB_WORKSPACE=/abs/path/to/keploy \
bash -x $GITHUB_WORKSPACE/.github/workflows/test_workflow_scripts/<lang>/<script_dir>/<lang>-linux.sh

GITHUB_WORKSPACE must point at the keploy repo root because scripts source test-iid.sh and update-java.sh via that path.

On Linux, keploy needs root for eBPF — most scripts use sudo on specific commands. Don't add sudo to the whole script invocation if the script doesn't already do that; copy the pattern used by the existing scripts (selective sudo -E env PATH=$PATH "$RECORD_BIN" …, sometimes sudo "$RECORD_BIN" config --generate).

On macOS/Windows the same script pattern won't work unmodified — in those environments either fall back to the *_macos.yml / *_windows.yml / .ps1 counterparts, or say you can't reproduce locally and run it via CI. State that limitation explicitly rather than pretending to test.

If you can't run the script locally (no Docker, no eBPF support in a container, missing dependency), say so. Do not claim success without real evidence.

Step 5 — Verify

The script's own success criterion is: all ./keploy/reports/test-run-*/ test-set-*-report.yaml have status: PASSED, and no "ERROR" or "WARNING: DATA RACE" lines appeared in the record or test logs.

You must independently verify the same:

# the newest test-run dir
RUN_DIR=$(ls -1dt ./keploy/reports/test-run-* | head -n1)

# every report should say PASSED
for rpt in "$RUN_DIR"/test-set-*-report.yaml; do
  awk '/^status:/{print FILENAME": "$2; exit}' "$rpt"
done

# coverage (when the sample enables it)
[ -f "$RUN_DIR/coverage.yaml" ] && cat "$RUN_DIR/coverage.yaml"

Additionally:

• Confirm record ran the expected number of iterations (most scripts loop 1 or 2 times — check the for i in 1 2; do construct).
• If the change is behavior-additive, the new test case or new assertion you added must be present in a generated test-set-<n>/tests/test-*.yaml or in the report's per-test breakdown.
• If the change is a fix, run the script against the previous main binary first (use the latest artifact pattern from CI, or just build main into a separate path). Confirm the script fails before your change and passes after. That is the clean proof of a fix.
• Grep record and replay logs for the known-fatal markers: grep -E "ERROR|WARNING: DATA RACE". An "ERROR" line in keploy output fails the script in CI; reproduce that gate locally.

Step 6 — Report back

End with a short, factual summary:

• Which sample app was used (samples-<lang>/<path>), and whether it was used as-is, extended, or newly created.
• Which script ran (test_workflow_scripts/<lang>/<script_dir>/<lang>-linux.sh).
• What command produced the evidence (the exact RECORD_BIN=… REPLAY_BIN=… bash … line).
• What the reports said (how many test sets, all PASSED, coverage %).
• If a pre-change run showed the failure mode, say so and include the relevant diff in report output.
• If you skipped e2e, say which skip reason applied from the list at the top — don't invent a new reason.
• If something is failing with your changes or you found a bug in the implementation using this test then please try to fix it by finding the root cause. If you cant then report it to the user.

What not to do

• Don't invent a new shell-script pattern. If the existing scripts use set -Eeuo pipefail + ::group:: sections + a die trap, match that; if they use a simpler linear style (http_pokeapi), match that. Pick one of the existing templates as a starting point.
• Don't commit keploy/, keploy.yml, *_logs.txt, or other run artifacts from a sample app. Those are generated per run. It might be needed if the only thing you are checking is the test mode or other modes and you know you havent made any changes to the record mode. We can save CI times by not running the record mode.
• Don't edit generated eBPF Go (pkg/agent/hooks/bpf_*_bpfel.go) as part of the e2e flow. If the eBPF programs need to change, that belongs in a separate, intentional step (edit the .c source and regenerate).
• Don't skip the cross-version matrix dimension. The three configs (record_latest_replay_build, record_build_replay_latest, record_build_replay_build) exist to catch mock-format incompatibility. If your change would be gated on "both sides are new," either add capability detection (see .github/workflows/test_workflow_scripts/golang/risk_profile/golang-linux.sh and connect_tunnel/golang-linux.sh for how the existing scripts distinguish */build/keploy from latest), or flag the incompatibility to the user so they can decide.
• Don't claim "tests pass" from compilation alone. go build succeeding isn't a substitute for a real replay run. If you couldn't run, say so.

For anything in samples repo side changes, you must have created a branch. Use that branch has ref in keploy/keploy to test it.