✨ Add --log-level flag to frontend test runner

Lets a caller pin `app.common.logging`'s level for the duration of a
test run via `--log-level <trace|debug|info|warn|error>`. The flag is
off by default, so when absent the runner doesn't touch logger state
and stdout looks exactly as before.

When passed, the runner calls `(l/setup! {:app level})` right before
dispatching to the test block, so production code exercised by tests
emits only at the requested level or higher.

  pnpm run test:quiet -- --focus frontend-tests.logic.groups-test \
                         --log-level warn

Composes with `--focus`; the two flags are independent.

Caveats worth knowing: top-level log calls fired at namespace load
time run before the runner parses CLI options and therefore slip past
this flag; direct `println` / `js/console.log` calls bypass the
logging system entirely and are unaffected.

.serena/memories/frontend/testing.md

@@ -10,6 +10,7 @@ From `frontend/`:
 - Full unit test run: `pnpm run test:quiet`.
 - Focus a frontend CLJS test namespace: `pnpm run test:quiet -- --focus frontend-tests.logic.components-and-tokens`.
 - Focus one frontend CLJS test var: `pnpm run test:quiet -- --focus frontend-tests.logic.components-and-tokens/change-spacing-token-in-main-updates-copy-layout`.
+- Quiet `app.*` logging during a run: append `--log-level warn` (or `trace|debug|info|warn|error`).
 - Build test target only: `pnpm run build:test`.
 - After `pnpm run build:test`, direct compiled runner focus is faster: `node target/tests/test.js --focus frontend-tests.logic.components-and-tokens/change-spacing-token-in-main-updates-copy-layout`.
 - Watch tests: `pnpm run watch:test`.

docs/technical-guide/developer/common.md

@@ -292,6 +292,9 @@ pnpm run test -- --focus frontend-tests.logic.components-and-tokens
 
 # To run a single frontend test
 pnpm run test -- --focus frontend-tests.logic.components-and-tokens/change-token-in-main
+
+# To quiet app-level logging during the run (trace|debug|info|warn|error)
+pnpm run test -- --focus frontend-tests.logic.components-and-tokens --log-level warn
 ```
 
 For non-interactive runs (CI, scripted invocations, agent loops), use the quiet

frontend/test/frontend_tests/runner.cljs

@@ -1,5 +1,6 @@
 (ns frontend-tests.runner
   (:require
+   [app.common.logging :as l]
    [cljs.test :as t]
    [clojure.string :as str]
    [clojure.tools.cli :refer [parse-opts]]
@@ -93,8 +94,14 @@
 (assert (every? find-ns-obj test-namespaces)
         "test-namespaces contains a namespace that isn't required in runner.cljs")
 
+(def ^:private log-levels
+  #{:trace :debug :info :warn :error})
+
 (def cli-options
   [["-f" "--focus FOCUS" "Run one test namespace or one test var, e.g. frontend-tests.logic.components-and-tokens/change-token-in-main"]
+   ["-l" "--log-level LEVEL" "Set app logger level: trace|debug|info|warn|error"
+    :parse-fn keyword
+    :validate [log-levels "must be one of trace, debug, info, warn, error"]]
    ["-h" "--help"]])
 
 (defn- argv
@@ -114,7 +121,9 @@
        summary "\n\n"
        "Focus examples:\n"
        "  pnpm run test -- --focus frontend-tests.logic.components-and-tokens\n"
-       "  pnpm run test -- --focus frontend-tests.logic.components-and-tokens/change-token-in-main"))
+       "  pnpm run test -- --focus frontend-tests.logic.components-and-tokens/change-token-in-main\n\n"
+       "Log level example (quiets app logging during the run):\n"
+       "  pnpm run test -- --focus frontend-tests.logic.groups-test --log-level warn"))
 
 (defn- fail!
   [message]
@@ -218,8 +227,10 @@
         (println (usage summary))
         (.exit js/process 0))
 
-      (:focus options)
-      (run-focused-test! (:focus options))
-
       :else
-      (run-test-vars! (map #(selected-tests {:ns %}) test-namespaces)))))
+      (do
+        (when-let [level (:log-level options)]
+          (l/setup! {:app level}))
+        (if (:focus options)
+          (run-focused-test! (:focus options))
+          (run-test-vars! (map #(selected-tests {:ns %}) test-namespaces)))))))