[tests] suppress debug logs in CI environment + improve calendar symbol test stability (#3941)

## CI Log Suppression

**Two-level approach for clean test output:**

1. **Suppress debug/info logs**: Call `logger.setLogLevel("ERROR")` in
CI to hide verbose logging
2. **Suppress intentional error logs**: Set `mmTestMode` flag and check
it before logging errors that are part of test assertions (e.g., testing
error handling in `git_helper.js` and `server_functions.js`)

This keeps CI output clean and makes genuine failures immediately
visible, while preserving full logging for local development.

**Before:** 1348 log lines with verbose debug/info output  
**After:** 168 log clean lines with only test results

## Calendar Symbol Test Stability

Convert the calendar symbol test from external URL (`calendarlabs.com`)
to existing local mock file (`12_events.ics`). This eliminates CI
timeouts caused by external dependencies and improves test reliability.

The test still validates the same symbol array feature but now runs
faster and deterministically without network dependencies.

CHANGELOG.md

@@ -22,7 +22,7 @@ planned for 2026-01-01
 - [check_config] refactor: improve error handling (#3927)
 - [calendar] test: remove "Recurring event per timezone" test (#3929)
 - [calendar] chore: remove `requiresVersion: "2.1.0"` (#3932)
-- [tests] migrate from `jest` to `vitest` (#3940)
+- [tests] migrate from `jest` to `vitest` (#3940, #3941)
 
 ### Fixed
 

js/server_functions.js

@@ -58,7 +58,10 @@ async function cors (req, res) {
 			res.send(data);
 		}
 	} catch (error) {
+		// Only log errors in non-test environments to keep test output clean
+		if (process.env.mmTestMode !== "true") {
 			Log.error(error);
+		}
 		res.send(error);
 	}
 }

modules/default/updatenotification/git_helper.js

@@ -183,9 +183,12 @@ class GitHelper {
 					this.gitResultList.push(gitInfo);
 				}
 			} catch (e) {
+				// Only log errors in non-test environments to keep test output clean
+				if (process.env.mmTestMode !== "true") {
 					Log.error(`Failed to retrieve repo info for ${repo.module}: ${e}`);
 				}
 			}
+		}
 
 		return this.gitResultList;
 	}

tests/configs/modules/calendar/symboltest.js

@@ -12,9 +12,8 @@ let config = {
 				maximumEntries: 1,
 				calendars: [
 					{
-						fetchInterval: 7 * 24 * 60 * 60 * 1000,
 						symbol: ["calendar-check", "google"],
-						url: "https://ics.calendarlabs.com/76/mm3137/US_Holidays.ics"
+						url: "http://localhost:8080/tests/mocks/12_events.ics"
 					}
 				]
 			}

tests/utils/vitest-setup.js

@@ -1,19 +1,33 @@
 /**
- * Vitest setup file for module aliasing
+ * Vitest setup file for module aliasing and CI logging
  * This allows require("logger") to work in unit tests
  */
 
 const Module = require("node:module");
 const path = require("node:path");
 
+// Set test mode flag for application code to detect test environment
+process.env.mmTestMode = "true";
+
 // Store the original require
 const originalRequire = Module.prototype.require;
 
+// Track if we've already applied log level
+let logLevelApplied = false;
+
 // Override require to handle our custom aliases
 Module.prototype.require = function (id) {
 	// Handle "logger" alias
 	if (id === "logger") {
-		return originalRequire.call(this, path.resolve(__dirname, "../../js/logger.js"));
+		const logger = originalRequire.call(this, path.resolve(__dirname, "../../js/logger.js"));
+
+		// Suppress debug/info logs in CI to keep output clean
+		if (!logLevelApplied && process.env.CI === "true") {
+			logger.setLogLevel("ERROR");
+			logLevelApplied = true;
+		}
+
+		return logger;
 	}
 
 	// Handle all other requires normally