test(server): Suppress intentional log output in unit tests

Tests that exercise error and build paths leaked log lines into the test
output because @ui5/logger writes to process.stderr whenever its process
events have no listener attached, obscuring real failures.

Attach no-op listeners to every logger event with a stderr fallback via an
AVA --import setup module, and stub the raw stderr password prompt in the
sslUtil test through file-level hooks.

Author: matz3

packages/server/ava.config.js

@@ -1,3 +1,10 @@
 import avaCommonConfig from "../../ava.common.config.js";
 
-export default avaCommonConfig;
+export default {
+	...avaCommonConfig,
+	nodeArguments: [
+		...avaCommonConfig.nodeArguments,
+		"--import",
+		"./test/utils/suppressLog.js"
+	]
+};

packages/server/test/lib/server/sslUtil.js

@@ -17,6 +17,18 @@ function fileExists(filePath) {
 	});
 }
 
+// Certificate creation prints a "please enter your root password" prompt straight
+// to stderr (not via @ui5/logger). No test asserts on stderr, so silence it once for
+// the whole file. A file-level hook (rather than beforeEach) avoids concurrent tests
+// racing to stub the same global process.stderr.
+let stderrWriteStub;
+test.before(() => {
+	stderrWriteStub = sinon.stub(process.stderr, "write");
+});
+test.after.always(() => {
+	stderrWriteStub.restore();
+});
+
 test.beforeEach(async (t) => {
 	t.context.yesno = sinon.stub();
 	t.context.devcertSanscache = sinon.stub();

packages/server/test/utils/suppressLog.js

@@ -0,0 +1,14 @@
+// @ui5/logger writes messages straight to process.stderr whenever the corresponding
+// process event has no listener attached (see the fallback branches in the loggers
+// under @ui5/logger/lib/loggers). Several server tests intentionally exercise error
+// and build paths whose logs would otherwise clutter the test output and obscure real
+// failures. Attaching a no-op listener to each event with a stderr fallback routes
+// those messages to the (ignored) event instead.
+for (const event of [
+	"ui5.log", // Logger#_emitOrLog
+	"ui5.build-status", // loggers/Build
+	"ui5.project-build-status", // loggers/ProjectBuild
+	"ui5.serve-status", // loggers/Serve
+]) {
+	process.on(event, () => {});
+}