tests: add end to end deletion test

Author: gagik

packages/e2e-tests/test/e2e.spec.ts

@@ -1723,11 +1723,36 @@ describe('e2e', function () {
             );
 
             expect(await existingFiles(paths)).equals('1111111111');
+          });
+        });
+
+        describe('with custom log max file count', function () {
+          const customLogDir = useTmpdir();
+
+          it('should delete files once it is above the max file limit', async function () {
+            const globalConfig = path.join(homedir, 'globalconfig.conf');
+            await fs.writeFile(
+              globalConfig,
+              `mongosh:\n  logLocation: "${customLogDir.path}"\n  logMaxFileCount: 5`
+            );
+            const paths: string[] = [];
+            const offset = Math.floor(Date.now() / 1000);
+            for (let i = 0; i < 10; i++) {
+              const filename = path.join(
+                customLogDir.path,
+                ObjectId.createFromTime(offset - i).toHexString() + '_log'
+              );
+              await fs.writeFile(filename, '');
+              paths.unshift(filename);
+            }
 
+            // All 10 existing log files exist.
+            expect(await existingFiles(paths)).to.equal('1111111111');
             shell = this.startTestShell({
               args: ['--nodb'],
               env: {
                 ...env,
+                MONGOSH_TEST_ONLY_MAX_LOG_FILE_COUNT: '',
                 MONGOSH_GLOBAL_CONFIG_FILE_FOR_TESTING: globalConfig,
               },
               forceTerminal: true,
@@ -1736,9 +1761,24 @@ describe('e2e', function () {
             await shell.waitForPrompt();
 
             // Add the newly created log file
-            paths.push(path.join(customLogDir.path, `${shell.logId}_log`));
+            paths.push(
+              path.join(customLogDir.path, `${shell.logId as string}_log`)
+            );
             // Expect 6 files to be deleted and 5 to remain (including the new log file)
             expect(await existingFiles(paths)).equals('00000011111');
+            await shell.waitForPrompt();
+
+            // Add the newly created log to the file list.
+            paths.push(
+              path.join(customLogDir.path, `${shell.logId as string}_log`)
+            );
+
+            expect(
+              await shell.executeLine('config.get("logMaxFileCount")')
+            ).contains('5');
+
+            // 6 of the oldest log files were deleted and 1 created.
+            expect(await existingFiles(paths)).to.equal('00000011111');
           });
         });