fix(MongoBinaryDownloadUrl): use debian92 for versions <4.2.0

fixes #448

Author: hasezoey

packages/mongodb-memory-server-core/src/util/MongoBinaryDownloadUrl.ts

@@ -201,7 +201,14 @@ export class MongoBinaryDownloadUrl {
     const release: number = parseFloat(os.release);
 
     if (release >= 10 || ['unstable', 'testing'].includes(os.release)) {
-      name += '10';
+      if (semver.lte(this.version, '4.2.0')) {
+        log(
+          `getDebianVersionString: requested version "${this.version}" not available for osrelease "${release}", using "92"`
+        );
+        name += '92';
+      } else {
+        name += '10';
+      }
     } else if (release >= 9) {
       name += '92';
     } else if (release >= 8.1) {

packages/mongodb-memory-server-core/src/util/__tests__/MongoBinaryDownloadUrl.test.ts

@@ -98,20 +98,38 @@ describe('MongoBinaryDownloadUrl', () => {
         );
       });
 
-      it('for debian', async () => {
-        const du = new MongoBinaryDownloadUrl({
-          platform: 'linux',
-          arch: 'x64',
-          version: '3.6.3',
-          os: {
-            os: 'linux',
-            dist: 'debian',
-            release: '8.1',
-          },
+      describe('for debian', () => {
+        it('for debian 81 for 3.6.3', async () => {
+          const du = new MongoBinaryDownloadUrl({
+            platform: 'linux',
+            arch: 'x64',
+            version: '3.6.3',
+            os: {
+              os: 'linux',
+              dist: 'debian',
+              release: '8.1',
+            },
+          });
+          expect(await du.getDownloadUrl()).toBe(
+            'https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-debian81-3.6.3.tgz'
+          );
+        });
+
+        it('for debian 10 for 4.0.20 should use debian 92 [#448]', async () => {
+          const du = new MongoBinaryDownloadUrl({
+            platform: 'linux',
+            arch: 'x64',
+            version: '4.0.20',
+            os: {
+              os: 'linux',
+              dist: 'debian',
+              release: '10',
+            },
+          });
+          expect(await du.getDownloadUrl()).toBe(
+            'https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-debian92-4.0.20.tgz'
+          );
         });
-        expect(await du.getDownloadUrl()).toBe(
-          'https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-debian81-3.6.3.tgz'
-        );
       });
 
       it('fallback', async () => {