fix(MongoBinaryDownloadUrl): use debian92 for versions <4.2.0

fixes #448

Author: hasezoey

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

@@ -173,7 +173,14 @@ export default class MongoBinaryDownloadUrl {
     let name = 'debian';
     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

@@ -64,7 +64,7 @@ describe('MongoBinaryDownloadUrl', () => {
       );
     });
 
-    it('for debian', async () => {
+    it('for debian 81 for 3.6.3', async () => {
       const du = new MongoBinaryDownloadUrl({
         platform: 'linux',
         arch: 'x64',
@@ -80,6 +80,22 @@ describe('MongoBinaryDownloadUrl', () => {
       );
     });
 
+    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'
+      );
+    });
+
     describe('for win32 & windows', () => {
       it('3.6 (win32)', async () => {
         const du = new MongoBinaryDownloadUrl({