Add tests for SQLJSPackageDB (#33)

* Add tests for SQLJSPackageDB

Test the save, find, stats, and clear class methods. No tests are added
for the logging methods.

Minor styling changes in some other files, as applied by prettier.

* Make test for SQLJSPackageDB.findResourceInfo stricter

Check properties of the returned resource to make sure it matches one of
the expected results.

Remove unneeded comment from saveResourceInfo test.

* Expect last added resource from findResourceInfo

src/db/SQLJSPackageDB.ts

@@ -277,6 +277,9 @@ export class SQLJSPackageDB implements PackageDB {
       if (result.sdCharacteristics) {
         result.sdCharacteristics = JSON.parse(result.sdCharacteristics);
       }
+      if (result.sdAbstract != null) {
+        result.sdAbstract = result.sdAbstract ? true : false;
+      }
       results.push(result as ResourceInfo);
     }
     stmt.free();