test: migrations file

app/store/migrations.js

@@ -433,6 +433,8 @@ export const migrations = {
     }
     return state;
   },
+  // If you are implementing a migration it will break the migration tests,
+  // please write a unit for your specific migration version
 };
 
-export const version = 19;
+export const version = Object.keys(migrations).length - 1;

app/store/migrations.test.js

@@ -0,0 +1,20 @@
+import { migrations, version } from './migrations';
+
+describe('Redux Persist Migrations', () => {
+  it('should apply last migration version and return state', () => {
+    const oldState = {
+      recents: '0x1',
+    };
+
+    const migration = migrations[version];
+
+    const newState = migration(oldState);
+
+    expect(newState).toBeDefined();
+    expect(newState.recents).toBeUndefined();
+  });
+  it('should have all migrations up to the latest version', () => {
+    // Assert that the latest migration index matches the version constant
+    expect(Object.keys(migrations).length - 1).toBe(version);
+  });
+});