diff --git a/test/test.browser.ts b/test/test.browser.ts
index 6a8f6b5..e531a43 100644
--- a/test/test.browser.ts
+++ b/test/test.browser.ts
@@ -5,8 +5,8 @@ let testWebstore: webstore.WebStore;
 
 tap.test('first test', async () => {
   testWebstore = new webstore.WebStore({
-    dbName: 'mytestdb',
-    storeName: 'myteststore'
+    dbName: 'mytest-db',
+    storeName: 'mytest-store'
   });
   expect(testWebstore).to.be.instanceOf(webstore.WebStore);
 });
@@ -22,4 +22,18 @@ tap.test('should store a value', async () => {
   console.log(JSON.stringify(await testWebstore.get('testProp1')));
 });
 
+tap.test('should overwrite a value', async () => {
+  await testWebstore.set('testProp1', {
+    wow: 'wowVal2'
+  });
+  console.log(JSON.stringify(await testWebstore.get('testProp1')));
+});
+
+tap.test('should correctly check the existence of keys', async () => {
+  const resultNotThere = await  testWebstore.check('notThere');
+  const resultThere = await testWebstore.check('testProp1');
+  expect(resultNotThere).to.be.false;
+  expect(resultThere).to.be.true;
+});
+
 tap.start();
diff --git a/ts/webstiore.classes.webstore.ts b/ts/webstiore.classes.webstore.ts
index e1a92c0..297e7b6 100644
--- a/ts/webstiore.classes.webstore.ts
+++ b/ts/webstiore.classes.webstore.ts
@@ -23,15 +23,20 @@ export class WebStore<T = any> {
     });
   }
 
-  async get(key) {
+  async get(key: string) {
     return this.db.get(this.options.storeName, key);
   }
 
-  async set(key, val) {
+  async check(keyArg: string): Promise<boolean> {
+    const result = await this.get(keyArg);
+    return !!result;
+  }
+
+  async set(key: string, val: T) {
     return this.db.put(this.options.storeName, val, key);
   }
 
-  async delete(key) {
+  async delete(key: string) {
     return this.db.delete(this.options.storeName, key);
   }