Merge pull request #616 from remarkablemark/feat/local-storage

feat(assertions): add "Then I see local storage item"

cypress/e2e/cypress/example.feature

@@ -337,6 +337,8 @@ Feature: Cypress example
 
   Scenario: Local storage
     Given I visit "https://example.cypress.io/commands/storage"
+    When I click on button "Populate localStorage and sessionStorage"
+    Then I see local storage item "prop1"
     When I clear local storage
       And I clear local storage "key"
       And I clear all local storage

src/assertions/index.ts

@@ -7,6 +7,7 @@ export * from './hash';
 export * from './heading';
 export * from './label';
 export * from './link';
+export * from './local-storage';
 export * from './option';
 export * from './response';
 export * from './text';

src/assertions/local-storage.ts

@@ -0,0 +1,24 @@
+import { Then } from '@badeball/cypress-cucumber-preprocessor';
+
+/**
+ * Then I see local storage item:
+ *
+ * ```gherkin
+ * Then I see local storage item {string}
+ * ```
+ *
+ * Assert local storage item with key **_exists_**.
+ *
+ * @example
+ *
+ * ```gherkin
+ * Then I see local storage item "key"
+ * ```
+ */
+export function Then_I_see_local_storage_item(key: string) {
+  cy.wrap({}).should(() => {
+    expect(localStorage.getItem(key)).to.exist;
+  });
+}
+
+Then('I see local storage item {string}', Then_I_see_local_storage_item);