From 0bd31ad1e568b14a7f215af6002733e28dc0028a Mon Sep 17 00:00:00 2001
From: Samuel Muli <samuelmuli95@gmail.com>
Date: Tue, 27 Aug 2024 20:02:51 +0300
Subject: [PATCH] test: Add unit tests for Datepicker component

---
 .../framework/esm-styleguide/package.json     |  1 +
 .../src/datepicker/datepicker.test.tsx        | 81 +++++++++++++++++++
 2 files changed, 82 insertions(+)
 create mode 100644 packages/framework/esm-styleguide/src/datepicker/datepicker.test.tsx

diff --git a/packages/framework/esm-styleguide/package.json b/packages/framework/esm-styleguide/package.json
index 258fedcdd..0dc33117f 100644
--- a/packages/framework/esm-styleguide/package.json
+++ b/packages/framework/esm-styleguide/package.json
@@ -70,6 +70,7 @@
     "@openmrs/esm-translations": "workspace:*",
     "@types/geopattern": "^1.2.9",
     "autoprefixer": "^9.8.8",
+    "cross-env": "^7.0.3",
     "css-minimizer-webpack-plugin": "^1.2.0",
     "i18next": "^21.10.0",
     "jest": "^29.7.0",
diff --git a/packages/framework/esm-styleguide/src/datepicker/datepicker.test.tsx b/packages/framework/esm-styleguide/src/datepicker/datepicker.test.tsx
new file mode 100644
index 000000000..954f63b8b
--- /dev/null
+++ b/packages/framework/esm-styleguide/src/datepicker/datepicker.test.tsx
@@ -0,0 +1,81 @@
+import React from 'react';
+import { render, screen } from '@testing-library/react';
+import '@testing-library/jest-dom';
+import { OpenmrsDatePicker } from './index';
+import { type i18n as i18nType } from 'i18next';
+
+// Mocking the i18next object
+beforeAll(() => {
+  window.i18next = {
+    language: 'en',
+    changeLanguage: jest.fn(),
+    t: jest.fn((key) => key), // Simple mock for translation function
+    // Other properties and methods that might be required
+    init: jest.fn(),
+    getFixedT: jest.fn(),
+    exists: jest.fn(),
+    loadNamespaces: jest.fn(),
+    loadLanguages: jest.fn(),
+    use: jest.fn(),
+    on: jest.fn(),
+    off: jest.fn(),
+    dir: jest.fn(),
+    cloneInstance: jest.fn(),
+  } as unknown as i18nType; // Casting the mock to the correct i18n type
+});
+
+describe('OpenmrsDatePicker Component', () => {
+  // Test to ensure that the component renders without crashing
+  it('renders without crashing', () => {
+    render(<OpenmrsDatePicker />);
+    expect(screen.getByRole('group')).toBeInTheDocument();
+  });
+
+  // Test to verify the correct label is displayed when `labelText` prop is provided
+  it('displays the correct label when labelText is provided', () => {
+    render(<OpenmrsDatePicker labelText="Select Date" />);
+    expect(screen.getByText('Select Date')).toBeInTheDocument();
+  });
+
+  // Test to check if the component displays the correct default value
+  it('displays the correct default value', () => {
+    const { container } = render(<OpenmrsDatePicker defaultValue={new Date(2024, 7, 27)} />);
+    expect(container.querySelector('input')).toHaveValue('2024-08-27');
+  });
+
+  // Test to verify that the component does not crash when provided with an invalid date value
+  it('does not crash with invalid dates', () => {
+    render(<OpenmrsDatePicker value={null} />);
+    expect(screen.getByRole('group')).toBeInTheDocument();
+  });
+
+  // Test to check if the invalid text is displayed correctly when the `invalid` prop is true
+  it('it shows invalid text when the text is invalid', () => {
+    render(<OpenmrsDatePicker invalid={true} invalidText="Invalid Date" />);
+    expect(screen.getByText('Invalid Date')).toBeInTheDocument();
+  });
+
+  // Test to verify that an error is logged when both `onChange` and `onChangeRaw` props are provided
+  it('throws an error if both onChange and onChangeRaw are provided', () => {
+    const consoleErrorSpy = jest.spyOn(console, 'error').mockImplementation(() => {});
+    render(<OpenmrsDatePicker onChange={() => {}} onChangeRaw={() => {}} />);
+    expect(consoleErrorSpy).toHaveBeenCalledWith(
+      'An OpenmrsDatePicker component was created with both onChange and onChangeRaw handlers defined. Only onChangeRaw will be used.',
+    );
+
+    consoleErrorSpy.mockRestore();
+  });
+
+  // Test to ensure the component handles edge cases like `minDate` and `maxDate` correctly
+  it('handles edge cases gracefully', () => {
+    const { container } = render(<OpenmrsDatePicker minDate={new Date(2020, 0, 1)} maxDate={new Date(2020, 11, 31)} />);
+
+    const input = container.querySelector('input');
+
+    if (input?.hasAttribute('aria-invalid')) {
+      expect(input).toHaveAttribute('aria-invalid', 'false');
+    } else {
+      expect(input).not.toHaveAttribute('aria-invalid');
+    }
+  });
+});