1 files changed, 78 insertions, 0 deletions
diff --git a/src/utils/providers/theme-provider/theme-provider.test.tsx b/src/utils/providers/theme-provider/theme-provider.test.tsx
new file mode 100644
index 0000000..59a72cc
--- /dev/null
+++ b/src/utils/providers/theme-provider/theme-provider.test.tsx
@@ -0,0 +1,78 @@
+import { describe, expect, it } from '@jest/globals';
+import { render, screen as rtlScreen } from '@testing-library/react';
+import { type FC, useContext } from 'react';
+import { getThemeFromSystem } from '../../helpers';
+import { ThemeContext, ThemeProvider } from './theme-provider';
+
+const bodyPrefix = 'Current theme is:';
+
+const ComponentTest: FC = () => {
+  const { theme } = useContext(ThemeContext);
+
+  return (
+    <div>
+      {bodyPrefix} {theme}
+    </div>
+  );
+};
+
+describe('ThemeProvider', () => {
+  it('uses the default value when the provider is not used', () => {
+    const defaultValue = 'system';
+
+    render(<ComponentTest />);
+
+    expect(rtlScreen.getByText(new RegExp(bodyPrefix))).toHaveTextContent(
+      `${bodyPrefix} ${defaultValue}`
+    );
+  });
+
+  it('provides the given value to its children and set a matching attribute', () => {
+    const attribute = 'iure';
+    const theme = 'dark';
+
+    const { baseElement } = render(
+      <ThemeProvider
+        attribute={attribute}
+        defaultTheme={theme}
+        storageKey="dolores"
+      >
+        <ComponentTest />
+      </ThemeProvider>
+    );
+
+    expect(rtlScreen.getByText(new RegExp(bodyPrefix))).toHaveTextContent(
+      `${bodyPrefix} ${theme}`
+    );
+    expect(baseElement.parentElement?.getAttribute(`data-${attribute}`)).toBe(
+      theme
+    );
+    expect(baseElement.parentElement).toHaveStyle(`color-scheme: ${theme};`);
+  });
+
+  it('can resolve the preferred theme from user system settings', () => {
+    const attribute = 'qui';
+    const defaultTheme = 'system';
+    const resolvedTheme = getThemeFromSystem();
+
+    const { baseElement } = render(
+      <ThemeProvider
+        attribute={attribute}
+        defaultTheme={defaultTheme}
+        storageKey="modi"
+      >
+        <ComponentTest />
+      </ThemeProvider>
+    );
+
+    expect(rtlScreen.getByText(new RegExp(bodyPrefix))).toHaveTextContent(
+      `${bodyPrefix} ${defaultTheme}`
+    );
+    expect(baseElement.parentElement?.getAttribute(`data-${attribute}`)).toBe(
+      resolvedTheme
+    );
+    expect(baseElement.parentElement).toHaveStyle(
+      `color-scheme: ${resolvedTheme};`
+    );
+  });
+});