Add sample unit test

Author: andreaskienle

src/components/Helper/generateInitialsForEmail.spec.ts

@@ -0,0 +1,53 @@
+import { describe, it, expect } from 'vitest';
+import { generateInitialsForEmail } from './generateInitialsForEmail.ts';
+
+describe('generateInitialsForEmail', () => {
+  it('should generate initials from a standard email', () => {
+    expect(generateInitialsForEmail('[email protected]')).toBe('FL');
+  });
+
+  it('should generate initials from an email with a single-part name', () => {
+    expect(generateInitialsForEmail('[email protected]')).toBe('F');
+  });
+
+  it('should generate initials from an email with multiple name parts', () => {
+    expect(generateInitialsForEmail('[email protected]')).toBe(
+      'FML',
+    );
+  });
+
+  it('should truncate to 3 initials if more than 3 name parts exist', () => {
+    expect(
+      generateInitialsForEmail('[email protected]'),
+    ).toBe('FST');
+  });
+
+  it('should handle emails where the name part is short', () => {
+    expect(generateInitialsForEmail('[email protected]')).toBe('AB');
+    expect(generateInitialsForEmail('[email protected]')).toBe('X');
+  });
+
+  it('should convert initials to uppercase', () => {
+    expect(generateInitialsForEmail('[email protected]')).toBe('FL');
+    expect(generateInitialsForEmail('[email protected]')).toBe('FL');
+  });
+
+  it('should handle emails with numbers in the name part', () => {
+    expect(generateInitialsForEmail('[email protected]')).toBe('FL');
+    expect(generateInitialsForEmail('[email protected]')).toBe('12');
+  });
+
+  it('should handle emails with leading/trailing dots in the name part gracefully', () => {
+    expect(generateInitialsForEmail('[email protected]')).toBe('LD');
+    expect(generateInitialsForEmail('[email protected]')).toBe('TD');
+    expect(generateInitialsForEmail('[email protected]')).toBe('DD');
+  });
+
+  it('should return an empty string for undefined input', () => {
+    expect(generateInitialsForEmail(undefined)).toBe('');
+  });
+
+  it('should return an empty string for an empty string input', () => {
+    expect(generateInitialsForEmail('')).toBe('');
+  });
+});