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__tests__/lib/utils/conversions.test.ts

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+import {
+  fahrenheitToCelsius,
+  celsiusToFahrenheit,
+  convertTemperature,
+  formatTemperature,
+} from '../../../src/lib/utils/conversions';
+
+describe('Temperature Conversions', () => {
+  describe('fahrenheitToCelsius', () => {
+    it('converts 32°F to 0°C', () => {
+      expect(fahrenheitToCelsius(32)).toBe(0);
+    });
+
+    it('converts 212°F to 100°C', () => {
+      expect(fahrenheitToCelsius(212)).toBe(100);
+    });
+
+    it('converts 2232°F (cone 6) to approximately 1222°C', () => {
+      const result = fahrenheitToCelsius(2232);
+      expect(Math.round(result)).toBe(1222);
+    });
+  });
+
+  describe('celsiusToFahrenheit', () => {
+    it('converts 0°C to 32°F', () => {
+      expect(celsiusToFahrenheit(0)).toBe(32);
+    });
+
+    it('converts 100°C to 212°F', () => {
+      expect(celsiusToFahrenheit(100)).toBe(212);
+    });
+  });
+
+  describe('convertTemperature', () => {
+    it('returns same temperature if units match', () => {
+      const temp = { value: 100, unit: 'F' as const };
+      const result = convertTemperature(temp, 'F');
+      expect(result).toEqual(temp);
+    });
+
+    it('converts from F to C', () => {
+      const temp = { value: 2232, unit: 'F' as const };
+      const result = convertTemperature(temp, 'C');
+      expect(result.value).toBe(1222);
+      expect(result.unit).toBe('C');
+    });
+
+    it('converts from C to F', () => {
+      const temp = { value: 1222, unit: 'C' as const };
+      const result = convertTemperature(temp, 'F');
+      expect(result.value).toBe(2232);
+      expect(result.unit).toBe('F');
+    });
+  });
+
+  describe('formatTemperature', () => {
+    it('formats Fahrenheit temperature', () => {
+      const temp = { value: 2232, unit: 'F' as const };
+      expect(formatTemperature(temp)).toBe('2232°F');
+    });
+
+    it('formats Celsius temperature', () => {
+      const temp = { value: 1222, unit: 'C' as const };
+      expect(formatTemperature(temp)).toBe('1222°C');
+    });
+  });
+});