Initial release

test/parser.test.ts

@@ -0,0 +1,89 @@
+import { describe, it, expect } from 'vitest';
+import {
+  base91ToNumber,
+  knotsToKmh,
+  kmhToKnots,
+  feetToMeters,
+  metersToFeet,
+  celsiusToFahrenheit,
+  fahrenheitToCelsius,
+} from '../src/parser';
+
+describe('parser utilities', () => {
+  describe('base91ToNumber', () => {
+    it('decodes all-! to 0', () => {
+      expect(base91ToNumber('!!!!')).toBe(0);
+    });
+
+    it('decodes single character correctly', () => {
+      // 'A' === 65, digit = 65 - 33 = 32
+      expect(base91ToNumber('A')).toBe(32);
+    });
+
+    it('should decode multiple Base91 characters', () => {
+      // "!!" = 0 * 91 + 0 = 0
+      expect(base91ToNumber('!!')).toBe(0);
+
+      // "!#" = 0 * 91 + 2 = 2
+      expect(base91ToNumber('!#')).toBe(2);
+
+      // "#!" = 2 * 91 + 0 = 182
+      expect(base91ToNumber('#!')).toBe(182);
+
+      // "##" = 2 * 91 + 2 = 184
+      expect(base91ToNumber('##')).toBe(184);
+    });
+
+    it('should decode 4-character Base91 strings (used in APRS)', () => {
+      // Test with printable ASCII Base91 characters (33-123)
+      const testValue = base91ToNumber('!#%\'');
+      expect(testValue).toBeGreaterThan(0);
+      expect(testValue).toBeLessThan(91 * 91 * 91 * 91);
+    });
+
+    it('should decode maximum valid Base91 value', () => {
+      // Maximum is '{' (ASCII 123, digit 90) repeated
+      const maxValue = base91ToNumber('{{{{');
+      const expected = 90 * 91 * 91 * 91 + 90 * 91 * 91 + 90 * 91 + 90;
+      expect(maxValue).toBe(expected);
+    });
+
+    it('should handle APRS compressed position example', () => {
+      // Using actual characters from APRS test vector
+      const latStr = '/:*E';
+      const lonStr = 'qZ=O';
+
+      const latValue = base91ToNumber(latStr);
+      const lonValue = base91ToNumber(lonStr);
+
+      // Just verify they decode without error and produce valid numbers
+      expect(typeof latValue).toBe('number');
+      expect(typeof lonValue).toBe('number');
+      expect(latValue).toBeGreaterThanOrEqual(0);
+      expect(lonValue).toBeGreaterThanOrEqual(0);
+    });
+
+    it('throws on invalid character', () => {
+      expect(() => base91ToNumber(' ')).toThrow(); // space (code 32) is invalid
+    });
+  });
+
+  describe('unit conversions', () => {
+    it('converts knots <-> km/h', () => {
+      expect(knotsToKmh(10)).toBeCloseTo(18.52, 5);
+      expect(kmhToKnots(18.52)).toBeCloseTo(10, 3);
+    });
+
+    it('converts feet <-> meters', () => {
+      expect(feetToMeters(10)).toBeCloseTo(3.048, 6);
+      expect(metersToFeet(3.048)).toBeCloseTo(10, 6);
+    });
+
+    it('converts celsius <-> fahrenheit', () => {
+      expect(celsiusToFahrenheit(0)).toBeCloseTo(32, 6);
+      expect(fahrenheitToCelsius(32)).toBeCloseTo(0, 6);
+      expect(celsiusToFahrenheit(100)).toBeCloseTo(212, 6);
+      expect(fahrenheitToCelsius(212)).toBeCloseTo(100, 6);
+    });
+  });
+});