test: Improve coverage for Saxon Scales.

Author: marinojoey

src/scales/__tests__/saxon.ts

@@ -0,0 +1,43 @@
+import { Saxon as SaxonScale } from '../../scales'
+
+describe('SAXON', () => {
+  describe('valid grade formats', () => {
+    let consoleWarnSpy
+
+    beforeEach(() => {
+      consoleWarnSpy = jest.spyOn(console, 'warn').mockImplementation()
+    })
+
+    afterEach(() => {
+      consoleWarnSpy.mockRestore()
+    })
+
+    test('should handle valid grade format "1"', () => {
+      const score = SaxonScale.getScore('1')
+      expect(console.warn).not.toHaveBeenCalled()
+      expect(score).not.toEqual(-1)
+    })
+  })
+
+  describe('isType', () => {
+    test('should return true for valid grade format "7a"', () => {
+      const isValid = SaxonScale.isType('7a')
+      expect(isValid).toBe(true)
+    })
+
+    test('should return true for valid grade format "1"', () => {
+      const isValid = SaxonScale.isType('1')
+      expect(isValid).toBe(true)
+    })
+
+    test('should return false for invalid grade format "V"', () => {
+      const isValid = SaxonScale.isType('V')
+      expect(isValid).toBe(false)
+    })
+
+    test('should return false for invalid grade format "8d"', () => {
+      const isValid = SaxonScale.isType('8d')
+      expect(isValid).toBe(false)
+    })
+  })
+})