Add test for transforms

test/read_type.test.ts

@@ -199,6 +199,23 @@ describe('Enum', () => {
     test('number out', () => testing('4', Type.Enum(TestNumber), false))
     test('basic string', () => testing('a', Type.Enum(TestString), true, TestString.A))
     test('string out', () => testing('c', Type.Enum(TestString), false))
+    test('number with transform', async () => {
+        const scheme = Type.Transform(Type.String())
+            .Decode(value => {
+                value = value.toLowerCase()
+                if (value === 'a') return TestNumber.A
+                if (value === 'b') return TestNumber.B
+                if (value === 'c') return TestNumber.C
+                if (value === 'c') return TestNumber.D
+            })
+            .Encode(value => {
+                if (value === 0) return 'A'
+                if (value === 1) return 'B'
+                if (value === 2) return 'C'
+                return 'D'
+            })
+        await testing('A', scheme, true, TestNumber.A)
+    })
 })
 
 // Read specific types