copied set implementations from MultiFlag JS

node/tests/flagsets/number.test.ts

@@ -0,0 +1,62 @@
+import { BitFlagSet } from '~'
+
+describe(BitFlagSet, () => {
+    test('none', () => {
+        const flags = new BitFlagSet()
+
+        expect(flags.none()).toEqual(0)
+    })
+
+    test('union', () => {
+        const flags = new BitFlagSet()
+
+        expect(flags.union(0, 0)).toEqual(0)
+        expect(flags.union(1, 0)).toEqual(1)
+        expect(flags.union(0, 2)).toEqual(2)
+        expect(flags.union(1, 2)).toEqual(3)
+        expect(flags.union(3, 6)).toEqual(7)
+    })
+
+    test('difference', () => {
+        const flags = new BitFlagSet()
+
+        expect(flags.difference(0, 0)).toEqual(0)
+        expect(flags.difference(1, 0)).toEqual(1)
+        expect(flags.difference(3, 6)).toEqual(1)
+        expect(flags.difference(6, 3)).toEqual(4)
+        expect(flags.difference(8, 17)).toEqual(8)
+    })
+
+    test('intersection', () => {
+        const flags = new BitFlagSet()
+
+        expect(flags.intersection(0, 0)).toEqual(0)
+        expect(flags.intersection(1, 0)).toEqual(0)
+        expect(flags.intersection(1, 2)).toEqual(0)
+        expect(flags.intersection(1, 3)).toEqual(1)
+        expect(flags.intersection(11, 5)).toEqual(1)
+        expect(flags.intersection(11, 7)).toEqual(3)
+    })
+
+    test('isSuperset', () => {
+        const flags = new BitFlagSet()
+
+        expect(flags.isSuperset(0, 0)).toBe(true)
+        expect(flags.isSuperset(3, 0)).toBe(true)
+        expect(flags.isSuperset(3, 1)).toBe(true)
+        expect(flags.isSuperset(3, 3)).toBe(true)
+        expect(flags.isSuperset(0, 3)).toBe(false)
+        expect(flags.isSuperset(8, 4)).toBe(false)
+    })
+
+    test('enumerate', () => {
+        const flags = new BitFlagSet()
+
+        expect([...flags.enumerate(0)]).toEqual([])
+        expect([...flags.enumerate(1)]).toEqual([1])
+        expect([...flags.enumerate(2)]).toEqual([2])
+        expect([...flags.enumerate(3)]).toEqual([1, 2])
+        expect([...flags.enumerate(11)]).toEqual([1, 2, 8])
+        expect([...flags.enumerate(100)]).toEqual([4, 32, 64])
+    })
+})