Implemented enum descriptor for number enums

src/utils/enum/descriptors/number-descriptor.ts

@@ -0,0 +1,41 @@
+import { EnumDescriptor } from "./enum-descriptor";
+
+/**
+ * This descriptor is used to describe a set of flags stored as a `number` value.
+ */
+export class NumberDescriptor implements EnumDescriptor<number> {
+    /**
+     * @inheritdoc
+     */
+    get name(): "number" {
+        return "number";
+    }
+
+    /**
+     * @inheritdoc
+     */
+    get defaultValue(): number {
+        return 0;
+    }
+
+    /**
+     * @inheritdoc
+     */
+    hasFlag(value: number, flag: number): boolean {
+        return (value & flag) === flag;
+    }
+
+    /**
+     * @inheritdoc
+     */
+    addFlag(value: number, flag: number): number {
+        return value | flag;
+    }
+
+    /**
+     * @inheritdoc
+     */
+    removeFlag(value: number, flag: number): number {
+        return value & ~flag;
+    }
+}

tests/unit/utils/enum/descriptors/number-descriptor.spec.ts

@@ -0,0 +1,47 @@
+import { NumberDescriptor } from "@/utils/enum/descriptors/number-descriptor";
+
+describe("NumberDescriptor", () => {
+    const descriptor = new NumberDescriptor();
+
+    describe("name", () => {
+        test("returns 'number' as name", () => {
+            expect(descriptor.name).toBe("number");
+        });
+    });
+
+    describe("defaultValue", () => {
+        test("returns 0 as default value", () => {
+            expect(descriptor.defaultValue).toBe(0);
+        });
+    });
+
+    describe("hasFlag", () => {
+        test("returns true if flag is set", () => {
+            expect(descriptor.hasFlag(3, 2)).toBe(true);
+        });
+
+        test("returns false if flag is not set", () => {
+            expect(descriptor.hasFlag(3, 4)).toBe(false);
+        });
+    });
+
+    describe("addFlag", () => {
+        test("adds flag to value", () => {
+            expect(descriptor.addFlag(1, 2)).toBe(3);
+        });
+
+        test("does not add flag if it is already set", () => {
+            expect(descriptor.addFlag(3, 2)).toBe(3);
+        });
+    });
+
+    describe("removeFlag", () => {
+        test("removes flag from value", () => {
+            expect(descriptor.removeFlag(3, 2)).toBe(1);
+        });
+
+        test("does not remove flag if it does not exist", () => {
+            expect(descriptor.removeFlag(1, 2)).toBe(1);
+        });
+    });
+});