add iterator and size getter

src/index.ts

@@ -173,6 +173,16 @@ export class IntegrityMetadataSet {
     }
   }
 
+  *[Symbol.iterator](): Generator<IntegrityMetadata> {
+    for (const integrityMetadata of this.#set) {
+      yield integrityMetadata;
+    }
+  }
+
+  get size(): number {
+    return this.#set.length;
+  }
+
   join(separator = " "): string {
     return this.#set.map(String).join(separator);
   }

test/integrity-metadata-set/iterator.js

@@ -0,0 +1,32 @@
+import assert from "node:assert";
+import { test } from "node:test";
+import { IntegrityMetadata, IntegrityMetadataSet } from "../../dist/index.js";
+
+test("correctly iterate over the set", function () {
+  const integrityMetadataSet = new IntegrityMetadataSet(`
+sha256-MV9b23bQeMQ7isAGTkoBZGErH853yGk0W/yUx1iU7dM=
+sha384-VbxVaw0v4Pzlgrpf4Huq//A1ZTY4x6wNVJTCpkwL6hzFczHHwSpFzbyn9MNKCJ7r
+sha512-wVJ82JPBJHc9gRkRlwyP5uhX1t9dySJr2KFgYUwM2WOk3eorlLt9NgIe+dhl1c6ilKgt1JoLsmn1H256V/eUIQ==
+`);
+
+  assert.deepEqual(
+    [...integrityMetadataSet],
+    [
+      new IntegrityMetadata(
+        "sha256-MV9b23bQeMQ7isAGTkoBZGErH853yGk0W/yUx1iU7dM=",
+      ),
+      new IntegrityMetadata(
+        "sha384-VbxVaw0v4Pzlgrpf4Huq//A1ZTY4x6wNVJTCpkwL6hzFczHHwSpFzbyn9MNKCJ7r",
+      ),
+      new IntegrityMetadata(
+        "sha512-wVJ82JPBJHc9gRkRlwyP5uhX1t9dySJr2KFgYUwM2WOk3eorlLt9NgIe+dhl1c6ilKgt1JoLsmn1H256V/eUIQ==",
+      ),
+    ],
+  );
+});
+
+test("if the empty set, return the empty set", function () {
+  const integrityMetadataSet = new IntegrityMetadataSet();
+
+  assert.deepEqual([...integrityMetadataSet], []);
+});

test/integrity-metadata-set/size.js

@@ -0,0 +1,19 @@
+import assert from "node:assert/strict";
+import { test } from "node:test";
+import { IntegrityMetadataSet } from "../../dist/index.js";
+
+test("return the correct size of the set", function () {
+  const integrityMetadataSet = new IntegrityMetadataSet(`
+sha256-MV9b23bQeMQ7isAGTkoBZGErH853yGk0W/yUx1iU7dM=
+sha384-VbxVaw0v4Pzlgrpf4Huq//A1ZTY4x6wNVJTCpkwL6hzFczHHwSpFzbyn9MNKCJ7r
+sha512-wVJ82JPBJHc9gRkRlwyP5uhX1t9dySJr2KFgYUwM2WOk3eorlLt9NgIe+dhl1c6ilKgt1JoLsmn1H256V/eUIQ==
+`);
+
+  assert.strictEqual(integrityMetadataSet.size, 3);
+});
+
+test("if the empty set, return 0", function () {
+  const integrityMetadataSet = new IntegrityMetadataSet();
+
+  assert.strictEqual(integrityMetadataSet.size, 0);
+});