diff --git a/test/create-integrity-metadata.js b/test/create-integrity-metadata.js
new file mode 100644
index 0000000..bd2691e
--- /dev/null
+++ b/test/create-integrity-metadata.js
@@ -0,0 +1,23 @@
+import assert from "node:assert";
+import { test } from "node:test";
+import { createIntegrityMetadata, IntegrityMetadata } from "../dist/index.js";
+
+test("instantiate a new IntegrityMetadata", async function () {
+  const res = new Response("Hello, world!");
+  const data = await res.arrayBuffer();
+  const integrityMetadata = await createIntegrityMetadata("sha256", data);
+
+  assert(integrityMetadata instanceof IntegrityMetadata);
+});
+
+test("instantiate with the specified hash algorithm and ArrayBuffer", async function () {
+  const res = new Response("Hello, world!");
+  const data = await res.arrayBuffer();
+  const integrityMetadata = await createIntegrityMetadata("sha256", data);
+
+  assert.deepEqual(integrityMetadata, {
+    alg: "sha256",
+    val: "MV9b23bQeMQ7isAGTkoBZGErH853yGk0W/yUx1iU7dM=",
+    opt: [],
+  });
+});
diff --git a/test/get-prioritized-hash-algorithm.js b/test/get-prioritized-hash-algorithm.js
new file mode 100644
index 0000000..a09e2d7
--- /dev/null
+++ b/test/get-prioritized-hash-algorithm.js
@@ -0,0 +1,34 @@
+import assert from "node:assert/strict";
+import { test } from "node:test";
+import { getPrioritizedHashAlgorithm } from "../dist/index.js";
+
+test("return the most collision-resistant hash algorithm", function () {
+  assert.strictEqual(getPrioritizedHashAlgorithm("sha256", "sha512"), "sha512");
+});
+
+test("if the priority is equal, return the empty string", function () {
+  assert.strictEqual(getPrioritizedHashAlgorithm("sha256", "sha256"), "");
+});
+
+test("if both hash algorithms are not supported, return the empty string", function () {
+  assert.strictEqual(getPrioritizedHashAlgorithm("md5", "sha1"), "");
+});
+
+test.todo(
+  "if one of the hash algorithms is unsupported, return the supported hash algorithm",
+  function () {
+    assert.strictEqual(getPrioritizedHashAlgorithm("md5", "sha256"), "sha256");
+  },
+);
+
+test("if both strings are empty, return the empty string", function () {
+  assert.strictEqual(getPrioritizedHashAlgorithm("", ""), "");
+});
+
+test,
+  todo(
+    "if either is an empty string, it return the supported hash algorithm",
+    function () {
+      assert.strictEqual(getPrioritizedHashAlgorithm("sha256", ""), "sha256");
+    },
+  );
diff --git a/test/index.js b/test/index.js
deleted file mode 100644
index 278b302..0000000
--- a/test/index.js
+++ /dev/null
@@ -1,39 +0,0 @@
-import assert from "node:assert/strict";
-import { test } from "node:test";
-import {
-  createIntegrityMetadata,
-  createIntegrityMetadataSet,
-  IntegrityMetadataSet,
-} from "../dist/index.js";
-
-test("createIntegrityMetadata()", async function () {
-  const res = new Response("Hello, world!");
-  const data = await res.arrayBuffer();
-  const integrityMetadata = await createIntegrityMetadata("sha256", data);
-
-  assert.strictEqual(
-    integrityMetadata.toString(),
-    "sha256-MV9b23bQeMQ7isAGTkoBZGErH853yGk0W/yUx1iU7dM=",
-  );
-});
-
-test("createIntegrityMetadataSet()", async function () {
-  const res = new Response("Hello, world!");
-  const data = await res.arrayBuffer();
-  const sri = await createIntegrityMetadataSet(["sha384", "sha512"], data);
-
-  assert.strictEqual(
-    sri.toString(),
-    "sha384-VbxVaw0v4Pzlgrpf4Huq//A1ZTY4x6wNVJTCpkwL6hzFczHHwSpFzbyn9MNKCJ7r sha512-wVJ82JPBJHc9gRkRlwyP5uhX1t9dySJr2KFgYUwM2WOk3eorlLt9NgIe+dhl1c6ilKgt1JoLsmn1H256V/eUIQ==",
-  );
-});
-
-test("IntegrityMetadataSet.strongest", async function () {
-  const { strongest } = new IntegrityMetadataSet(`
-sha256-MV9b23bQeMQ7isAGTkoBZGErH853yGk0W/yUx1iU7dM=
-sha384-VbxVaw0v4Pzlgrpf4Huq//A1ZTY4x6wNVJTCpkwL6hzFczHHwSpFzbyn9MNKCJ7r
-sha512-wVJ82JPBJHc9gRkRlwyP5uhX1t9dySJr2KFgYUwM2WOk3eorlLt9NgIe+dhl1c6ilKgt1JoLsmn1H256V/eUIQ==
-`);
-
-  assert.strictEqual(strongest.alg, "sha512");
-});
diff --git a/test/integrity-metadata/constructor.js b/test/integrity-metadata/constructor.js
new file mode 100644
index 0000000..89d7dd8
--- /dev/null
+++ b/test/integrity-metadata/constructor.js
@@ -0,0 +1,112 @@
+import assert from "node:assert";
+import { test } from "node:test";
+import { IntegrityMetadata } from "../../dist/index.js";
+
+test("supports SHA-256", function () {
+  const integrityMetadata = new IntegrityMetadata(
+    "sha256-MV9b23bQeMQ7isAGTkoBZGErH853yGk0W/yUx1iU7dM=",
+  );
+
+  assert.deepEqual(integrityMetadata, {
+    alg: "sha256",
+    val: "MV9b23bQeMQ7isAGTkoBZGErH853yGk0W/yUx1iU7dM=",
+    opt: [],
+  });
+});
+
+test("supports SHA-384", function () {
+  const integrityMetadata = new IntegrityMetadata(
+    "sha384-VbxVaw0v4Pzlgrpf4Huq//A1ZTY4x6wNVJTCpkwL6hzFczHHwSpFzbyn9MNKCJ7r",
+  );
+
+  assert.deepEqual(integrityMetadata, {
+    alg: "sha384",
+    val: "VbxVaw0v4Pzlgrpf4Huq//A1ZTY4x6wNVJTCpkwL6hzFczHHwSpFzbyn9MNKCJ7r",
+    opt: [],
+  });
+});
+
+test("supports SHA-512", function () {
+  const integrityMetadata = new IntegrityMetadata(
+    "sha512-wVJ82JPBJHc9gRkRlwyP5uhX1t9dySJr2KFgYUwM2WOk3eorlLt9NgIe+dhl1c6ilKgt1JoLsmn1H256V/eUIQ==",
+  );
+
+  assert.deepEqual(integrityMetadata, {
+    alg: "sha512",
+    val: "wVJ82JPBJHc9gRkRlwyP5uhX1t9dySJr2KFgYUwM2WOk3eorlLt9NgIe+dhl1c6ilKgt1JoLsmn1H256V/eUIQ==",
+    opt: [],
+  });
+});
+
+test.todo("accepts options", function () {
+  const integrityMetadata = new IntegrityMetadata(
+    "sha256-MV9b23bQeMQ7isAGTkoBZGErH853yGk0W/yUx1iU7dM=?foo?bar",
+  );
+
+  assert.deepEqual(integrityMetadata, {
+    alg: "sha256",
+    val: "MV9b23bQeMQ7isAGTkoBZGErH853yGk0W/yUx1iU7dM=",
+    opt: ["foo", "bar"],
+  });
+});
+
+test.todo("accepts an IntegrityMetadata like object as input", function () {
+  const integrityMetadata = new IntegrityMetadata({
+    alg: "sha256",
+    val: "MV9b23bQeMQ7isAGTkoBZGErH853yGk0W/yUx1iU7dM=",
+  });
+
+  assert.deepEqual(
+    integrityMetadata,
+    new IntegrityMetadata(
+      "sha256-MV9b23bQeMQ7isAGTkoBZGErH853yGk0W/yUx1iU7dM=",
+    ),
+  );
+});
+
+test.todo("trims leading and trailing whitespace", function () {
+  const integrityMetadata = new IntegrityMetadata(
+    "\t  sha256-MV9b23bQeMQ7isAGTkoBZGErH853yGk0W/yUx1iU7dM=\u0020\u00a0\u1680\u180e\u2000\u2001\u2002\u3000",
+  );
+
+  assert.deepEqual(
+    integrityMetadata,
+    new IntegrityMetadata(
+      "sha256-MV9b23bQeMQ7isAGTkoBZGErH853yGk0W/yUx1iU7dM=",
+    ),
+  );
+});
+
+test("discards unsupported hash algorithm", function () {
+  const integrityMetadata = new IntegrityMetadata(
+    "sha1-lDpwLQbzRZmu4fjajvn3KWAx1pk=",
+  );
+
+  assert.deepEqual(integrityMetadata, new IntegrityMetadata());
+});
+
+test("discards null input", function () {
+  const integrityMetadata = new IntegrityMetadata(null);
+
+  assert.deepEqual(integrityMetadata, new IntegrityMetadata());
+});
+
+test("discards empty string input", function () {
+  const integrityMetadata = new IntegrityMetadata("");
+
+  assert.deepEqual(integrityMetadata, new IntegrityMetadata());
+});
+
+test("discards invalid value", function () {
+  const integrityMetadata = new IntegrityMetadata("md5\0/..invalid-value");
+
+  assert.deepEqual(integrityMetadata, new IntegrityMetadata());
+});
+
+test("discards invalid values in a list of multiple inputs", function () {
+  const integrityMetadata = new IntegrityMetadata(
+    "sha1-lDpwLQbzRZmu4fjajvn3KWAx1pk= md5\0/..invalid-value",
+  );
+
+  assert.deepEqual(integrityMetadata, new IntegrityMetadata());
+});
diff --git a/test/integrity-metadata/match.js b/test/integrity-metadata/match.js
new file mode 100644
index 0000000..de6ceb5
--- /dev/null
+++ b/test/integrity-metadata/match.js
@@ -0,0 +1,82 @@
+import assert from "node:assert/strict";
+import { test } from "node:test";
+import { IntegrityMetadata } from "../../dist/index.js";
+
+test("if the hash values match, return true", function () {
+  const integrityMetadata = new IntegrityMetadata(
+    "sha256-MV9b23bQeMQ7isAGTkoBZGErH853yGk0W/yUx1iU7dM=",
+  );
+
+  assert.strictEqual(
+    integrityMetadata.match({
+      alg: "sha256",
+      val: "MV9b23bQeMQ7isAGTkoBZGErH853yGk0W/yUx1iU7dM=",
+    }),
+    true,
+  );
+});
+
+test("if the hash algorithms are different, return false", function () {
+  const integrityMetadata = new IntegrityMetadata(
+    "sha256-MV9b23bQeMQ7isAGTkoBZGErH853yGk0W/yUx1iU7dM=",
+  );
+
+  assert.strictEqual(
+    integrityMetadata.match({
+      alg: "sha512",
+      val: "MJ7MSJwS1utMxA9QyQLytNDtd+5RGnx6m808qG1M2G+YndNbxf9JlnDaNCVbRbDP2DDoH2Bdz33FVC6TrpzXbw==",
+    }),
+    false,
+  );
+});
+
+test("if the hash values are different, return false", function () {
+  const integrityMetadata = new IntegrityMetadata(
+    "sha256-MV9b23bQeMQ7isAGTkoBZGErH853yGk0W/yUx1iU7dM=",
+  );
+
+  assert.strictEqual(
+    integrityMetadata.match({
+      alg: "sha256",
+      val: "uU0nuZNNPgilLlLX2n2r+sSE7+N6U4DukIj3rOLvzek=",
+    }),
+    false,
+  );
+});
+
+test.todo("if the hash algorithm is unsupported, return false", function () {
+  const integrityMetadata = new IntegrityMetadata(
+    "sha1-lDpwLQbzRZmu4fjajvn3KWAx1pk=",
+  );
+
+  assert.strictEqual(
+    integrityMetadata.match(
+      new IntegrityMetadata("sha1-lDpwLQbzRZmu4fjajvn3KWAx1pk="),
+    ),
+    false,
+  );
+});
+
+test.todo("if null, return false", function () {
+  const integrityMetadata = new IntegrityMetadata(null);
+
+  assert.strictEqual(
+    integrityMetadata.match(new IntegrityMetadata(null)),
+    false,
+  );
+});
+
+test.todo("if empty, return false", function () {
+  const integrityMetadata = new IntegrityMetadata("");
+
+  assert.strictEqual(integrityMetadata.match(new IntegrityMetadata("")), false);
+});
+
+test.todo("if invalid value, return false", function () {
+  const integrityMetadata = new IntegrityMetadata("md5\0/..invalid-value");
+
+  assert.strictEqual(
+    integrityMetadata.match(new IntegrityMetadata("md5\0/..invalid-value")),
+    false,
+  );
+});
diff --git a/test/integrity-metadata/stringify.js b/test/integrity-metadata/stringify.js
new file mode 100644
index 0000000..26d5ca4
--- /dev/null
+++ b/test/integrity-metadata/stringify.js
@@ -0,0 +1,15 @@
+import assert from "node:assert/strict";
+import { test } from "node:test";
+import { IntegrityMetadata } from "../../dist/index.js";
+
+test("IntegrityMetadata like object can be serialized", function () {
+  const integrityMetadataLike = {
+    alg: "sha256",
+    val: "MV9b23bQeMQ7isAGTkoBZGErH853yGk0W/yUx1iU7dM=",
+  };
+
+  assert.strictEqual(
+    IntegrityMetadata.stringify(integrityMetadataLike),
+    "sha256-MV9b23bQeMQ7isAGTkoBZGErH853yGk0W/yUx1iU7dM=",
+  );
+});
diff --git a/test/integrity-metadata/to-json.js b/test/integrity-metadata/to-json.js
new file mode 100644
index 0000000..bfa166d
--- /dev/null
+++ b/test/integrity-metadata/to-json.js
@@ -0,0 +1,14 @@
+import assert from "node:assert/strict";
+import { test } from "node:test";
+import { IntegrityMetadata } from "../../dist/index.js";
+
+test("toJSON() can be used", function () {
+  const integrityMetadata = new IntegrityMetadata(
+    "sha256-MV9b23bQeMQ7isAGTkoBZGErH853yGk0W/yUx1iU7dM=",
+  );
+
+  assert.strictEqual(
+    integrityMetadata.toJSON(),
+    "sha256-MV9b23bQeMQ7isAGTkoBZGErH853yGk0W/yUx1iU7dM=",
+  );
+});
diff --git a/test/integrity-metadata/to-string.js b/test/integrity-metadata/to-string.js
new file mode 100644
index 0000000..68bbaf8
--- /dev/null
+++ b/test/integrity-metadata/to-string.js
@@ -0,0 +1,14 @@
+import assert from "node:assert/strict";
+import { test } from "node:test";
+import { IntegrityMetadata } from "../../dist/index.js";
+
+test("toString() can be used", function () {
+  const integrityMetadata = new IntegrityMetadata(
+    "sha256-MV9b23bQeMQ7isAGTkoBZGErH853yGk0W/yUx1iU7dM=",
+  );
+
+  assert.strictEqual(
+    integrityMetadata.toString(),
+    "sha256-MV9b23bQeMQ7isAGTkoBZGErH853yGk0W/yUx1iU7dM=",
+  );
+});