diff --git a/tests/contact.test.js b/tests/contact.test.js
new file mode 100644
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+++ b/tests/contact.test.js
@@ -0,0 +1,109 @@
+import test from "node:test";
+import assert from "node:assert/strict";
+import { readFileSync } from "node:fs";
+import { fileURLToPath } from "node:url";
+import { dirname, join } from "node:path";
+import {
+  MAILTO_TARGET,
+  buildContactMailto,
+  handleContactSubmit,
+  readFormValues,
+} from "../js/contact.js";
+
+const root = join(dirname(fileURLToPath(import.meta.url)), "..");
+const contactHtml = readFileSync(join(root, "contact.html"), "utf8");
+const indexHtml = readFileSync(join(root, "index.html"), "utf8");
+
+/** Minimal stand-in for a DOM form (has querySelectorAll("[name]")). */
+function fakeForm(values) {
+  return {
+    querySelectorAll(selector) {
+      assert.equal(selector, "[name]");
+      return Object.entries(values).map(([name, value]) => ({ name, value }));
+    },
+  };
+}
+
+// ---------------------------------------------------------------------------
+// Component tests: the contact page renders the three required fields
+// ---------------------------------------------------------------------------
+
+test("contact page renders a form with name, email, and message fields", () => {
+  assert.match(contactHtml, /<form[^>]*id="contact-form"/);
+  assert.match(contactHtml, /<input[^>]*type="text"[^>]*id="name"[^>]*name="name"/);
+  assert.match(contactHtml, /<input[^>]*type="email"[^>]*id="email"[^>]*name="email"/);
+  assert.match(contactHtml, /<textarea[^>]*id="message"[^>]*name="message"/);
+});
+
+test("all three contact form fields are required", () => {
+  assert.match(contactHtml, /<input[^>]*id="name"[^>]*required/);
+  assert.match(contactHtml, /<input[^>]*id="email"[^>]*required/);
+  assert.match(contactHtml, /<textarea[^>]*id="message"[^>]*required/);
+});
+
+test("contact page loads the module that wires form submission", () => {
+  assert.match(contactHtml, /<script[^>]*type="module"[^>]*src="js\/contact\.js"/);
+});
+
+// ---------------------------------------------------------------------------
+// Component tests: the page is linked from site navigation
+// ---------------------------------------------------------------------------
+
+test("home page nav links to the contact page", () => {
+  assert.match(indexHtml, /<a href="contact\.html">Contact<\/a>/);
+  assert.match(indexHtml, /class="nav-links"/);
+});
+
+test("contact page nav marks the contact link as the current page", () => {
+  assert.match(contactHtml, /<a href="contact\.html"[^>]*aria-current="page"[^>]*>Contact<\/a>/);
+});
+
+// ---------------------------------------------------------------------------
+// Unit tests: submitting the form opens the mail client pre-filled
+// ---------------------------------------------------------------------------
+
+test("buildContactMailto pre-fills subject and body from entered values", () => {
+  const url = buildContactMailto(
+    { name: "Ada Lovelace", email: "ada@example.com", message: "Hi there!" },
+    "owner@example.com"
+  );
+
+  assert.ok(url.startsWith("mailto:owner@example.com?"));
+
+  const params = new URL(url).searchParams;
+  assert.equal(params.get("subject"), "Contact form submission from Ada Lovelace");
+  assert.match(params.get("body"), /Name: Ada Lovelace/);
+  assert.match(params.get("body"), /Email: ada@example\.com/);
+  assert.match(params.get("body"), /Hi there!/);
+});
+
+test("buildContactMailto defaults to the configured mailto target", () => {
+  const url = buildContactMailto({ name: "A", email: "a@b.c", message: "m" });
+  assert.ok(url.startsWith(`mailto:${MAILTO_TARGET}?`));
+});
+
+test("readFormValues collects name, email, and message", () => {
+  const values = readFormValues(fakeForm({ name: "N", email: "E", message: "M" }));
+  assert.deepEqual(values, { name: "N", email: "E", message: "M" });
+});
+
+test("handleContactSubmit navigates the visitor to the built mailto URL", () => {
+  const form = fakeForm({
+    name: "Grace Hopper",
+    email: "grace@example.com",
+    message: "Hello!",
+  });
+  const navigated = [];
+
+  const url = handleContactSubmit(form, {
+    to: "owner@example.com",
+    navigate: (target) => navigated.push(target),
+  });
+
+  assert.equal(navigated.length, 1);
+  assert.ok(navigated[0].startsWith("mailto:owner@example.com?"));
+  assert.equal(navigated[0], url);
+
+  const params = new URL(navigated[0]).searchParams;
+  assert.match(params.get("body"), /Grace Hopper/);
+});