diff --git a/package-lock.json b/package-lock.json
index bfc3ad77..d01288c1 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -17,7 +17,11 @@
         "qr-creator": "^1.0.0"
       },
       "devDependencies": {
+        "@open-wc/testing": "^2.5.33",
         "@types/color": "^3.0.1",
+        "@web/dev-server-esbuild": "^0.2.12",
+        "@web/test-runner": "^0.13.5",
+        "@web/test-runner-puppeteer": "^0.10.0",
         "bluebird": "^3.7.2",
         "bootstrap-icons": "^1.4.1",
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@@ -38,6 +42,7 @@
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         "recursive-copy": "^2.0.11",
         "sass": "^1.32.7",
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         "typedoc": "^0.20.28",
         "typescript": "^4.2.4",
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+      "resolved": "https://registry.npmjs.org/@mdn/browser-compat-data/-/browser-compat-data-3.3.5.tgz",
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+      "dev": true
+    },
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       "resolved": "https://registry.npmjs.org/@nodelib/fs.scandir/-/fs.scandir-2.1.4.tgz",
@@ -176,11 +187,147 @@
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+      "resolved": "https://registry.npmjs.org/@open-wc/chai-dom-equals/-/chai-dom-equals-0.12.36.tgz",
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+      }
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+    "node_modules/@open-wc/chai-dom-equals/node_modules/@open-wc/semantic-dom-diff": {
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+      "resolved": "https://registry.npmjs.org/@open-wc/semantic-dom-diff/-/semantic-dom-diff-0.13.21.tgz",
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+      "dev": true
+    },
+    "node_modules/@open-wc/dedupe-mixin": {
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/@open-wc/dedupe-mixin/-/dedupe-mixin-1.3.0.tgz",
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+      "dev": true
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+    "node_modules/@open-wc/scoped-elements": {
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+      "dev": true
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+      "resolved": "https://registry.npmjs.org/@types/mocha/-/mocha-5.2.7.tgz",
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+      "dev": true
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     "node_modules/@popperjs/core": {
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+    "node_modules/@rollup/plugin-node-resolve": {
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+        "@types/resolve": "1.17.1",
+        "builtin-modules": "^3.1.0",
+        "deepmerge": "^4.2.2",
+        "is-module": "^1.0.0",
+        "resolve": "^1.19.0"
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+      "engines": {
+        "node": ">= 10.0.0"
+      },
+      "peerDependencies": {
+        "rollup": "^1.20.0||^2.0.0"
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+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/@rollup/pluginutils/-/pluginutils-3.1.0.tgz",
+      "integrity": "sha512-GksZ6pr6TpIjHm8h9lSQ8pi8BE9VeubNT0OMJ3B5uZJ8pz73NPiqOtCog/x2/QzM1ENChPKxMDhiQuRHsqc+lg==",
+      "dev": true,
+      "dependencies": {
+        "@types/estree": "0.0.39",
+        "estree-walker": "^1.0.1",
+        "picomatch": "^2.2.2"
+      },
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+      },
+      "peerDependencies": {
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     "node_modules/@shoelace-style/animations": {
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@@ -216,6 +363,85 @@
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+      "resolved": "https://registry.npmjs.org/@sinonjs/commons/-/commons-1.8.3.tgz",
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+      "dev": true,
+      "dependencies": {
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+      }
+    },
+    "node_modules/@sinonjs/fake-timers": {
+      "version": "7.1.1",
+      "resolved": "https://registry.npmjs.org/@sinonjs/fake-timers/-/fake-timers-7.1.1.tgz",
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+      "dev": true,
+      "dependencies": {
+        "@sinonjs/commons": "^1.7.0"
+      }
+    },
+    "node_modules/@sinonjs/samsam": {
+      "version": "6.0.2",
+      "resolved": "https://registry.npmjs.org/@sinonjs/samsam/-/samsam-6.0.2.tgz",
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+      "dependencies": {
+        "@sinonjs/commons": "^1.6.0",
+        "lodash.get": "^4.4.2",
+        "type-detect": "^4.0.8"
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+    "node_modules/@sinonjs/text-encoding": {
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+      "dev": true
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+      "resolved": "https://registry.npmjs.org/@types/chai-dom/-/chai-dom-0.0.9.tgz",
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+      "dev": true,
+      "dependencies": {
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+      "resolved": "https://registry.npmjs.org/@types/co-body/-/co-body-5.1.0.tgz",
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+      "version": "3.4.34",
+      "resolved": "https://registry.npmjs.org/@types/connect/-/connect-3.4.34.tgz",
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+      "dev": true,
+      "dependencies": {
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+      }
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+      "resolved": "https://registry.npmjs.org/@types/content-disposition/-/content-disposition-0.5.3.tgz",
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+        "@types/express": "*",
+        "@types/keygrip": "*",
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+      "dependencies": {
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+        "@types/qs": "*",
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@@ -250,12 +550,91 @@
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     },
+    "ylru": {
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/ylru/-/ylru-1.2.1.tgz",
+      "integrity": "sha512-faQrqNMzcPCHGVC2aaOINk13K+aaBDUPjGWl0teOXywElLjyVAB6Oe2jj62jHYtwsU49jXhScYbvPENK+6zAvQ==",
+      "dev": true
+    },
     "yocto-queue": {
       "version": "0.1.0",
       "resolved": "https://registry.npmjs.org/yocto-queue/-/yocto-queue-0.1.0.tgz",
diff --git a/package.json b/package.json
index cc6bd52b..142a8b8d 100644
--- a/package.json
+++ b/package.json
@@ -33,7 +33,9 @@
     "build": "node scripts/build.cjs",
     "prepublishOnly": "npm run build",
     "prettier": "prettier --write --loglevel warn .",
-    "create": "node scripts/create-component.cjs"
+    "create": "node scripts/create-component.cjs",
+    "test": "web-test-runner \"src/**/*.test.ts\" --node-resolve --puppeteer",
+    "test:watch": "web-test-runner \"src/**/*.test.ts\" --node-resolve --puppeteer --watch"
   },
   "dependencies": {
     "@popperjs/core": "^2.7.0",
@@ -44,7 +46,11 @@
     "qr-creator": "^1.0.0"
   },
   "devDependencies": {
+    "@open-wc/testing": "^2.5.33",
     "@types/color": "^3.0.1",
+    "@web/dev-server-esbuild": "^0.2.12",
+    "@web/test-runner": "^0.13.5",
+    "@web/test-runner-puppeteer": "^0.10.0",
     "bluebird": "^3.7.2",
     "bootstrap-icons": "^1.4.1",
     "browser-sync": "^2.26.14",
@@ -65,6 +71,7 @@
     "prettier": "^2.2.1",
     "recursive-copy": "^2.0.11",
     "sass": "^1.32.7",
+    "sinon": "^11.1.1",
     "tslib": "^2.2.0",
     "typedoc": "^0.20.28",
     "typescript": "^4.2.4",
diff --git a/src/components/alert/alert.test.ts b/src/components/alert/alert.test.ts
new file mode 100644
index 00000000..a6e87f1b
--- /dev/null
+++ b/src/components/alert/alert.test.ts
@@ -0,0 +1,93 @@
+import { expect, fixture, html, waitUntil } from '@open-wc/testing';
+import sinon from 'sinon';
+
+import '../../../dist/shoelace.js';
+import type SlAlert from './alert';
+
+describe('<sl-alert>', () => {
+  it('should be visible with the open attribute', async () => {
+    const el = await fixture(html` <sl-alert open>I am an alert</sl-alert> `);
+    const base = el.shadowRoot?.querySelector('[part="base"]') as HTMLElement;
+
+    expect(base.hidden).to.be.false;
+  });
+
+  it('should not be visible without the open attribute', async () => {
+    const el = await fixture(html` <sl-alert open>I am an alert</sl-alert> `);
+    const base = el.shadowRoot?.querySelector('[part="base"]') as HTMLElement;
+
+    expect(base.hidden).to.be.false;
+  });
+
+  it('should emit sl-show and sl-after-show when calling show()', async () => {
+    const el = (await fixture(html` <sl-alert>I am an alert</sl-alert> `)) as SlAlert;
+    const base = el.shadowRoot?.querySelector('[part="base"]') as HTMLElement;
+    const showHandler = sinon.spy();
+    const afterShowHandler = sinon.spy();
+
+    el.addEventListener('sl-show', showHandler);
+    el.addEventListener('sl-after-show', afterShowHandler);
+    el.show();
+
+    await waitUntil(() => showHandler.calledOnce);
+    await waitUntil(() => afterShowHandler.calledOnce);
+
+    expect(showHandler).to.have.been.calledOnce;
+    expect(afterShowHandler).to.have.been.calledOnce;
+    expect(base.hidden).to.be.false;
+  });
+
+  it('should emit sl-hide and sl-after-hide when calling hide()', async () => {
+    const el = (await fixture(html` <sl-alert open>I am an alert</sl-alert> `)) as SlAlert;
+    const base = el.shadowRoot?.querySelector('[part="base"]') as HTMLElement;
+    const hideHandler = sinon.spy();
+    const afterHideHandler = sinon.spy();
+
+    el.addEventListener('sl-hide', hideHandler);
+    el.addEventListener('sl-after-hide', afterHideHandler);
+    el.hide();
+
+    await waitUntil(() => hideHandler.calledOnce);
+    await waitUntil(() => afterHideHandler.calledOnce);
+
+    expect(hideHandler).to.have.been.calledOnce;
+    expect(afterHideHandler).to.have.been.calledOnce;
+    expect(base.hidden).to.be.true;
+  });
+
+  it('should emit sl-show and sl-after-show when adding the open attribute', async () => {
+    const el = (await fixture(html` <sl-alert>I am an alert</sl-alert> `)) as SlAlert;
+    const base = el.shadowRoot?.querySelector('[part="base"]') as HTMLElement;
+    const showHandler = sinon.spy();
+    const afterShowHandler = sinon.spy();
+
+    el.addEventListener('sl-show', showHandler);
+    el.addEventListener('sl-after-show', afterShowHandler);
+    el.open = true;
+
+    await waitUntil(() => showHandler.calledOnce);
+    await waitUntil(() => afterShowHandler.calledOnce);
+
+    expect(showHandler).to.have.been.calledOnce;
+    expect(afterShowHandler).to.have.been.calledOnce;
+    expect(base.hidden).to.be.false;
+  });
+
+  it('should emit sl-hide and sl-after-hide when removing the open attribute', async () => {
+    const el = (await fixture(html` <sl-alert open>I am an alert</sl-alert> `)) as SlAlert;
+    const base = el.shadowRoot?.querySelector('[part="base"]') as HTMLElement;
+    const hideHandler = sinon.spy();
+    const afterHideHandler = sinon.spy();
+
+    el.addEventListener('sl-hide', hideHandler);
+    el.addEventListener('sl-after-hide', afterHideHandler);
+    el.open = false;
+
+    await waitUntil(() => hideHandler.calledOnce);
+    await waitUntil(() => afterHideHandler.calledOnce);
+
+    expect(hideHandler).to.have.been.calledOnce;
+    expect(afterHideHandler).to.have.been.calledOnce;
+    expect(base.hidden).to.be.true;
+  });
+});
diff --git a/web-test-runner.config.js b/web-test-runner.config.js
new file mode 100644
index 00000000..1c6cb4af
--- /dev/null
+++ b/web-test-runner.config.js
@@ -0,0 +1,13 @@
+import { esbuildPlugin } from '@web/dev-server-esbuild';
+
+export default {
+  plugins: [esbuildPlugin({ ts: true, target: 'auto' })],
+  testRunnerHtml: testFramework => `
+    <html>
+      <head></head>
+      <body>
+        <script type="module" src="${testFramework}"></script>
+      </body>
+    </html>
+  `
+};