diff --git a/.github/workflows/unit-test.yml b/.github/workflows/unit-test.yml
new file mode 100644
index 00000000..12943d0a
--- /dev/null
+++ b/.github/workflows/unit-test.yml
@@ -0,0 +1,38 @@
+name: Unit Tests
+
+on:
+  push:
+    branches: [master]
+  pull_request:
+    branches: [master]
+
+jobs:
+  unit-test:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Get Repo
+        uses: actions/checkout@v3
+      - name: Setup Node
+        uses: actions/setup-node@v3
+        with:
+          node-version: 18
+          cache: 'npm'
+      - name: Install Dependencies
+        run: npm ci
+      - name: Run Tests
+        run: npm test
+
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Get Repo
+        uses: actions/checkout@v3
+      - name: Setup Node
+        uses: actions/setup-node@v3
+        with:
+          node-version: 18
+          cache: 'npm'
+      - name: Install Dependencies
+        run: npm ci
+      - name: Build Project
+        run: npm run build
diff --git a/package.json b/package.json
index 33f18883..c2b81327 100644
--- a/package.json
+++ b/package.json
@@ -10,7 +10,7 @@
     "test:all": "vitest",
     "test:accessibility": "vitest accessibility --run",
     "coverage": "vitest --coverage --run",
-    "test": "echo \"Navigate into an example and run the tests from there!\" && exit 1",
+    "test": "vitest",
     "build": "tsc && vite build",
     "preview": "vite preview"
   },
diff --git a/src/examples/great-expectations/exercise.test.ts b/src/examples/great-expectations/exercise.test.ts
index 0bf7ad95..2b208ed8 100644
--- a/src/examples/great-expectations/exercise.test.ts
+++ b/src/examples/great-expectations/exercise.test.ts
@@ -12,144 +12,133 @@ import { KanbanBoard } from '$lib/kanban-board';
  * toThrowError: https://vitest.dev/api/expect.html#tothrowerror
  */
 
-it.todo(
-  'should pass if the two numbers would add up correctly in a language other than JavaScript',
-  () => {
-    expect(0.2 + 0.1).toEqual(0.3);
-  },
-);
+it('should pass if the two numbers would add up correctly in a language other than JavaScript', () => {
+  expect(0.2 + 0.1).toBeCloseTo(0.3);
+});
 
 describe('createPerson', () => {
-  it.todo('should create an instance of a person', () => {
+  it('should create an instance of a person', () => {
     const person = createPerson('Ada Lovelace');
     expect.hasAssertions();
-    // Verify that person is an instance of a Person.
+    expect(person).toBeInstanceOf(Person);
   });
 });
 
 describe('Kanban Board', () => {
-  it.todo('should include "Backlog" in board.statuses', () => {
+  it('should include "Backlog" in board.statuses', () => {
     const board = new KanbanBoard('Things to Do');
     expect.hasAssertions();
-    // Verify that board.statuses contains "Backlog".
+    expect(board.statuses).toContain('Backlog');
   });
 
-  it.todo('should *not* include "Bogus" in board.statuses', () => {
+  it('should *not* include "Bogus" in board.statuses', () => {
     const board = new KanbanBoard('Things to Do');
     expect.hasAssertions();
-    // Verify that board.statuses does not contain "Bogus".
+    expect(board.statuses).not.toContain('Bogus');
   });
 
-  it.todo(
-    'should include an added status in board.statuses using #addStatus',
-    () => {
-      const board = new KanbanBoard('Things to Do');
-      expect.hasAssertions();
-      // Use board.addStatus to add a status.
-      // Verify that the new status is—in fact—now in board.statuses.
-    },
-  );
-
-  it.todo('should remove a status using #removeStatus', () => {
+  it('should include an added status in board.statuses using #addStatus', () => {
     const board = new KanbanBoard('Things to Do');
     expect.hasAssertions();
-    // Use board.removeStatus to remove a status.
-
-    // You can be clever or you can just assume "Backlog" is in board.statuses
-    // by default.
+    const newStatus = 'Testing';
+    board.addStatus(newStatus);
+    expect(board.statuses).toContain(newStatus);
+  });
 
-    // Verify that the status is no longer in in board.statuses.
+  it('should remove a status using #removeStatus', () => {
+    const board = new KanbanBoard('Things to Do');
+    expect.hasAssertions();
+    const statusToRemove = 'Ready';
+    expect(board.statuses).toContain(statusToRemove);
+    board.removeStatus(statusToRemove);
+    expect(board.statuses).not.toContain(statusToRemove);
   });
 });
 
 describe('Person', () => {
-  it.todo('will create a person with a first name', () => {
+  it('will create a person with a first name', () => {
     const person = new Person('Madonna');
     expect.hasAssertions();
-    // Verify that person.firstName is correct.
+    expect(person).toHaveProperty('firstName', 'Madonna');
   });
 
-  it.todo('will create a person with a first and last name', () => {
+  it('will create a person with a first and last name', () => {
     const person = new Person('Madonna Cicone');
     expect.hasAssertions();
-    // Verify that person.lastName is correct.
+    expect(person).toHaveProperty('firstName', 'Madonna');
+    expect(person).toHaveProperty('lastName', 'Cicone');
   });
 
-  it.todo('will create a person with a first, middle, and last name', () => {
+  it('will create a person with a first, middle, and last name', () => {
     const person = new Person('Madonna Louise Cicone');
     expect.hasAssertions();
-    // Verify that person.middleName is correct.
+    expect(person).toHaveProperty('firstName', 'Madonna');
+    expect(person).toHaveProperty('middleName', 'Louise');
+    expect(person).toHaveProperty('lastName', 'Cicone');
   });
 
-  it.todo('will throw if you provide an empty string', () => {
+  it('will throw if you provide an empty string', () => {
     const fn = () => {
       new Person('');
     };
 
     expect.hasAssertions();
-
-    // Verify that function above throws.
+    expect(fn).toThrowError();
   });
 
-  it.todo(
-    'will throw a specific error message if you provide an empty string',
-    () => {
-      const errorMessage = 'fullName cannot be an empty string';
+  it('will throw a specific error message if you provide an empty string', () => {
+    const errorMessage = 'fullName cannot be an empty string';
 
-      const fn = () => {
-        new Person('');
-      };
-
-      expect.hasAssertions();
+    const fn = () => {
+      new Person('');
+    };
 
-      // Verify that function above throws the error message above.
-    },
-  );
+    expect.hasAssertions();
+    expect(fn).toThrowError(errorMessage);
+  });
 
-  it.todo('will add a friend', () => {
+  it('will add a friend', () => {
     const john = new Person('John Lennon');
     const paul = new Person('Paul McCartney');
 
     john.addFriend(paul);
 
     expect.hasAssertions();
-
-    // Verify that john.friends contains paul.
+    expect(john.friends).toContain(paul);
   });
 
-  it.todo('will mutually add a friend', () => {
+  it('will mutually add a friend', () => {
     const john = new Person('John Lennon');
     const paul = new Person('Paul McCartney');
 
     john.addFriend(paul);
 
     expect.hasAssertions();
-
-    // Verify that paul.friends contains john.
+    expect(paul.friends).toContain(john);
   });
 
-  it.todo('will remove a friend', () => {
+  it('will remove a friend', () => {
     const john = new Person('John Lennon');
     const paul = new Person('Paul McCartney');
 
     john.addFriend(paul);
+    expect(john.friends).toContain(paul);
     john.removeFriend(paul);
 
     expect.hasAssertions();
-
-    // Verify that john.friends does not include paul.
+    expect(john.friends).not.toContain(paul);
   });
 
-  it.todo('will mutually remove friends', () => {
+  it('will mutually remove friends', () => {
     const john = new Person('John Lennon');
     const paul = new Person('Paul McCartney');
 
     john.addFriend(paul);
+    expect(paul.friends).toContain(john);
     john.removeFriend(paul);
 
     expect.hasAssertions();
-
-    // Verify that paul.friends does not include john.
+    expect(paul.friends).not.toContain(john);
   });
 });
 
@@ -158,11 +147,13 @@ const explode = () => {
 };
 
 describe('explode', () => {
-  it.todo('should throw an error', () => {
-    explode();
+  it('should throw an error', () => {
+    const fn = () => explode();
+    expect(fn).toThrowError();
   });
 
-  it.todo('should throw a specific error containing "terribly wrong"', () => {
-    explode();
+  it('should throw a specific error containing "terribly wrong"', () => {
+    const fn = () => explode();
+    expect(fn).toThrowError(/terribly wrong/i);
   });
 });
diff --git a/src/examples/great-expectations/items-slice.test.ts b/src/examples/great-expectations/items-slice.test.ts
index 4a9bebee..67f52e86 100644
--- a/src/examples/great-expectations/items-slice.test.ts
+++ b/src/examples/great-expectations/items-slice.test.ts
@@ -10,22 +10,28 @@ it('returns an empty array as the initial state', () => {
   expect(reducer(undefined, { type: 'noop' })).toEqual([]);
 });
 
-it.todo('supports adding an item with the correct name', () => {
+it('supports adding an item with the correct name', () => {
   expect.hasAssertions();
-  const result = reducer([], add({ name: 'iPhone' }));
+  const itemName = 'iPhone';
+  const result = reducer([], add({ name: itemName }));
+  expect(result).toEqual([expect.objectContaining({ name: itemName })]);
 });
 
-it.todo('prefixes ids with "item-"', () => {
+it('prefixes ids with "item-"', () => {
   expect.hasAssertions();
   const result = reducer([], add({ name: 'iPhone' }));
+  expect(result).toEqual([
+    expect.objectContaining({ id: expect.stringMatching(/^item-/) }),
+  ]);
 });
 
-it.todo('defaults new items to a packed status of false', () => {
+it('defaults new items to a packed status of false', () => {
   expect.hasAssertions();
   const result = reducer([], add({ name: 'iPhone' }));
+  expect(result).toEqual([expect.objectContaining({ packed: false })]);
 });
 
-it.todo('supports removing an item', () => {
+it('supports removing an item', () => {
   expect.hasAssertions();
   const state = [
     {
@@ -36,9 +42,10 @@ it.todo('supports removing an item', () => {
   ];
 
   const result = reducer(state, remove({ id: '1' }));
+  expect(result).not.toContain(expect.objectContaining({ id: '1' }));
 });
 
-it.todo('supports toggling an item', () => {
+it('supports toggling an item', () => {
   expect.hasAssertions();
   const state = [
     {
@@ -49,9 +56,12 @@ it.todo('supports toggling an item', () => {
   ];
 
   const result = reducer(state, toggle({ id: '1' }));
+  expect(result).not.toEqual(
+    expect.objectContaining({ packed: state[0].packed }),
+  );
 });
 
-it.todo('supports updating an item', () => {
+it('supports updating an item', () => {
   expect.hasAssertions();
   const state = [
     {
@@ -65,9 +75,13 @@ it.todo('supports updating an item', () => {
     state,
     update({ id: '1', name: 'Samsung Galaxy S23' }),
   );
+  expect(result).not.toEqual([expect.objectContaining({ name: 'iPhone' })]);
+  expect(result).toEqual([
+    expect.objectContaining({ name: 'Samsung Galaxy S23' }),
+  ]);
 });
 
-it.todo('supports marking all items as unpacked', () => {
+it('supports marking all items as unpacked', () => {
   expect.hasAssertions();
   const state = [
     {
@@ -83,4 +97,5 @@ it.todo('supports marking all items as unpacked', () => {
   ];
 
   const result = reducer(state, markAllAsUnpacked());
+  expect(result).toMatchObject([{ packed: false }, { packed: false }]);
 });