diff --git a/__tests__/routing.test.ts b/__tests__/routing.test.ts
index 65cef0f..30cf69e 100644
--- a/__tests__/routing.test.ts
+++ b/__tests__/routing.test.ts
@@ -1,20 +1,47 @@
 import { createRouting, number, segment } from '../src/index';
 
-describe('routing', () => {
-  it('should create routing', () => {
+describe('createRouting', () => {
+  it('creates a simple route', () => {
     const routes = createRouting({
-      company: segment`/companies/${number('companyId')}`,
-      contact: segment`/contacts/${number('contactId')}`,
-      insight: segment`/insight/${number('insightId')}`,
-      admin: {
-        ...segment`/admin`,
+      products: segment`/products`,
+    } as const);
+
+    const route = routes.products();
+
+    expect(route).toEqual('/products');
+  });
+
+  it('creates nested routes', () => {
+    const routes = createRouting({
+      products: {
+        ...segment`/products`,
+        children: {
+          create: segment`/create`,
+        },
+      },
+    } as const);
+
+    const mainRoute = routes.products();
+    const nestedRoute = routes.products.create();
+
+    expect(mainRoute).toEqual('/products');
+    expect(nestedRoute).toEqual('/products/create');
+  });
+
+  it('creates nested routes with params', () => {
+    const routes = createRouting({
+      products: {
+        ...segment`/products/${number('productId')}`,
         children: {
-          users: segment`/users`,
+          edit: segment`/edit`,
         },
       },
-      onetime: segment`/onetime`,
     } as const);
 
-    routes.company({ companyId: '20' });
+    const mainRoute = routes.products({ productId: '2' });
+    const nestedRoute = routes.products.edit({ productId: '2' });
+
+    expect(mainRoute).toEqual('/products/2');
+    expect(nestedRoute).toEqual('/products/2/edit');
   });
 });
diff --git a/__tests__/segments/arg.test.ts b/__tests__/segments/arg.test.ts
new file mode 100644
index 0000000..7be1cc9
--- /dev/null
+++ b/__tests__/segments/arg.test.ts
@@ -0,0 +1,47 @@
+import { arg, createRouting, segment } from '../../src';
+
+describe('arg segment', () => {
+  it('creates route with an arg segment', () => {
+    const routes = createRouting({
+      product: segment`/product/${arg('productId')}`,
+    } as const);
+
+    const route = routes.product({ productId: 'id' });
+
+    expect(route).toEqual('/product/id');
+  });
+
+  it('creates route with an optional arg segment', () => {
+    const routes = createRouting({
+      product: segment`/product/${arg('productId', {
+        optional: true,
+      })}`,
+    } as const);
+
+    const route = routes.product();
+
+    expect(route).toEqual('/product');
+  });
+
+  it('creates route with a custom pattern param', () => {
+    const routes = createRouting({
+      product: segment`/product/${arg('productId', {
+        pattern: /[0-9]{2}/.source,
+      })}`,
+    } as const);
+
+    const route = routes.product({ productId: '23' });
+
+    expect(route).toEqual('/product/23');
+  });
+
+  it('route with a custom pattern param gets correctly validated', () => {
+    const routes = createRouting({
+      product: segment`/product/${arg('productId', {
+        pattern: /[0-9]{2}/.source,
+      })}`,
+    } as const);
+
+    expect(() => routes.product({ productId: '123' })).toThrow();
+  });
+});
diff --git a/__tests__/segments/number.test.ts b/__tests__/segments/number.test.ts
new file mode 100644
index 0000000..3484d0b
--- /dev/null
+++ b/__tests__/segments/number.test.ts
@@ -0,0 +1,31 @@
+import { createRouting, number, segment } from '../../src';
+
+describe('number segment', () => {
+  it('creates route with an optional number param', () => {
+    const routes = createRouting({
+      product: segment`/product/${number('productId', true)}`,
+    } as const);
+
+    const route = routes.product();
+
+    expect(route).toEqual('/product');
+  });
+
+  it('creates route with a required number param', () => {
+    const routes = createRouting({
+      product: segment`/product/${number('productId')}`,
+    } as const);
+
+    const route = routes.product({ productId: '1' });
+
+    expect(route).toEqual('/product/1');
+  });
+
+  it('throws when given an invalid number param', () => {
+    const routes = createRouting({
+      product: segment`/product/${number('productId')}`,
+    } as const);
+
+    expect(() => routes.product({ productId: 'aaa' })).toThrow();
+  });
+});
diff --git a/__tests__/segments/query.test.ts b/__tests__/segments/query.test.ts
new file mode 100644
index 0000000..2583715
--- /dev/null
+++ b/__tests__/segments/query.test.ts
@@ -0,0 +1,36 @@
+import { createRouting, number, query, segment } from '../../src';
+
+describe('query segment', () => {
+  it('creates route with an optional query param', () => {
+    const routes = createRouting({
+      product: segment`/product${query({ productId: false })}`,
+    } as const);
+
+    const route = routes.product();
+
+    expect(route).toEqual('/product');
+  });
+
+  it('creates route with a required query param', () => {
+    const routes = createRouting({
+      product: segment`/product${query({ productId: true })}`,
+    } as const);
+
+    const route = routes.product({}, { productId: '2' });
+
+    expect(route).toEqual('/product?productId=2');
+  });
+
+  it('creates route with multiple query params and they are sorted in alphabetical order', () => {
+    const routes = createRouting({
+      product: segment`/product${query({
+        productId: true,
+        details: true,
+      })}`,
+    } as const);
+
+    const route = routes.product({}, { productId: '2', details: 'false' });
+
+    expect(route).toEqual(`/product?details=false&productId=2`);
+  });
+});
diff --git a/__tests__/segments/uuid.test.ts b/__tests__/segments/uuid.test.ts
new file mode 100644
index 0000000..1cec77a
--- /dev/null
+++ b/__tests__/segments/uuid.test.ts
@@ -0,0 +1,43 @@
+import { createRouting, number, segment, uuid } from '../../src';
+
+describe('uuid segment', () => {
+  const testUuid = '3d368832-0bc0-4fcc-bf75-5bd8794c1ad3';
+
+  it('creates route with an optional uuid param', () => {
+    const routes = createRouting({
+      product: segment`/product/${uuid('productId', true)}`,
+    } as const);
+
+    const route = routes.product();
+
+    expect(route).toEqual('/product');
+  });
+
+  it('creates route with a required uuid param', () => {
+    const routes = createRouting({
+      product: segment`/product/${uuid('productId')}`,
+    } as const);
+
+    const route = routes.product({ productId: testUuid });
+
+    expect(route).toEqual(`/product/${testUuid}`);
+  });
+
+  it('throws when given a plain string', () => {
+    const routes = createRouting({
+      product: segment`/product/${uuid('productId')}`,
+    } as const);
+
+    expect(() => routes.product({ productId: 'a' })).toThrow();
+  });
+
+  it('throws when given an invalid uuid', () => {
+    const routes = createRouting({
+      product: segment`/product/${uuid('productId')}`,
+    } as const);
+
+    expect(() =>
+      routes.product({ productId: '3d368832-0bc-4fcc-bf75-5bd8794c1ad3' })
+    ).toThrow();
+  });
+});