diff --git a/examples/ansible/templating.yml b/examples/ansible/templating.yml
index a5c64f7..4f94cdd 100644
--- a/examples/ansible/templating.yml
+++ b/examples/ansible/templating.yml
@@ -2,6 +2,9 @@
 
 - name: Show off Ansible's templating
   hosts: all
+  vars:
+    random_string: ""
+    random_integer: random(-34485, 45666)
   tasks:
 
     # A.K.A. ternary operator.
@@ -70,12 +73,31 @@
       ansible.builtin.debug:
         var: "'string' | type_debug"
 
+    - name: Make assertions.
+      ansible.builtin.assert:
+        that:
+          - 12 | type_debug == "int"
+          - 12 < 24
+
 - name: Show off Ansible's testing
   hosts: all
   vars:
-    url: "https://example.com/users/foo/resources/bar"
+    resource_url: "https://example.com/users/foo/resources/bar"
+    random_string: "{{ lookup('password', '/dev/null length=8 chars=ascii_letters') }}"
   tasks:
 
+    - name: Check a variable is a string.
+      ansible.builtin.debug:
+        var: "'{{ random_string }}' is string"
+
+    - name: Check a value is an integer.
+      ansible.builtin.debug:
+        var: 34 is integer
+
+    - name: Check a given URL is in fact an URL.
+      ansible.builtin.debug:
+        var: "'{{ resource_url }}' is url"
+
     - name: Compare a semver version number.
       ansible.builtin.debug:
         var: "'2.0.0-rc.1+build.123' is version('2.1.0-rc.2+build.423', 'ge', version_type='semver')"
@@ -91,10 +113,10 @@
       ansible.builtin.debug:
         msg: "{{ item }}"
       with_items:
-        - "{{ url is match('https://example.com/users/.*/resources') }}"
-        - "{{ url is search('users/.*/resources/.*') }}"
-        - "{{ url is search('USERS', ignorecase=true) }}"
-        - "{{ url is regex('example\\.com/\\w+/foo') }}"
+        - "{{ resource_url is match('https://example.com/users/.*/resources') }}"
+        - "{{ resource_url is search('users/.*/resources/.*') }}"
+        - "{{ resource_url is search('USERS', ignorecase=true) }}"
+        - "{{ resource_url is regex('example\\.com/\\w+/foo') }}"
 
 - name: Show off Ansible's loops
   hosts: all
diff --git a/knowledge base/ansible.md b/knowledge base/ansible.md
index 146b049..93056bf 100644
--- a/knowledge base/ansible.md	
+++ b/knowledge base/ansible.md	
@@ -32,6 +32,7 @@
 
 ```sh
 # Install.
+pip3 install 'ansible'
 pip3 install --user 'ansible' && port install 'sshpass'   # darwin
 sudo pamac install 'ansible' 'sshpass'                    # manjaro linux
 
@@ -193,7 +194,6 @@ Return a boolean result.
     var: "{{ item }}"
   with_items: ["ansible_local", "playbook_dir", "role_path"]
 
-
 # Fail when any of the given variables is an empty string.
 # Returns the ones which are empty.
 - when: lookup('vars', item) == ''