Role can be fully called in check mode

tasks/prepare.yml

@@ -21,6 +21,7 @@
     executable: /bin/sh
   register: nginx_version
   changed_when: false
+  check_mode: no
 
 - name: SHELL | Get module list
   shell: nginx -V 2>&1 | tr -- - '\n' | grep -A 1 with | grep _module | sed -r 's/_module//g; s/\s+//g' | sort
@@ -28,6 +29,7 @@
     executable: /bin/sh
   register: shell_modules
   changed_when: false
+  check_mode: no
 
 - name: SET_FACT | Save modules
   set_fact:

tasks/ssl.yml

@@ -49,4 +49,4 @@
   register: job_result
   until: job_result.finished
   retries: 30
-  when: nginx_dh is not string
+  when: not ansible_check_mode and nginx_dh is not string