fix(tests): use `! grep` instead of `grep -v`

`grep -v` makes sure a file contains other lines than the one that
matched. This is different from `! grep` which makes sure the file
does not contain a line that matched.

1 files changed, 2 insertions, 2 deletions

diff --git a/tests/test-scalability.yml b/tests/test-scalability.yml
index 6bb90d2..258beaf 100644
--- a/tests/test-scalability.yml
+++ b/tests/test-scalability.yml
@@ -29,7 +29,7 @@
           flavors: { min: "nano", max: "XS" }
   post_tasks:
     - name: Check stubbed commands
-      command: "{{ item.cmd }}"
+      shell: "{{ item.cmd }}"
       ignore_errors: true
       vars:
         display: "{{ item.display }}"
@@ -38,7 +38,7 @@
           display: "Expected 'clever deploy' command to be called"
         - cmd: "grep scale ../clever-commands"
           display: "Expected 'clever scale' command to be called"
-        - cmd: "grep -v restart ../clever-commands"
+        - cmd: "! grep restart ../clever-commands"
           display: "Expected 'clever restart' command to NOT be called"
       register: tests_results
     - name: show results