Enhancement: Declare strict types in test/ (#780)

* Enhancement: Require code in test/ to declare strict types

* Fix: Run 'make cs'

* Fix: Cast values to expected types

Author: localheinz

.gitattributes

@@ -5,6 +5,8 @@
 /.gitattributes           export-ignore
 /.gitignore               export-ignore
 /.php-cs-fixer.dist.php   export-ignore
+/.php-cs-fixer.rules.php  export-ignore
+/.php-cs-fixer.test.php   export-ignore
 /.yamllint.yaml           export-ignore
 /codecov.yml              export-ignore
 /Makefile                 export-ignore

.github/workflows/coding-standards.yaml

@@ -60,6 +60,10 @@ jobs:
         run: |
           vendor/bin/php-cs-fixer fix --ansi --diff --dry-run --verbose
 
+      - name: "Run php-cs-fixer for test code"
+        run: |
+          vendor/bin/php-cs-fixer fix --ansi --config=.php-cs-fixer.test.php --diff --dry-run --verbose
+
   yamllint:
     name: "yamllint"