Try removing the check for cached files to make the tests runs reliably.

appveyor.yml

@@ -36,27 +36,27 @@ install:
   - IF EXIST C:\php (SET PHP=0)
   - ps: appveyor-retry cinst --params '""/InstallDir:C:\php""' --ignore-checksums -y php --version ((choco search php --exact --all-versions -r | select-string -pattern $env:php_ver_target | sort { [version]($_ -split '\|' | select -last 1) } -Descending | Select-Object -first 1) -replace '[php|]','')
   - cd C:\php
-  - IF %PHP%==1 copy php.ini-production php.ini /Y
-  - IF %PHP%==1 echo date.timezone="UTC" >> php.ini
-  - IF %PHP%==1 echo extension_dir=ext >> php.ini
-  - IF %PHP%==1 echo extension=php_openssl.dll >> php.ini
-  - IF %PHP%==1 echo extension=php_mbstring.dll >> php.ini
-  - IF %PHP%==1 echo extension=php_intl.dll >> php.ini
-  - IF %PHP%==1 echo extension=php_fileinfo.dll >> php.ini
+  - copy php.ini-production php.ini /Y
+  - echo date.timezone="UTC" >> php.ini
+  - echo extension_dir=ext >> php.ini
+  - echo extension=php_openssl.dll >> php.ini
+  - echo extension=php_mbstring.dll >> php.ini
+  - echo extension=php_intl.dll >> php.ini
+  - echo extension=php_fileinfo.dll >> php.ini
 
-  - IF %PHP%==1 curl -fsS https://windows.php.net/downloads/pecl/releases/pdo_sqlsrv/5.2.0/php_pdo_sqlsrv-5.2.0-7.2-nts-vc15-x64.zip -o pdosqlsrv.zip
-  - IF %PHP%==1 7z x pdosqlsrv.zip -oC:\php\ext php_pdo_sqlsrv.dll > nul
-  - IF %PHP%==1 curl -fsS https://windows.php.net/downloads/pecl/releases/sqlsrv/5.2.0/php_sqlsrv-5.2.0-7.2-nts-vc15-x64.zip -o sqlsrv.zip
-  - IF %PHP%==1 7z x sqlsrv.zip -oC:\php\ext php_sqlsrv.dll > nul
-  - IF %PHP%==1 echo extension=php_pdo_sqlsrv.dll >> php.ini
-  - IF %PHP%==1 echo extension=php_sqlsrv.dll >> php.ini
+  - curl -fsS https://windows.php.net/downloads/pecl/releases/pdo_sqlsrv/5.2.0/php_pdo_sqlsrv-5.2.0-7.2-nts-vc15-x64.zip -o pdosqlsrv.zip
+  - 7z x pdosqlsrv.zip -oC:\php\ext php_pdo_sqlsrv.dll > nul
+  - curl -fsS https://windows.php.net/downloads/pecl/releases/sqlsrv/5.2.0/php_sqlsrv-5.2.0-7.2-nts-vc15-x64.zip -o sqlsrv.zip
+  - 7z x sqlsrv.zip -oC:\php\ext php_sqlsrv.dll > nul
+  - echo extension=php_pdo_sqlsrv.dll >> php.ini
+  - echo extension=php_sqlsrv.dll >> php.ini
 
-  - IF %PHP%==1 curl -fsS https://windows.php.net/downloads/pecl/releases/wincache/2.0.0.8/php_wincache-2.0.0.8-7.2-nts-vc15-x64.zip -o wincache.zip
-  - IF %PHP%==1 7z x wincache.zip -oC:\php\ext php_wincache.dll > nul
-  - IF %PHP%==1 echo extension=php_wincache.dll >> php.ini
-  - IF %PHP%==1 echo wincache.enablecli = 1 >> php.ini
+  - curl -fsS https://windows.php.net/downloads/pecl/releases/wincache/2.0.0.8/php_wincache-2.0.0.8-7.2-nts-vc15-x64.zip -o wincache.zip
+  - 7z x wincache.zip -oC:\php\ext php_wincache.dll > nul
+  - echo extension=php_wincache.dll >> php.ini
+  - echo wincache.enablecli = 1 >> php.ini
 
-  - IF %PHP%==1 echo @php %%~dp0composer.phar %%* > composer.bat
+  - echo @php %%~dp0composer.phar %%* > composer.bat
   - appveyor-retry appveyor DownloadFile https://getcomposer.org/composer.phar
 
   - cd C:\projects\cakephp