Configure cache

Author: sebastianbergmann

.gitignore

@@ -20,6 +20,7 @@
 /.psalm/cache
 
 # PHPUnit
+/.phpunit.cache
 .phpunit.result.cache
 
 # Temporary files generated by PHPT test runner

phpunit.xml

@@ -4,6 +4,7 @@
          bootstrap="tests/bootstrap.php"
          colors="true"
          verbose="true"
+         cacheResultFile=".phpunit.cache/test-results"
          failOnRisky="true"
          failOnWarning="true">
     <testsuites>
@@ -17,7 +18,8 @@
         </testsuite>
     </testsuites>
 
-    <coverage processUncoveredFiles="true"
+    <coverage cacheDirectory=".phpunit.cache/code-coverage"
+              processUncoveredFiles="true"
               ignoreDeprecatedCodeUnits="true">
         <include>
             <directory suffix=".php">src</directory>