Make messages for errors during baseline loading consistent

Author: sebastianbergmann

src/Runner/Baseline/Reader.php

@@ -50,7 +50,8 @@ public function read(string $baselineFile): Baseline
         } catch (XmlException $e) {
             throw new CannotLoadBaselineException(
                 sprintf(
-                    'Cannot read baseline: %s',
+                    'Cannot read baseline %s: %s',
+                    $baselineFile,
                     trim($e->getMessage()),
                 ),
             );

tests/end-to-end/baseline/baseline-invalid-xml.phpt

@@ -21,9 +21,7 @@ Time: %s, Memory: %s
 
 There was 1 PHPUnit test runner warning:
 
-1) Cannot read baseline: Could not load "%sbaseline.xml":
-
-%snd%sag%s
+1) Cannot read baseline %sbaseline.xml: %s
 
 WARNINGS!
 Tests: 1, Assertions: 1, Warnings: 1.