Consider not found test to return html page instead of plain error (#8)

Author: avvertix

tests/Fixtures/Saloon/extract-text-non-existing.json

@@ -3,5 +3,5 @@
     "headers": {
         "content-type": "application\/json"
     },
-    "data": "{\"detail\":\"File not found at given url.\"}"
+    "data": "{\"detail\":\"Unsupported mime type 'text\/html'. Expecting application\/pdf.\"}"
 }

tests/ParseTest.php

@@ -172,7 +172,7 @@
 
     $mockClient->assertSentCount(1);
 
-})->throws(UnprocessableEntityException::class, 'File not found at given url.');
+})->throws(UnprocessableEntityException::class, 'Unprocessable Entity (422) Response: {"detail":"Unsupported mime type \'text/html\'. Expecting application/pdf."}');
 
 test('handle pdfact not available', function () {
     $mockClient = MockClient::global([