Add proper error formating to BlobException

Author: surister

src/crate/client/exceptions.py

@@ -86,7 +86,7 @@ def __init__(self, table, digest):
         self.digest = digest
 
     def __str__(self):
-        return "{table}/{digest}".format(table=self.table, digest=self.digest)
+        return f"{self.__class__.__qualname__}('{self.table}/{self.digest})'"
 
 
 class DigestNotFoundException(BlobException):

tests/client/test_exceptions.py

@@ -1,13 +1,16 @@
-import unittest
-
 from crate.client import Error
+from crate.client.exceptions import BlobException
+
+
+def test_error_with_msg():
+    err = Error("foo")
+    assert str(err) == "foo"
 
 
-class ErrorTestCase(unittest.TestCase):
-    def test_error_with_msg(self):
-        err = Error("foo")
-        self.assertEqual(str(err), "foo")
+def test_error_with_error_trace():
+    err = Error("foo", error_trace="### TRACE ###")
+    assert str(err), "foo\n### TRACE ###"
 
-    def test_error_with_error_trace(self):
-        err = Error("foo", error_trace="### TRACE ###")
-        self.assertEqual(str(err), "foo\n### TRACE ###")
+def test_blob_exception():
+    err = BlobException(table="sometable", digest="somedigest")
+    assert str(err) == "BlobException('sometable/somedigest)'"