Fix the grammar on ErrorTree's repr when it has 1 error.

CHANGELOG.rst

@@ -1,3 +1,8 @@
+v4.16.1
+=======
+
+* Make ``ErrorTree`` have a more grammatically correct ``repr``.
+
 v4.16.0
 =======
 

jsonschema/exceptions.py

@@ -297,7 +297,9 @@ def __len__(self):
         return self.total_errors
 
     def __repr__(self):
-        return f"<{self.__class__.__name__} ({len(self)} total errors)>"
+        total = len(self)
+        errors = "error" if total == 1 else "errors"
+        return f"<{self.__class__.__name__} ({total} total {errors})>"
 
     @property
     def total_errors(self):

jsonschema/tests/test_exceptions.py

@@ -396,7 +396,17 @@ def test_if_its_in_the_tree_anyhow_it_does_not_raise_an_error(self):
         tree = exceptions.ErrorTree([error])
         self.assertIsInstance(tree["foo"], exceptions.ErrorTree)
 
-    def test_repr(self):
+    def test_repr_single(self):
+        error = exceptions.ValidationError(
+            "1",
+            validator="foo",
+            path=["bar", "bar2"],
+            instance="i1",
+        )
+        tree = exceptions.ErrorTree([error])
+        self.assertEqual(repr(tree), "<ErrorTree (1 total error)>")
+
+    def test_repr_multiple(self):
         e1, e2 = (
             exceptions.ValidationError(
                 "1",
@@ -412,6 +422,10 @@ def test_repr(self):
         tree = exceptions.ErrorTree([e1, e2])
         self.assertEqual(repr(tree), "<ErrorTree (2 total errors)>")
 
+    def test_repr_empty(self):
+        tree = exceptions.ErrorTree([])
+        self.assertEqual(repr(tree), "<ErrorTree (0 total errors)>")
+
 
 class TestErrorInitReprStr(TestCase):
     def make_error(self, **kwargs):