recwarn: fix was -> were in DID NOT WARN message

Author: bluetech

src/_pytest/recwarn.py

@@ -274,7 +274,7 @@ def __exit__(
                 if not any(issubclass(r.category, self.expected_warning) for r in self):
                     __tracebackhide__ = True
                     fail(
-                        "DID NOT WARN. No warnings of type {} was emitted. "
+                        "DID NOT WARN. No warnings of type {} were emitted. "
                         "The list of emitted warnings is: {}.".format(
                             self.expected_warning, [each.message for each in self]
                         )
@@ -287,7 +287,7 @@ def __exit__(
                     else:
                         fail(
                             "DID NOT WARN. No warnings of type {} matching"
-                            " ('{}') was emitted. The list of emitted warnings"
+                            " ('{}') were emitted. The list of emitted warnings"
                             " is: {}.".format(
                                 self.expected_warning,
                                 self.match_expr,

testing/test_recwarn.py

@@ -263,23 +263,23 @@ def test_as_contextmanager(self) -> None:
             with pytest.warns(RuntimeWarning):
                 warnings.warn("user", UserWarning)
         excinfo.match(
-            r"DID NOT WARN. No warnings of type \(.+RuntimeWarning.+,\) was emitted. "
+            r"DID NOT WARN. No warnings of type \(.+RuntimeWarning.+,\) were emitted. "
             r"The list of emitted warnings is: \[UserWarning\('user',?\)\]."
         )
 
         with pytest.raises(pytest.fail.Exception) as excinfo:
             with pytest.warns(UserWarning):
                 warnings.warn("runtime", RuntimeWarning)
         excinfo.match(
-            r"DID NOT WARN. No warnings of type \(.+UserWarning.+,\) was emitted. "
+            r"DID NOT WARN. No warnings of type \(.+UserWarning.+,\) were emitted. "
             r"The list of emitted warnings is: \[RuntimeWarning\('runtime',?\)\]."
         )
 
         with pytest.raises(pytest.fail.Exception) as excinfo:
             with pytest.warns(UserWarning):
                 pass
         excinfo.match(
-            r"DID NOT WARN. No warnings of type \(.+UserWarning.+,\) was emitted. "
+            r"DID NOT WARN. No warnings of type \(.+UserWarning.+,\) were emitted. "
             r"The list of emitted warnings is: \[\]."
         )
 
@@ -290,7 +290,7 @@ def test_as_contextmanager(self) -> None:
                 warnings.warn("import", ImportWarning)
 
         message_template = (
-            "DID NOT WARN. No warnings of type {0} was emitted. "
+            "DID NOT WARN. No warnings of type {0} were emitted. "
             "The list of emitted warnings is: {1}."
         )
         excinfo.match(