test client accepts multiple values for a headertest-multi-value-header

Co-authored-by: Aaron Schuman <aaron@aschuman.net>

1 files changed, 10 insertions, 0 deletions

diff --git a/tests/test_test.py b/tests/test_test.py
index 26a9b47d..445a0bbc 100644
--- a/tests/test_test.py
+++ b/tests/test_test.py
@@ -20,6 +20,7 @@ from werkzeug._compat import implements_iterator
 from werkzeug._compat import iteritems
 from werkzeug._compat import to_bytes
 from werkzeug.datastructures import FileStorage
+from werkzeug.datastructures import Headers
 from werkzeug.datastructures import MultiDict
 from werkzeug.formparser import parse_form_data
 from werkzeug.test import Client
@@ -224,6 +225,15 @@ def test_environ_builder_headers_content_type():
     assert "CONTENT_TYPE" not in env
 
 
+def test_envrion_builder_multiple_headers():
+    h = Headers()
+    h.add("FOO", "bar")
+    h.add("FOO", "baz")
+    b = EnvironBuilder(headers=h)
+    env = b.get_environ()
+    assert env["HTTP_FOO"] == "bar, baz"
+
+
 def test_environ_builder_paths():
     b = EnvironBuilder(path="/foo", base_url="http://example.com/")
     strict_eq(b.base_url, "http://example.com/")