add test for bearer token auth varaiants

Author: loechel

tests/test_auth.py

@@ -26,8 +26,8 @@ def test_basic_auth():
         flow.send(response)
 
 
-def test_bearer_token_auth():
-    auth = httpx.BearerTokenAuth(bearer_token="my_token")
+def test_bearer_token_auth_header():
+    auth = httpx.BearerTokenAuth(bearer_token="secret")
     request = httpx.Request("GET", "https://www.example.com")
 
     # The initial request should include a bearer token auth header.
@@ -41,6 +41,22 @@ def test_bearer_token_auth():
         flow.send(response)
 
 
+def test_bearer_token_auth_form_encoded():
+    with pytest.raises(
+        NotImplementedError,
+    ):
+        auth = httpx.BearerTokenAuth(bearer_token="secret", variant="FORM-ENCODED")
+        assert auth  # pragma: no cover
+
+
+def test_bearer_token_auth_query():
+    with pytest.raises(
+        NotImplementedError,
+    ):
+        auth = httpx.BearerTokenAuth(bearer_token="secret", variant="QUERY")
+        assert auth  # pragma: no cover
+
+
 def test_digest_auth_with_200():
     auth = httpx.DigestAuth(username="user", password="pass")
     request = httpx.Request("GET", "https://www.example.com")