From 9b3cd280fdafcfa4a3d00a0a26594566609de535 Mon Sep 17 00:00:00 2001
From: Tzu-ping Chung <uranusjr@gmail.com>
Date: Wed, 4 Nov 2020 00:05:26 +0800
Subject: [PATCH] Add failing test

---
 tests/functional/test_new_resolver.py | 43 +++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)

diff --git a/tests/functional/test_new_resolver.py b/tests/functional/test_new_resolver.py
index 374d37aee..5e36ec498 100644
--- a/tests/functional/test_new_resolver.py
+++ b/tests/functional/test_new_resolver.py
@@ -1132,3 +1132,46 @@ def test_new_resolver_check_wheel_version_normalized(
         "simple"
     )
     assert_installed(script, simple="0.1.0+local.1")
+
+
+def test_new_resolver_contraint_on_dep_with_extra(script):
+    create_basic_wheel_for_package(
+        script,
+        name="simple",
+        version="1",
+        depends=["dep[x]"],
+    )
+    create_basic_wheel_for_package(
+        script,
+        name="dep",
+        version="1",
+        extras={"x": ["depx==1"]},
+    )
+    create_basic_wheel_for_package(
+        script,
+        name="dep",
+        version="2",
+        extras={"x": ["depx==2"]},
+    )
+    create_basic_wheel_for_package(
+        script,
+        name="depx",
+        version="1",
+    )
+    create_basic_wheel_for_package(
+        script,
+        name="depx",
+        version="2",
+    )
+
+    constraints_txt = script.scratch_path / "constraints.txt"
+    constraints_txt.write_text("dep==1")
+
+    script.pip(
+        "install",
+        "--no-cache-dir", "--no-index",
+        "--find-links", script.scratch_path,
+        "--constraint", constraints_txt,
+        "simple",
+    )
+    assert_installed(script, simple="1", dep="1", depx="1")