diff --git a/tests/functional/test_new_resolver_errors.py b/tests/functional/test_new_resolver_errors.py
new file mode 100644
index 000000000..267f21307
--- /dev/null
+++ b/tests/functional/test_new_resolver_errors.py
@@ -0,0 +1,26 @@
+from tests.lib import create_basic_wheel_for_package
+
+
+def test_new_resolver_conflict_requirements_file(tmpdir, script):
+    create_basic_wheel_for_package(script, "base", "1.0")
+    create_basic_wheel_for_package(script, "base", "2.0")
+    create_basic_wheel_for_package(
+        script, "pkga", "1.0", depends=["base==1.0"],
+    )
+    create_basic_wheel_for_package(
+        script, "pkgb", "1.0", depends=["base==2.0"],
+    )
+
+    req_file = tmpdir.joinpath("requirements.txt")
+    req_file.write_text("pkga\npkgb")
+
+    result = script.pip(
+        "install", "--use-feature=2020-resolver",
+        "--no-cache-dir", "--no-index",
+        "--find-links", script.scratch_path,
+        "-r", req_file,
+        expect_error=True,
+    )
+
+    message = "package versions have conflicting dependencies"
+    assert message in result.stderr, str(result)