Add unit test for --no-install when installing dependencies

tests/unit/test_sessions.py

@@ -181,7 +181,7 @@ def test_invalid_constraint() -> None:
 
 
 @pytest.mark.parametrize("no_install", [False, True])
-def test_install_no_install(
+def test_install_local_no_install(
     sessionfactory: FakeSessionFactory, no_install: bool
 ) -> None:
     """It returns early with --no-install if the environment is being reused."""
@@ -193,6 +193,19 @@ def test_install_no_install(
     assert cast(FakeSession, session).install_called is not no_install
 
 
+@pytest.mark.parametrize("no_install", [False, True])
+def test_install_dependency_no_install(
+    sessionfactory: FakeSessionFactory, no_install: bool
+) -> None:
+    """It returns early with --no-install if the environment is being reused."""
+    session = sessionfactory(no_install=no_install)
+    proxy = nox_poetry.Session(session)
+
+    proxy.install("first")
+
+    assert cast(FakeSession, session).install_called is not no_install
+
+
 @pytest.mark.parametrize("no_install", [False, True])
 def test_installroot_no_install(
     sessionfactory: FakeSessionFactory, no_install: bool