tests: session: Remake test_insecure_host into test_trusted_host

tests/unit/test_network_session.py

@@ -72,17 +72,24 @@ def test_http_cache_is_not_enabled(self, tmpdir):
 
         assert not hasattr(session.adapters["http://"], "cache")
 
-    def test_insecure_host_adapter(self, tmpdir):
+    @pytest.mark.parametrize("cache_trusted_hosts", [True, False])
+    def test_trusted_hosts_adapter(self, tmpdir, cache_trusted_hosts):
         session = PipSession(
             cache=tmpdir.joinpath("test-cache"),
             trusted_hosts=["example.com"],
+            cache_trusted_hosts=cache_trusted_hosts,
         )
 
         assert "https://example.com/" in session.adapters
         # Check that the "port wildcard" is present.
         assert "https://example.com:" in session.adapters
-        # Check that the cache isn't enabled.
-        assert not hasattr(session.adapters["https://example.com/"], "cache")
+        # Check that the cache is enabled only when
+        # "cache_trusted_hosts" is enabled.
+        assert (
+            cache_trusted_hosts == (
+                hasattr(session.adapters["https://example.com/"], "cache")
+            )
+        )
 
     def test_add_trusted_host(self):
         # Leave a gap to test how the ordering is affected.