diff --git a/test/webfuse_provider/provider/test_client.cc b/test/webfuse_provider/provider/test_client.cc
index 4f9e41b..5010bfb 100644
--- a/test/webfuse_provider/provider/test_client.cc
+++ b/test/webfuse_provider/provider/test_client.cc
@@ -119,7 +119,6 @@ TEST(Client, ConnectFailNotReachable)
     wfp_client_config_dispose(config);
 }
 
-
 TEST(Client, Lookup)
 {
     MockProviderClient provider;
@@ -223,10 +222,9 @@ TEST(Client, Open)
     EXPECT_CALL(provider, OnDisconnected()).Times(1)
         .WillOnce(Invoke([&]() { disconnected.set_value(); }));
 
-    EXPECT_CALL(provider, Lookup(1,StrEq("foo"),_)).Times(1)
-        .WillOnce(Invoke([](ino_t, char const *, struct stat * result) {
-            result->st_ino = 42;
-            result->st_mode = S_IFREG | 0644;
+    EXPECT_CALL(provider, Open(1, 0, _)).Times(1)
+        .WillOnce(Invoke([](int, int, uint32_t * handle) {
+            *handle = 4711;
         }));
 
     wfp_client_config * config = wfp_client_config_create();
@@ -238,18 +236,12 @@ TEST(Client, Open)
 
         ASSERT_EQ(std::future_status::ready, connected.get_future().wait_for(TIMEOUT));
 
-        json_t * response = server.Lookup(1, "foo");
+        json_t * response = server.Open(1, 0);
         ASSERT_TRUE(json_is_object(response));
         json_t * result = json_object_get(response, "result");
 
-        json_t * inode = json_object_get(result, "inode");
-        ASSERT_EQ(42, json_integer_value(inode));
-
-        json_t * mode = json_object_get(result, "mode");
-        ASSERT_EQ(0644, json_integer_value(mode));
-
-        json_t * type = json_object_get(result, "type");
-        ASSERT_STREQ("file", json_string_value(type));
+        json_t * handle = json_object_get(result, "handle");
+        ASSERT_EQ(4711, json_integer_value(handle));
 
         json_decref(response);
 
diff --git a/test/webfuse_provider/test_util/webfuse_server.cc b/test/webfuse_provider/test_util/webfuse_server.cc
index 8ddfa3a..f05b658 100644
--- a/test/webfuse_provider/test_util/webfuse_server.cc
+++ b/test/webfuse_provider/test_util/webfuse_server.cc
@@ -328,5 +328,15 @@ json_t * WebfuseServer::Lookup(int parent, std::string const & name)
     return d->Invoke("lookup", params);
 }
 
+json_t * WebfuseServer::Open(int inode, int flags)
+{
+    json_t * params = json_array();
+    json_array_append_new(params, json_string(d->GetFilesystem().c_str()));
+    json_array_append_new(params, json_integer(inode));
+    json_array_append_new(params, json_integer(flags));
+
+    return d->Invoke("open", params);
+}
+
 
 }
\ No newline at end of file
diff --git a/test/webfuse_provider/test_util/webfuse_server.hpp b/test/webfuse_provider/test_util/webfuse_server.hpp
index add2e4c..24db92e 100644
--- a/test/webfuse_provider/test_util/webfuse_server.hpp
+++ b/test/webfuse_provider/test_util/webfuse_server.hpp
@@ -18,6 +18,7 @@ public:
     json_t * Invoke(std::string const & method, json_t * params);
     json_t * Invoke(std::string const & method, std::string const & params);
     json_t * Lookup(int parent, std::string const & name);
+    json_t * Open(int inode, int flags);
 private:
     class Private;
     Private * d;