diff --git a/.idea/appflowy_client.iml b/.idea/appflowy_client.iml
index f33c861988..5c6b5b4d21 100644
--- a/.idea/appflowy_client.iml
+++ b/.idea/appflowy_client.iml
@@ -83,6 +83,9 @@
       <excludeFolder url="file://$MODULE_DIR$/app_flowy/packages/flowy_infra/.dart_tool" />
       <excludeFolder url="file://$MODULE_DIR$/app_flowy/packages/flowy_infra/build" />
       <excludeFolder url="file://$MODULE_DIR$/app_flowy/packages/flowy_infra/.pub" />
+      <excludeFolder url="file://$MODULE_DIR$/app_flowy/packages/flowy_infra_ui/.pub" />
+      <excludeFolder url="file://$MODULE_DIR$/app_flowy/packages/flowy_infra_ui/.dart_tool" />
+      <excludeFolder url="file://$MODULE_DIR$/app_flowy/packages/flowy_infra_ui/build" />
     </content>
     <orderEntry type="inheritedJdk" />
     <orderEntry type="sourceFolder" forTests="false" />
diff --git a/rust-lib/flowy-sdk/src/lib.rs b/rust-lib/flowy-sdk/src/lib.rs
index db7265177e..32595e2424 100644
--- a/rust-lib/flowy-sdk/src/lib.rs
+++ b/rust-lib/flowy-sdk/src/lib.rs
@@ -29,7 +29,7 @@ impl FlowySDK {
         FlowySDK::init_log(&self.root);
 
         tracing::info!("🔥 Root path: {}", self.root);
-        flowy_infra::kv::KVStore::init(&self.root);
+        let _ = flowy_infra::kv::KVStore::init(&self.root);
         FlowySDK::init_modules(&self.root, self.server);
     }
 
diff --git a/rust-lib/flowy-test/Cargo.toml b/rust-lib/flowy-test/Cargo.toml
index fc28e6525f..fb52d19629 100644
--- a/rust-lib/flowy-test/Cargo.toml
+++ b/rust-lib/flowy-test/Cargo.toml
@@ -9,6 +9,7 @@ edition = "2018"
 flowy-sdk = { path = "../flowy-sdk"}
 flowy-dispatch = { path = "../flowy-dispatch"}
 flowy-user = { path = "../flowy-user"}
+flowy-workspace = { path = "../flowy-workspace"}
 
 serde = { version = "1.0", features = ["derive"] }
 bincode = { version = "1.3"}
diff --git a/rust-lib/flowy-test/src/builder.rs b/rust-lib/flowy-test/src/builder.rs
index a100872fa0..271971cc80 100644
--- a/rust-lib/flowy-test/src/builder.rs
+++ b/rust-lib/flowy-test/src/builder.rs
@@ -1,46 +1,52 @@
-use crate::{helper::new_user_after_login, init_sdk, tester::Tester};
-use flowy_dispatch::prelude::{EventDispatch, FromBytes, ModuleRequest, ToBytes};
-use flowy_user::{entities::UserDetail, event::UserEvent::SignOut};
+use flowy_dispatch::prelude::{FromBytes, ToBytes};
+use flowy_user::entities::UserDetail;
 use std::{
     fmt::{Debug, Display},
     hash::Hash,
 };
 
-pub struct TestBuilder<Error> {
-    login: Option<bool>,
-    inner: Option<Tester<Error>>,
-    pub user_detail: Option<UserDetail>,
-}
+use crate::tester::{TesterContext, TesterTrait};
+use flowy_user::errors::UserError;
+use flowy_workspace::errors::WorkspaceError;
+use std::marker::PhantomData;
 
-impl<Error> TestBuilder<Error>
-where
-    Error: FromBytes + Debug,
-{
+pub type WorkspaceTestBuilder = TestBuilder<FixedUserTester<WorkspaceError>>;
+impl WorkspaceTestBuilder {
     pub fn new() -> Self {
-        TestBuilder::<Error> {
-            login: None,
-            inner: None,
+        Self {
+            tester: Box::new(FixedUserTester::<WorkspaceError>::new()),
             user_detail: None,
         }
     }
+}
 
+pub type UserTestBuilder = TestBuilder<RandomUserTester<UserError>>;
+impl UserTestBuilder {
+    pub fn new() -> Self {
+        Self {
+            tester: Box::new(RandomUserTester::<UserError>::new()),
+            user_detail: None,
+        }
+    }
+}
+
+pub struct TestBuilder<T: TesterTrait> {
+    pub tester: Box<T>,
+    pub user_detail: Option<UserDetail>,
+}
+
+impl<T> TestBuilder<T>
+where
+    T: TesterTrait,
+{
     pub fn login(mut self) -> Self {
-        let user_detail = new_user_after_login();
+        let user_detail = self.tester.login();
         self.user_detail = Some(user_detail);
         self
     }
 
     pub fn logout(self) -> Self {
-        init_sdk();
-        let _ = EventDispatch::sync_send(ModuleRequest::new(SignOut));
-        self
-    }
-
-    pub fn event<E>(mut self, event: E) -> Self
-    where
-        E: Eq + Hash + Debug + Clone + Display,
-    {
-        self.inner = Some(Tester::<Error>::new(event));
+        self.tester.logout();
         self
     }
 
@@ -48,12 +54,20 @@ where
     where
         P: ToBytes,
     {
-        self.inner.as_mut().unwrap().set_request(request);
+        self.tester.set_payload(request);
+        self
+    }
+
+    pub fn event<E>(mut self, event: E) -> Self
+    where
+        E: Eq + Hash + Debug + Clone + Display,
+    {
+        self.tester.set_event(event);
         self
     }
 
     pub fn sync_send(mut self) -> Self {
-        self.inner.as_mut().unwrap().sync_send();
+        self.tester.sync_send();
         self
     }
 
@@ -61,22 +75,70 @@ where
     where
         R: FromBytes,
     {
-        let inner = self.inner.take().unwrap();
-        inner.parse::<R>()
+        self.tester.parse::<R>()
     }
 
-    pub fn error(mut self) -> Error {
-        let inner = self.inner.take().unwrap();
-        inner.error()
-    }
+    pub fn error(mut self) -> <T as TesterTrait>::Error { self.tester.error() }
 
     pub fn assert_error(mut self) -> Self {
-        self.inner.as_mut().unwrap().assert_error();
+        self.tester.assert_error();
         self
     }
 
     pub fn assert_success(mut self) -> Self {
-        self.inner.as_mut().unwrap().assert_success();
+        self.tester.assert_success();
         self
     }
 }
+
+pub struct RandomUserTester<Error> {
+    context: TesterContext,
+    err_phantom: PhantomData<Error>,
+}
+
+impl<Error> RandomUserTester<Error>
+where
+    Error: FromBytes + Debug,
+{
+    pub fn new() -> Self {
+        Self {
+            context: TesterContext::default(),
+            err_phantom: PhantomData,
+        }
+    }
+}
+
+impl<Error> TesterTrait for RandomUserTester<Error>
+where
+    Error: FromBytes + Debug,
+{
+    type Error = Error;
+
+    fn context(&mut self) -> &mut TesterContext { &mut self.context }
+}
+
+pub struct FixedUserTester<Error> {
+    context: TesterContext,
+    err_phantom: PhantomData<Error>,
+}
+
+impl<Error> FixedUserTester<Error>
+where
+    Error: FromBytes + Debug,
+{
+    pub fn new() -> Self {
+        Self {
+            context: TesterContext::default(),
+            err_phantom: PhantomData,
+        }
+    }
+}
+
+impl<Error> TesterTrait for FixedUserTester<Error>
+where
+    Error: FromBytes + Debug,
+{
+    type Error = Error;
+
+    fn context(&mut self) -> &mut TesterContext { &mut self.context }
+}
diff --git a/rust-lib/flowy-test/src/helper.rs b/rust-lib/flowy-test/src/helper.rs
index 2ea710e809..88298e0a69 100644
--- a/rust-lib/flowy-test/src/helper.rs
+++ b/rust-lib/flowy-test/src/helper.rs
@@ -1,10 +1,3 @@
-use crate::{init_sdk, tester::Tester};
-use flowy_dispatch::prelude::*;
-use flowy_user::{
-    entities::{SignInRequest, UserDetail},
-    errors::UserError,
-    event::UserEvent::{SignIn, SignOut},
-};
 use std::{fs, path::PathBuf};
 
 pub fn root_dir() -> String {
@@ -23,21 +16,6 @@ pub fn root_dir() -> String {
     root_dir
 }
 
-pub fn new_user_after_login() -> UserDetail {
-    init_sdk();
-    let _ = EventDispatch::sync_send(ModuleRequest::new(SignOut));
-    let request = SignInRequest {
-        email: valid_email(),
-        password: valid_password(),
-    };
-
-    let mut tester = Tester::<UserError>::new(SignIn);
-    tester.set_request(request);
-    tester.sync_send();
-
-    tester.parse::<UserDetail>()
-}
-
 pub(crate) fn valid_email() -> String { "annie@appflowy.io".to_string() }
 
 pub(crate) fn valid_password() -> String { "HelloWorld!123".to_string() }
diff --git a/rust-lib/flowy-test/src/lib.rs b/rust-lib/flowy-test/src/lib.rs
index ebe11e7a66..b67859f336 100644
--- a/rust-lib/flowy-test/src/lib.rs
+++ b/rust-lib/flowy-test/src/lib.rs
@@ -1,13 +1,17 @@
-mod builder;
+pub mod builder;
 mod helper;
 mod tester;
 
 use crate::helper::root_dir;
 use flowy_sdk::FlowySDK;
-use std::{sync::Once, thread};
+use std::sync::Once;
 
 pub mod prelude {
-    pub use crate::{builder::TestBuilder, tester::Tester};
+    pub use crate::{
+        builder::{TestBuilder, *},
+        helper::*,
+        tester::Tester,
+    };
     pub use flowy_dispatch::prelude::*;
 }
 
diff --git a/rust-lib/flowy-test/src/tester.rs b/rust-lib/flowy-test/src/tester.rs
index faf8268058..a3807c572f 100644
--- a/rust-lib/flowy-test/src/tester.rs
+++ b/rust-lib/flowy-test/src/tester.rs
@@ -1,7 +1,14 @@
-use crate::init_sdk;
+use crate::{
+    helper::{valid_email, valid_password},
+    init_sdk,
+};
 use flowy_dispatch::prelude::*;
 pub use flowy_sdk::*;
-use flowy_user::prelude::*;
+use flowy_user::{
+    errors::UserError,
+    event::UserEvent::{SignIn, SignOut},
+    prelude::*,
+};
 use std::{
     convert::TryFrom,
     fmt::{Debug, Display},
@@ -89,32 +96,6 @@ where
     }
 }
 
-pub struct RandomUserTester<Error> {
-    context: TesterContext,
-    err_phantom: PhantomData<Error>,
-}
-
-impl<Error> RandomUserTester<Error>
-where
-    Error: FromBytes + Debug,
-{
-    pub fn new() -> Self {
-        Self {
-            context: TesterContext::default(),
-            err_phantom: PhantomData,
-        }
-    }
-}
-
-impl<Error> TesterTrait for RandomUserTester<Error>
-where
-    Error: FromBytes + Debug,
-{
-    type Error = Error;
-
-    fn context(&mut self) -> &mut TesterContext { &mut self.context }
-}
-
 pub struct TesterContext {
     request: Option<ModuleRequest>,
     status_code: StatusCode,
@@ -140,12 +121,20 @@ pub trait TesterTrait {
 
     fn assert_success(&mut self) { self.context().status_code = StatusCode::Ok; }
 
+    fn set_event<E>(&mut self, event: E)
+    where
+        E: Eq + Hash + Debug + Clone + Display,
+    {
+        init_sdk();
+        self.context().request = Some(ModuleRequest::new(event));
+    }
+
     fn set_payload<P>(&mut self, payload: P)
     where
         P: ToBytes,
     {
         let bytes = payload.into_bytes().unwrap();
-        let mut module_request = self.context().request.take().unwrap();
+        let module_request = self.context().request.take().unwrap();
         self.context().request = Some(module_request.payload(bytes));
     }
 
@@ -173,4 +162,23 @@ pub trait TesterTrait {
             .unwrap()
             .into_inner()
     }
+
+    fn login(&self) -> UserDetail {
+        init_sdk();
+        let _ = EventDispatch::sync_send(ModuleRequest::new(SignOut));
+        let request = SignInRequest {
+            email: valid_email(),
+            password: valid_password(),
+        };
+
+        let mut tester = Tester::<UserError>::new(SignIn);
+        tester.set_request(request);
+        tester.sync_send();
+        tester.parse::<UserDetail>()
+    }
+
+    fn logout(&self) {
+        init_sdk();
+        let _ = EventDispatch::sync_send(ModuleRequest::new(SignOut));
+    }
 }
diff --git a/rust-lib/flowy-user/tests/event/helper.rs b/rust-lib/flowy-user/tests/event/helper.rs
index 692d6c2d42..c415725bf6 100644
--- a/rust-lib/flowy-user/tests/event/helper.rs
+++ b/rust-lib/flowy-user/tests/event/helper.rs
@@ -1,7 +1,4 @@
-use flowy_test::prelude::TestBuilder;
-use flowy_user::errors::UserError;
-
-pub type UserTestBuilder = TestBuilder<UserError>;
+pub use flowy_test::builder::UserTestBuilder;
 
 pub(crate) fn invalid_email_test_case() -> Vec<String> {
     // https://gist.github.com/cjaoude/fd9910626629b53c4d25
diff --git a/rust-lib/flowy-user/tests/event/sign_in_test.rs b/rust-lib/flowy-user/tests/event/sign_in_test.rs
index 67817f874c..2d2793354d 100644
--- a/rust-lib/flowy-user/tests/event/sign_in_test.rs
+++ b/rust-lib/flowy-user/tests/event/sign_in_test.rs
@@ -1,5 +1,4 @@
 use crate::helper::*;
-
 use flowy_user::{errors::UserErrorCode, event::UserEvent::*, prelude::*};
 use serial_test::*;
 
diff --git a/rust-lib/flowy-user/tests/event/sign_up_test.rs b/rust-lib/flowy-user/tests/event/sign_up_test.rs
index e08b5dd061..9a1427491d 100644
--- a/rust-lib/flowy-user/tests/event/sign_up_test.rs
+++ b/rust-lib/flowy-user/tests/event/sign_up_test.rs
@@ -1,5 +1,4 @@
 use crate::helper::*;
-
 use flowy_user::{errors::*, event::UserEvent::*, prelude::*};
 use serial_test::*;
 
diff --git a/rust-lib/flowy-workspace/tests/event/helper.rs b/rust-lib/flowy-workspace/tests/event/helper.rs
index c4ecbb3435..9631890bfa 100644
--- a/rust-lib/flowy-workspace/tests/event/helper.rs
+++ b/rust-lib/flowy-workspace/tests/event/helper.rs
@@ -1,7 +1,4 @@
-use flowy_test::prelude::TestBuilder;
-use flowy_workspace::errors::WorkspaceError;
-
-pub type WorkspaceTestBuilder = TestBuilder<WorkspaceError>;
+pub use flowy_test::builder::WorkspaceTestBuilder;
 
 pub(crate) fn invalid_workspace_name_test_case() -> Vec<String> {
     vec!["", "1234".repeat(100).as_str()]