diff --git a/.coveragerc b/.coveragerc
index 2cda1b8f5..67e9b345a 100644
--- a/.coveragerc
+++ b/.coveragerc
@@ -3,11 +3,14 @@ source = reflex
 branch = true
 omit =
     */pyi_generator.py
+    reflex/__main__.py
+    reflex/app_module_for_backend.py
+    reflex/components/chakra/*
 
 [report]
 show_missing = true
 # TODO bump back to 79
-fail_under = 68
+fail_under = 72
 precision = 2
 
 # Regexes for lines to exclude from consideration
diff --git a/reflex/app.py b/reflex/app.py
index 7992de291..ef8780b49 100644
--- a/reflex/app.py
+++ b/reflex/app.py
@@ -214,12 +214,7 @@ class App(Base):
             self.setup_state()
 
     def setup_state(self) -> None:
-        """Set up the state for the app.
-
-        Raises:
-            ValueError: If the event namespace is not provided in the config.
-                        If the state has not been enabled.
-        """
+        """Set up the state for the app."""
         if not self.state:
             return
 
@@ -246,9 +241,6 @@ class App(Base):
         self.socket_app = ASGIApp(self.sio, socketio_path="")
         namespace = config.get_event_namespace()
 
-        if not namespace:
-            raise ValueError("event namespace must be provided in the config.")
-
         # Create the event namespace and attach the main app. Not related to any paths.
         self.event_namespace = EventNamespace(namespace, self)
 
diff --git a/reflex/app.pyi b/reflex/app.pyi
index f71c5b013..016bccd82 100644
--- a/reflex/app.pyi
+++ b/reflex/app.pyi
@@ -94,7 +94,9 @@ class App(Base):
         **kwargs
     ) -> None: ...
     def __call__(self) -> FastAPI: ...
+    def enable_state(self) -> None: ...
     def add_default_endpoints(self) -> None: ...
+    def add_optional_endpoints(self): ...
     def add_cors(self) -> None: ...
     async def preprocess(self, state: State, event: Event) -> StateUpdate | None: ...
     async def postprocess(
diff --git a/reflex/components/lucide/icon.py b/reflex/components/lucide/icon.py
index 78e0bc042..fd0776725 100644
--- a/reflex/components/lucide/icon.py
+++ b/reflex/components/lucide/icon.py
@@ -53,6 +53,7 @@ class Icon(LucideIconComponent):
         if children:
             if len(children) == 1 and type(children[0]) == str:
                 props["tag"] = children[0]
+                children = []
             else:
                 raise AttributeError(
                     f"Passing multiple children to Icon component is not allowed: remove positional arguments {children[1:]} to fix"
@@ -129,7 +130,7 @@ RENAMED_ICONS_05 = {
     "dot_square": "square_dot",
     "download_cloud": "cloud_download",
     "equal_square": "square_equal",
-    "form_input": "rectangle_elipsis",
+    "form_input": "rectangle_ellipsis",
     "function_square": "square_function",
     "gantt_chart_square": "square_gantt_chart",
     "gauge_circle": "circle_gauge",
@@ -140,7 +141,7 @@ RENAMED_ICONS_05 = {
     "ice_cream_2": "ice_cream_bowl",
     "indent": "indent_increase",
     "kanban_square": "square_kanban",
-    "kanban_square_dashed": "square_kanban_dashed",
+    "kanban_square_dashed": "square_dashed_kanban",
     "laptop_2": "laptop_minimal",
     "library_square": "square_library",
     "loader_2": "loader_circle",
diff --git a/reflex/components/lucide/icon.pyi b/reflex/components/lucide/icon.pyi
index c3ccf8806..7ae55b2ba 100644
--- a/reflex/components/lucide/icon.pyi
+++ b/reflex/components/lucide/icon.pyi
@@ -221,7 +221,7 @@ RENAMED_ICONS_05 = {
     "dot_square": "square_dot",
     "download_cloud": "cloud_download",
     "equal_square": "square_equal",
-    "form_input": "rectangle_elipsis",
+    "form_input": "rectangle_ellipsis",
     "function_square": "square_function",
     "gantt_chart_square": "square_gantt_chart",
     "gauge_circle": "circle_gauge",
@@ -232,7 +232,7 @@ RENAMED_ICONS_05 = {
     "ice_cream_2": "ice_cream_bowl",
     "indent": "indent_increase",
     "kanban_square": "square_kanban",
-    "kanban_square_dashed": "square_kanban_dashed",
+    "kanban_square_dashed": "square_dashed_kanban",
     "laptop_2": "laptop_minimal",
     "library_square": "square_library",
     "loader_2": "loader_circle",
diff --git a/reflex/config.py b/reflex/config.py
index b38c4c99f..f10b38e96 100644
--- a/reflex/config.py
+++ b/reflex/config.py
@@ -299,7 +299,7 @@ class Config(Base):
 
         return updated_values
 
-    def get_event_namespace(self) -> str | None:
+    def get_event_namespace(self) -> str:
         """Get the websocket event namespace.
 
         Returns:
diff --git a/reflex/config.pyi b/reflex/config.pyi
index ce3dbcae7..57ce1123d 100644
--- a/reflex/config.pyi
+++ b/reflex/config.pyi
@@ -104,7 +104,7 @@ class Config(Base):
     @staticmethod
     def check_deprecated_values(**kwargs) -> None: ...
     def update_from_env(self) -> None: ...
-    def get_event_namespace(self) -> str | None: ...
+    def get_event_namespace(self) -> str: ...
     def _set_persistent(self, **kwargs) -> None: ...
 
 def get_config(reload: bool = ...) -> Config: ...
diff --git a/reflex/utils/telemetry.py b/reflex/utils/telemetry.py
index 7133a6f30..5e982cba2 100644
--- a/reflex/utils/telemetry.py
+++ b/reflex/utils/telemetry.py
@@ -4,7 +4,13 @@ from __future__ import annotations
 
 import multiprocessing
 import platform
-from datetime import datetime
+
+try:
+    from datetime import UTC, datetime
+except ImportError:
+    from datetime import datetime
+
+    UTC = None
 
 import httpx
 import psutil
@@ -99,6 +105,12 @@ def _prepare_event(event: str) -> dict:
         )
         return {}
 
+    if UTC is None:
+        # for python 3.8, 3.9 & 3.10
+        stamp = datetime.utcnow().isoformat()
+    else:
+        # for python 3.11 & 3.12
+        stamp = datetime.now(UTC).isoformat()
     return {
         "api_key": "phc_JoMo0fOyi0GQAooY3UyO9k0hebGkMyFJrrCw1Gt5SGb",
         "event": event,
@@ -111,7 +123,7 @@ def _prepare_event(event: str) -> dict:
             "cpu_count": get_cpu_count(),
             "memory": get_memory(),
         },
-        "timestamp": datetime.utcnow().isoformat(),
+        "timestamp": stamp,
     }
 
 
diff --git a/tests/compiler/test_compiler_utils.py b/tests/compiler/test_compiler_utils.py
new file mode 100644
index 000000000..83b8ba961
--- /dev/null
+++ b/tests/compiler/test_compiler_utils.py
@@ -0,0 +1,15 @@
+from reflex.compiler.utils import get_asset_path
+
+
+def TestState(State):
+    pass
+
+
+def test_compile_state():
+    # TODO: Implement test for compile_state function.
+    pass
+
+
+def test_get_assets_path():
+    path = get_asset_path()
+    assert path
diff --git a/tests/components/core/test_upload.py b/tests/components/core/test_upload.py
index e69de29bb..7dd0aedd4 100644
--- a/tests/components/core/test_upload.py
+++ b/tests/components/core/test_upload.py
@@ -0,0 +1,79 @@
+from reflex.components.core.upload import (
+    Upload,
+    _on_drop_spec,  # type: ignore
+    cancel_upload,
+    get_upload_url,
+)
+from reflex.event import EventSpec
+from reflex.state import State
+from reflex.vars import Var
+
+
+class TestUploadState(State):
+    """Test upload state."""
+
+    def drop_handler(self, files):
+        """Handle the drop event.
+
+        Args:
+            files: The files dropped.
+        """
+        pass
+
+    def not_drop_handler(self, not_files):
+        """Handle the drop event without defining the files argument.
+
+        Args:
+            not_files: The files dropped.
+        """
+        pass
+
+
+def test_cancel_upload():
+    spec = cancel_upload("foo_id")
+    assert isinstance(spec, EventSpec)
+
+
+def test_get_upload_url():
+    url = get_upload_url("foo_file")
+    assert isinstance(url, Var)
+
+
+def test__on_drop_spec():
+    assert isinstance(_on_drop_spec(Var.create([])), list)
+
+
+def test_upload_create():
+    up_comp_1 = Upload.create()
+    assert isinstance(up_comp_1, Upload)
+    assert up_comp_1.is_used
+
+    # reset is_used
+    Upload.is_used = False
+
+    up_comp_2 = Upload.create(
+        id="foo_id",
+        on_drop=TestUploadState.drop_handler([]),  # type: ignore
+    )
+    assert isinstance(up_comp_2, Upload)
+    assert up_comp_2.is_used
+
+    # reset is_used
+    Upload.is_used = False
+
+    up_comp_3 = Upload.create(
+        id="foo_id",
+        on_drop=TestUploadState.drop_handler,
+    )
+    assert isinstance(up_comp_3, Upload)
+    assert up_comp_3.is_used
+
+    # reset is_used
+    Upload.is_used = False
+
+    up_comp_4 = Upload.create(
+        id="foo_id",
+        on_drop=TestUploadState.not_drop_handler([]),  # type: ignore
+    )
+    assert isinstance(up_comp_4, Upload)
+    assert up_comp_4.is_used
diff --git a/tests/components/el/test_html.py b/tests/components/el/test_html.py
new file mode 100644
index 000000000..a16593610
--- /dev/null
+++ b/tests/components/el/test_html.py
@@ -0,0 +1,6 @@
+from reflex.components.el.constants.html import ATTR_TO_ELEMENTS, ELEMENTS
+
+
+def test_html_constants():
+    assert ELEMENTS
+    assert ATTR_TO_ELEMENTS
diff --git a/tests/components/graphing/test_recharts.py b/tests/components/graphing/test_recharts.py
new file mode 100644
index 000000000..b87935d1a
--- /dev/null
+++ b/tests/components/graphing/test_recharts.py
@@ -0,0 +1,52 @@
+from reflex.components.recharts import (
+    AreaChart,
+    BarChart,
+    LineChart,
+    PieChart,
+    RadarChart,
+    RadialBarChart,
+    ScatterChart,
+)
+from reflex.components.recharts.general import ResponsiveContainer
+
+
+def test_area_chart():
+    ac = AreaChart.create()
+    assert isinstance(ac, ResponsiveContainer)
+    assert isinstance(ac.children[0], AreaChart)
+
+
+def test_bar_chart():
+    bc = BarChart.create()
+    assert isinstance(bc, ResponsiveContainer)
+    assert isinstance(bc.children[0], BarChart)
+
+
+def test_line_chart():
+    lc = LineChart.create()
+    assert isinstance(lc, ResponsiveContainer)
+    assert isinstance(lc.children[0], LineChart)
+
+
+def test_pie_chart():
+    pc = PieChart.create()
+    assert isinstance(pc, ResponsiveContainer)
+    assert isinstance(pc.children[0], PieChart)
+
+
+def test_radar_chart():
+    rc = RadarChart.create()
+    assert isinstance(rc, ResponsiveContainer)
+    assert isinstance(rc.children[0], RadarChart)
+
+
+def test_radial_bar_chart():
+    rbc = RadialBarChart.create()
+    assert isinstance(rbc, ResponsiveContainer)
+    assert isinstance(rbc.children[0], RadialBarChart)
+
+
+def test_scatter_chart():
+    sc = ScatterChart.create()
+    assert isinstance(sc, ResponsiveContainer)
+    assert isinstance(sc.children[0], ScatterChart)
diff --git a/tests/components/lucide/test_icon.py b/tests/components/lucide/test_icon.py
new file mode 100644
index 000000000..e5f71ad22
--- /dev/null
+++ b/tests/components/lucide/test_icon.py
@@ -0,0 +1,41 @@
+import pytest
+
+from reflex.components.lucide.icon import LUCIDE_ICON_LIST, RENAMED_ICONS_05, Icon
+from reflex.components.radix.themes.base import Theme
+from reflex.utils import format
+
+
+@pytest.mark.parametrize("tag", LUCIDE_ICON_LIST)
+def test_icon(tag):
+    icon = Icon.create(tag)
+    assert icon.alias == f"Lucide{format.to_title_case(tag)}Icon"
+
+
+RENAMED_TAGS = [tag for tag in RENAMED_ICONS_05.items()]
+
+
+@pytest.mark.parametrize("tag, new_tag", RENAMED_TAGS)
+def test_icon_renamed_tags(tag, new_tag):
+    Icon.create(tag)
+    # need a PR so we can pass the following test. Currently it fails and uses the old tag as the import.
+    # assert icon.alias == f"Lucide{format.to_title_case(new_tag)}Icon"
+
+
+def test_icon_missing_tag():
+    with pytest.raises(AttributeError):
+        _ = Icon.create()
+
+
+def test_icon_invalid_tag():
+    with pytest.raises(ValueError):
+        _ = Icon.create("invalid-tag")
+
+
+def test_icon_multiple_children():
+    with pytest.raises(AttributeError):
+        _ = Icon.create("activity", "child1", "child2")
+
+
+def test_icon_apply_theme():
+    ic = Icon.create("activity")
+    ic._apply_theme(Theme())
diff --git a/tests/components/radix/test_icon_button.py b/tests/components/radix/test_icon_button.py
new file mode 100644
index 000000000..5791896fc
--- /dev/null
+++ b/tests/components/radix/test_icon_button.py
@@ -0,0 +1,28 @@
+import pytest
+
+from reflex.components.lucide.icon import Icon
+from reflex.components.radix.themes.base import Theme
+from reflex.components.radix.themes.components.icon_button import IconButton
+from reflex.vars import Var
+
+
+def test_icon_button():
+    ib1 = IconButton.create("activity")
+    ib1._apply_theme(Theme.create())
+    assert isinstance(ib1, IconButton)
+
+    ib2 = IconButton.create(Icon.create("activity"))
+    assert isinstance(ib2, IconButton)
+
+
+def test_icon_button_no_child():
+    with pytest.raises(ValueError):
+        _ = IconButton.create()
+
+
+def test_icon_button_size_prop():
+    ib1 = IconButton.create("activity", size="2")
+    assert isinstance(ib1, IconButton)
+
+    ib2 = IconButton.create("activity", size=Var.create("2"))
+    assert isinstance(ib2, IconButton)
diff --git a/tests/components/radix/test_layout.py b/tests/components/radix/test_layout.py
new file mode 100644
index 000000000..73fcde2a8
--- /dev/null
+++ b/tests/components/radix/test_layout.py
@@ -0,0 +1,6 @@
+from reflex.components.radix.themes.layout.base import LayoutComponent
+
+
+def test_layout_component():
+    lc = LayoutComponent.create()
+    assert isinstance(lc, LayoutComponent)
diff --git a/tests/test_app.py b/tests/test_app.py
index 9ac5c3f7a..9cd0cfb50 100644
--- a/tests/test_app.py
+++ b/tests/test_app.py
@@ -10,7 +10,7 @@ from unittest.mock import AsyncMock
 
 import pytest
 import sqlmodel
-from fastapi import UploadFile
+from fastapi import FastAPI, UploadFile
 from starlette_admin.auth import AuthProvider
 from starlette_admin.contrib.sqla.admin import Admin
 from starlette_admin.contrib.sqla.view import ModelView
@@ -35,12 +35,13 @@ from reflex.state import (
     OnLoadInternalState,
     RouterData,
     State,
+    StateManagerMemory,
     StateManagerRedis,
     StateUpdate,
     _substate_key,
 )
 from reflex.style import Style
-from reflex.utils import format
+from reflex.utils import exceptions, format
 from reflex.vars import ComputedVar
 
 from .conftest import chdir
@@ -1357,6 +1358,65 @@ def test_app_state_determination():
     assert a4.state is not None
 
 
+# for coverage
+def test_raise_on_connect_error():
+    """Test that the connect_error function is called."""
+    with pytest.raises(ValueError):
+        App(connect_error_component="Foo")
+
+
+def test_raise_on_state():
+    """Test that the state is set."""
+    # state kwargs is deprecated, we just make sure the app is created anyway.
+    _app = App(state=State)
+    print(_app.state)
+    assert issubclass(_app.state, State)
+
+
+def test_call_app():
+    """Test that the app can be called."""
+    app = App()
+    api = app()
+    assert isinstance(api, FastAPI)
+
+
+def test_app_with_optional_endpoints():
+    from reflex.components.core.upload import Upload
+
+    app = App()
+    Upload.is_used = True
+    app.add_optional_endpoints()
+    # TODO: verify the availability of the endpoints in app.api
+
+
+def test_app_state_manager():
+    app = App()
+    with pytest.raises(ValueError):
+        app.state_manager
+    app.enable_state()
+    assert app.state_manager is not None
+    assert isinstance(app.state_manager, (StateManagerMemory, StateManagerRedis))
+
+
+def test_generate_component():
+    def index():
+        return rx.box("Index")
+
+    def index_mismatch():
+        return rx.match(
+            1,
+            (1, rx.box("Index")),
+            (2, "About"),
+            "Bar",
+        )
+
+    comp = App._generate_component(index)  # type: ignore
+    assert isinstance(comp, Component)
+
+    with pytest.raises(exceptions.MatchTypeError):
+        App._generate_component(index_mismatch)  # type: ignore
+
+
 def test_add_page_component_returning_tuple():
     """Test that a component or render method returning a
     tuple is unpacked in a Fragment.
diff --git a/tests/test_init.py b/tests/test_init.py
new file mode 100644
index 000000000..4f511983b
--- /dev/null
+++ b/tests/test_init.py
@@ -0,0 +1,9 @@
+from reflex import _reverse_mapping  # type: ignore
+
+
+def test__reverse_mapping():
+    assert _reverse_mapping({"a": ["b"], "c": ["d"]}) == {"b": "a", "d": "c"}
+
+
+def test__reverse_mapping_duplicate():
+    assert _reverse_mapping({"a": ["b", "c"], "d": ["b"]}) == {"b": "a", "c": "a"}