diff --git a/.github/workflows/unit.yml b/.github/workflows/unit.yml
index 9fc498b3..fc69f702 100644
--- a/.github/workflows/unit.yml
+++ b/.github/workflows/unit.yml
@@ -72,17 +72,19 @@ jobs:
           assert len(unexpected) == 0
       
       - name: test with pytest
-        run: coverage run -m pytest --color=yes --instafail tests
+        run: pytest --color=yes --cov --cov-report=xml --instafail tests
+        
+      - name: assess dead fixtures
+        if: matrix.python-version == '3.8'
+        run: pytest --dead-fixtures
         
       - name: build the template panel application 
         if: matrix.python-version == '3.8'
-        run: |
-          pytest --nbmake sepal_ui/templates/panel_app/ui.ipynb
+        run: pytest --nbmake sepal_ui/templates/panel_app/ui.ipynb
           
       - name: build the template map application 
         if: matrix.python-version == '3.8'
-        run: |
-          pytest --nbmake sepal_ui/templates/map_app/ui.ipynb
+        run: pytest --nbmake sepal_ui/templates/map_app/ui.ipynb
         
       - name: coverage
         run: coverage xml
diff --git a/sepal_ui/sepalwidgets/btn.py b/sepal_ui/sepalwidgets/btn.py
index 137622fa..105f6160 100644
--- a/sepal_ui/sepalwidgets/btn.py
+++ b/sepal_ui/sepalwidgets/btn.py
@@ -25,6 +25,9 @@ class Btn(v.Btn, SepalWidget):
 
     .. deprecated:: 2.13
         ``text`` and ``icon`` will be replaced by ``msg`` and ``gliph`` to avoid duplicating ipyvuetify trait.
+
+    .. deprecated:: 2.14
+        Btn is not using a default ``msg`` anymor`.
     """
 
     v_icon = None
@@ -36,7 +39,7 @@ class Btn(v.Btn, SepalWidget):
     msg = Unicode("").tag(sync=True)
     "traitlet.Unicode: the text of the btn"
 
-    def __init__(self, msg="Click", gliph="", **kwargs):
+    def __init__(self, msg="", gliph="", **kwargs):
 
         # deprecation in 2.13 of text and icon
         # as they already exist in the ipyvuetify Btn traits (as booleans)
@@ -55,7 +58,7 @@ class Btn(v.Btn, SepalWidget):
                 )
 
         # create the default v_icon
-        self.v_icon = v.Icon(left=True, children=[""])
+        self.v_icon = v.Icon(children=[""])
 
         # set the default parameters
         kwargs["color"] = kwargs.pop("color", "primary")
@@ -89,6 +92,7 @@ class Btn(v.Btn, SepalWidget):
         Set the text of the btn
         """
 
+        self.v_icon.left = bool(change["new"])
         self.children = [self.v_icon, change["new"]]
 
         return self
diff --git a/setup.py b/setup.py
index 84775ae4..e7ca3ccf 100644
--- a/setup.py
+++ b/setup.py
@@ -65,7 +65,7 @@ setup_params = {
         "cryptography",
         "python-box",
         "xyzservices",
-        "planet==2.0a2",  # this is a prerelease
+        "planet>=2.0",
         "pyyaml",
         "dask",
         "tqdm",
@@ -83,6 +83,8 @@ setup_params = {
             "pytest-sugar",
             "pytest-icdiff",
             "pytest-instafail",
+            "pytest-deadfixtures",
+            "pytest-cov",
             "nbmake ",
         ],
         "doc": [

diff --git a/tests/test_Btn.py b/tests/test_Btn.py
index fcaed760..4e3cb9b5 100644
--- a/tests/test_Btn.py
+++ b/tests/test_Btn.py
@@ -11,7 +11,7 @@ class TestBtn:
         btn = sw.Btn()
         assert btn.color == "primary"
         assert btn.v_icon.children[0] == ""
-        assert btn.children[1] == "Click"
+        assert btn.children[1] == ""
 
         # extensive btn
         btn = sw.Btn("toto", "fas fa-folder")
@@ -42,12 +42,18 @@ class TestBtn:
 
         assert isinstance(btn.v_icon, v.Icon)
         assert btn.v_icon.children[0] == gliph
+        assert btn.v_icon.left is True
 
         # change existing icon
         gliph = "fas fa-file"
         btn.gliph = gliph
         assert btn.v_icon.children[0] == gliph
 
+        # display only the gliph
+        btn.msg = ""
+        assert btn.children[1] == ""
+        assert btn.v_icon.left is False
+
         # remove all gliph
         gliph = ""
         btn.gliph = gliph
@@ -79,4 +85,4 @@ class TestBtn:
     def btn(self):
         """Create a simple btn"""
 
-        return sw.Btn()
+        return sw.Btn("Click")
diff --git a/tests/test_PlanetModel.py b/tests/test_PlanetModel.py
index f84d2e1f..d6d63c5a 100644
--- a/tests/test_PlanetModel.py
+++ b/tests/test_PlanetModel.py
@@ -9,11 +9,17 @@ from sepal_ui.planetapi import PlanetModel
 
 @pytest.mark.skipif("PLANET_API_KEY" not in os.environ, reason="requires Planet")
 class TestPlanetModel:
-    @pytest.mark.parametrize("credentials", ["planet_key", "cred"])
-    def test_init(self, credentials, request):
+    def test_init(self, planet_key, cred, request):
+
+        # Test with a valid api key
+        planet_model = PlanetModel(planet_key)
+
+        assert isinstance(planet_model, PlanetModel)
+        assert isinstance(planet_model.session, planet.http.Session)
+        assert planet_model.active is True
 
-        # Test with a valid api key and login credentials
-        planet_model = PlanetModel(request.getfixturevalue(credentials))
+        # Test with a valid login credentials
+        planet_model = PlanetModel(cred)
 
         assert isinstance(planet_model, PlanetModel)
         assert isinstance(planet_model.session, planet.http.Session)
@@ -56,10 +62,7 @@ class TestPlanetModel:
 
         return
 
-    def test_is_active(self, planet_key):
-
-        # We only need to test with a key.
-        planet_model = PlanetModel(planet_key)
+    def test_is_active(self, planet_model):
 
         planet_model._is_active()
         assert planet_model.active is True
@@ -69,9 +72,8 @@ class TestPlanetModel:
 
         return
 
-    def test_get_subscriptions(self, planet_key):
+    def test_get_subscriptions(self, planet_model):
 
-        planet_model = PlanetModel(planet_key)
         subs = planet_model.get_subscriptions()
 
         # Check object has length, because there is no way to check a value
@@ -80,10 +82,7 @@ class TestPlanetModel:
 
         return
 
-    def test_get_planet_items(self, planet_key):
-
-        # Arrange
-        planet_model = PlanetModel(planet_key)
+    def test_get_planet_items(self, planet_model):
 
         aoi = {  # Yasuni national park in Ecuador
             "type": "Polygon",
@@ -119,3 +118,11 @@ class TestPlanetModel:
         credentials = json.loads(os.getenv("PLANET_API_CREDENTIALS"))
 
         return list(credentials.values())
+
+    @pytest.fixture
+    def planet_model(self):
+        """Start a planet model using the API key"""
+
+        key = os.getenv("PLANET_API_KEY")
+
+        return PlanetModel(key)

sepal_ui.Btn does't work as expected 
I want to create a simple Icon button, to do so:

```python
sw.Btn(icon=True, gliph ="mdi-plus")
```
Doing this, without "msg" parameter will add the default text to the button which is "click", I think is worthless having that value.

So if I want to remove the default text, I would expect doing this:
```python
sw.Btn(children = [""], icon=True, gliph ="mdi-plus")
# or 
sw.Btn(msg= ""] icon=True, gliph ="mdi-plus")
```

Which leads the icon aligned to the left  and not centered (as it is using a empyt string as message).

tests/test_Btn.py::TestBtn::test_init tests/test_Btn.py::TestBtn::test_set_gliph
tests/test_Btn.py::TestBtn::test_toggle_loading tests/test_Btn.py::TestBtn::test_set_msg