diff --git a/compensation/tests/compensation/unit/test_forms.py b/compensation/tests/compensation/unit/test_forms.py
index 8e3eb15c..82fb90e8 100644
--- a/compensation/tests/compensation/unit/test_forms.py
+++ b/compensation/tests/compensation/unit/test_forms.py
@@ -14,16 +14,19 @@ from django.utils.timezone import now
 from django.utils.translation import gettext_lazy as _
 
 from codelist.models import KonovaCodeList
-from codelist.settings import CODELIST_COMPENSATION_ACTION_ID
+from codelist.settings import CODELIST_COMPENSATION_ACTION_ID, CODELIST_BIOTOPES_ID
 from compensation.forms.modals.compensation_action import NewCompensationActionModalForm, \
     EditCompensationActionModalForm, RemoveCompensationActionModalForm
 from compensation.forms.modals.deadline import NewDeadlineModalForm, EditDeadlineModalForm
+from compensation.forms.modals.state import NewCompensationStateModalForm, EditCompensationStateModalForm, \
+    RemoveCompensationStateModalForm
 from compensation.models import UnitChoices
 from konova.models import DeadlineType
 from konova.tests.test_views import BaseTestCase
 from konova.utils.generators import generate_random_string
 from konova.utils.message_templates import COMPENSATION_ACTION_EDITED, ADDED_COMPENSATION_ACTION, \
-    COMPENSATION_ACTION_REMOVED, ADDED_DEADLINE, DEADLINE_EDITED
+    COMPENSATION_ACTION_REMOVED, ADDED_DEADLINE, DEADLINE_EDITED, ADDED_COMPENSATION_STATE, COMPENSATION_STATE_EDITED, \
+    COMPENSATION_STATE_REMOVED
 from user.models import UserAction
 
 
@@ -247,3 +250,163 @@ class EditDeadlineModalFormTestCase(NewDeadlineModalFormTestCase):
         self.assertEqual(last_log.comment, DEADLINE_EDITED)
 
         self.assertIn(deadline, self.compensation.deadlines.all())
+
+
+class NewCompensationStateModalFormTestCase(BaseTestCase):
+    def setUp(self) -> None:
+        super().setUp()
+        self.request = RequestFactory().request()
+        self.request.user = self.superuser
+
+        self.comp_biotope_code = self.create_dummy_codes().first()
+        self.biotope_codelist = KonovaCodeList.objects.get_or_create(
+            id=CODELIST_BIOTOPES_ID
+        )[0]
+        self.biotope_codelist.codes.add(self.comp_biotope_code)
+
+    def test_init(self):
+        form = NewCompensationStateModalForm(request=self.request, instance=self.compensation)
+
+        self.assertEqual(form.form_title, str(_("New state")))
+        self.assertEqual(form.form_caption, str(_("Insert data for the new state")))
+        self.assertEqual(len(form.fields["biotope_type"].choices), 1)
+
+    def test_save(self):
+        test_surface = 123.45
+        data = {
+            "biotope_type": self.comp_biotope_code.id,
+            "biotope_extra": [],
+            "surface": test_surface,
+        }
+        self.assertEqual(self.compensation.before_states.count(), 0)
+        self.assertEqual(self.compensation.after_states.count(), 0)
+
+        form = NewCompensationStateModalForm(data, request=self.request, instance=self.compensation)
+
+        self.assertTrue(form.is_valid(), msg=form.errors)
+
+        is_before_state = True
+        state = form.save(is_before_state)
+
+        self.assertEqual(self.compensation.before_states.count(), 1)
+        self.assertEqual(self.compensation.after_states.count(), 0)
+        self.assertIn(state, self.compensation.before_states.all())
+        self.assertEqual(state.biotope_type, self.comp_biotope_code)
+        self.assertEqual(state.biotope_type_details.count(), 0)
+        self.assertEqual(float(state.surface), test_surface)
+
+        last_log = self.compensation.log.first()
+        self.assertEqual(last_log.user, self.superuser)
+        self.assertEqual(last_log.action, UserAction.EDITED)
+        self.assertEqual(last_log.comment, ADDED_COMPENSATION_STATE)
+
+        is_before_state = False
+        state = form.save(is_before_state)
+
+        self.assertEqual(self.compensation.before_states.count(), 1)
+        self.assertEqual(self.compensation.after_states.count(), 1)
+        self.assertIn(state, self.compensation.after_states.all())
+        self.assertEqual(state.biotope_type, self.comp_biotope_code)
+        self.assertEqual(state.biotope_type_details.count(), 0)
+        self.assertEqual(float(state.surface), test_surface)
+
+        last_log = self.compensation.log.first()
+        self.assertEqual(last_log.user, self.superuser)
+        self.assertEqual(last_log.action, UserAction.EDITED)
+        self.assertEqual(last_log.comment, ADDED_COMPENSATION_STATE)
+
+
+class EditCompensationStateModalFormTestCase(NewCompensationStateModalFormTestCase):
+    def setUp(self) -> None:
+        super().setUp()
+        self.comp_state.biotope_type = self.comp_biotope_code
+        self.comp_state.save()
+
+        self.compensation.after_states.add(self.comp_state)
+
+    def test_init(self):
+        form = EditCompensationStateModalForm(request=self.request, instance=self.compensation, state=self.comp_state)
+
+        self.assertEqual(form.state, self.comp_state)
+        self.assertEqual(form.form_title, str(_("Edit state")))
+        self.assertEqual(form.fields["biotope_type"].initial, self.comp_state.biotope_type.id)
+        self.assertTrue(
+            form.fields["biotope_extra"].initial.difference(
+                self.comp_state.biotope_type_details.all()
+            ).count() == 0
+        )
+        self.assertEqual(form.fields["surface"].initial, self.comp_state.surface)
+
+    def test_save(self):
+        test_surface = 987.65
+        test_code = self.create_dummy_codes().exclude(
+            id=self.comp_biotope_code.id
+        ).first()
+        self.biotope_codelist.codes.add(test_code)
+
+        self.assertEqual(self.compensation.after_states.count(), 1)
+        self.assertEqual(self.compensation.before_states.count(), 0)
+
+        data = {
+            "biotope_type": test_code.id,
+            "biotope_extra": [],
+            "surface": test_surface,
+        }
+        form = EditCompensationStateModalForm(
+            data,
+            request=self.request,
+            instance=self.compensation,
+            state=self.comp_state
+        )
+        self.assertTrue(form.is_valid(), msg=form.errors)
+
+        is_before_state = False
+        state = form.save(is_before_state=is_before_state)
+        self.assertEqual(state.biotope_type, test_code)
+        self.assertEqual(state.biotope_type_details.count(), 0)
+        self.assertEqual(float(state.surface), test_surface)
+
+        last_log = self.compensation.log.first()
+        self.assertEqual(last_log.action, UserAction.EDITED)
+        self.assertEqual(last_log.user, self.superuser)
+        self.assertEqual(last_log.comment, COMPENSATION_STATE_EDITED)
+
+class RemoveCompensationStateModalFormTestCase(EditCompensationStateModalFormTestCase):
+    def setUp(self) -> None:
+        super().setUp()
+
+    def test_init(self):
+        form = RemoveCompensationStateModalForm(request=self.request, instance=self.compensation, state=self.comp_state)
+
+        self.assertEqual(form.state, self.comp_state)
+
+    def test_save(self):
+        data = {
+            "confirm": True
+        }
+        form = RemoveCompensationStateModalForm(
+            data,
+            request=self.request,
+            instance=self.compensation,
+            state=self.comp_state
+        )
+        self.assertTrue(form.is_valid(), msg=form.errors)
+
+        self.assertIn(self.comp_state, self.compensation.after_states.all())
+        self.assertNotIn(self.comp_state, self.compensation.before_states.all())
+
+        form.save()
+
+        self.assertEqual(self.compensation.after_states.count(), 0)
+        self.assertEqual(self.compensation.before_states.count(), 0)
+        try:
+            self.comp_state.refresh_from_db()
+            self.fail("Entry should not existing anymore")
+        except ObjectDoesNotExist:
+            pass
+
+        last_log = self.compensation.log.first()
+        self.assertEqual(last_log.user, self.superuser)
+        self.assertEqual(last_log.action, UserAction.EDITED)
+        self.assertEqual(last_log.comment, COMPENSATION_STATE_REMOVED)
+