Rewrite tests with dash testing

.circleci/config.yml

@@ -1,6 +1,14 @@
 version: 2
 
 jobs:
+    "percy-finalize":
+        docker:
+            - image: percyio/agent
+              auth:
+                username: dashautomation
+                password: $DASH_PAT_DOCKERHUB
+        steps:
+            - run: percy finalize --all
     "node":
         docker:
             - image: circleci/node:8.11.3
@@ -38,6 +46,7 @@ jobs:
 
         environment:
             PERCY_ENABLED: True
+            PERCY_PARALLEL_TOTAL: -1
 
         steps:
             - checkout
@@ -81,28 +90,28 @@ jobs:
                 name: Integration Tests - Usage Apps Rendering
                 command: |
                     . venv/bin/activate
-                    python -m unittest tests.test_usage
+                    pytest --nopercyfinalize --headless tests/test_usage.py
                 when: always
 
             - run:
                 name: Integration Tests - Interactions
                 command: |
                     . venv/bin/activate
-                    python -m unittest tests.test_interactions
+                    pytest --headless tests/test_interactions.py
                 when: always
 
             - run:
                 name: Integration Tests - Callbacks
                 command: |
                     . venv/bin/activate
-                    python -m unittest tests.test_callbacks
+                    pytest --headless tests/test_callbacks.py
                 when: always
 
             - run:
                 name: Capture Percy Snapshots
                 command: |
                     . venv/bin/activate
-                    python -m unittest tests.test_percy_snapshot
+                    pytest --headless tests/test_percy_snapshot.py
                 when: always
 
     "python-3.7":
@@ -127,3 +136,6 @@ workflows:
                 context: dash-docker-hub
             - "node":
                 context: dash-docker-hub
+            - "percy-finalize":
+                requires:
+                    - "python-3.6"

tests/requirements.txt

@@ -8,8 +8,7 @@ ipdb
 percy
 selenium
 flake8
-pylint
-pytest-dash>=2.1.1
+pylint==2.9.*
 colour==0.1.5
 biopython>=1.77;python_version>="3.0"
 biopython==1.76;python_version=="2.7"

tests/screenshots/interactions/readme.md

@@ -0,0 +1,3 @@
+This is directory is reserved for screenshots generated by Selenium's webdriver in `test_usage.py`, during the CircleCI builds.
+
+Please do not add unecessary files to this directory (in fact, the only file should be this `readme.md`), and do not move this file.