WIP: Add commands plugin with unit tests

.github/workflows/commands.yml

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+name: Commands Tests
+
+on:
+  push:
+    paths:
+      - '.github/workflows/commands.yml'
+      - '**.py'
+  pull_request:
+    paths:
+      - '.github/workflows/commands.yml'
+      - '**.py'
+
+jobs:
+  run-tests:
+    strategy:
+      fail-fast: false
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: SublimeText/UnitTesting/actions/setup@v1
+        with:
+          sublime-text-version: 4
+      - uses: SublimeText/UnitTesting/actions/run-tests@v1
+        with:
+          coverage: true
+      - uses: codecov/codecov-action@v3

Support/tests/test_commands.py

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+import sublime
+import sys
+from unittest import TestCase
+
+class TestConvertBetweenPropertyAndSignalHandler(TestCase):
+    def setUp(self):
+        self.view = sublime.active_window().new_file()
+        # make sure we have a window to work with
+        s = sublime.load_settings("Preferences.sublime-settings")
+        s.set("close_windows_when_empty", False)
+
+    def tearDown(self):
+        if self.view:
+            self.view.set_scratch(True)
+            w = self.view.window()
+            if w:
+                w.focus_view(self.view)
+                w.run_command("close_file")
+
+    def setText(self, string):
+        self.view.run_command("insert", {"characters": string})
+
+    def getRow(self, row):
+        return self.view.substr(self.view.line(self.view.text_point(row, 0)))
+
+    def test_hello_world(self):
+        self.setText("new ")
+        self.view.run_command("hello_world")
+        first_row = self.getRow(0)
+        self.assertEqual(first_row, "new hello world")

unittesting.json

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+{
+    "tests_dir": "Support/tests"
+}