[WIP] operator implement

unittests/unittests_reactive_extenstions/observable_operator.py

@@ -0,0 +1,27 @@
+import traceback
+import unittest
+
+from cpl_core.console import Console
+from cpl_reactive_extensions.interval import Interval
+from cpl_reactive_extensions.operators.take import take
+
+
+class ObservableOperatorTestCase(unittest.TestCase):
+    def setUp(self):
+        self._error = False
+        self._completed = False
+
+    def _on_error(self, ex: Exception):
+        tb = traceback.format_exc()
+        Console.error(f"Got error from observable: {ex}", tb)
+        self._error = True
+
+    def _on_complete(self):
+        self._completed = True
+
+    def test_take_two(self):
+        def sub(x):
+            Console.write_line(x)
+
+        observable = Interval(1.0)
+        sub = observable.pipe(take(2)).subscribe(sub)