fix(tests): add test for Console widget

tests/unit_tests/test_console.py

@@ -0,0 +1,65 @@
+import sys
+import threading
+import time
+
+import pytest
+from pygments.token import Token
+from qtpy.QtCore import QEventLoop
+
+from bec_widgets.utils.colors import apply_theme
+from bec_widgets.widgets.editors.console.console import BECConsole
+
+
+@pytest.fixture
+def console_widget(qtbot):
+    apply_theme("light")
+    console = BECConsole()
+    console.set_cmd(sys.executable)  # will launch Python interpreter
+    console.set_prompt_tokens((Token.Prompt, ">>>"))
+    qtbot.addWidget(console)
+    console.show()
+    qtbot.waitExposed(console)
+    yield console
+    console.terminate()
+
+
+def test_console_widget(console_widget, qtbot, tmp_path):
+    def wait_prompt(command_to_execute=None, busy=False):
+        signal_waiter = QEventLoop()
+
+        def exit_loop(idle):
+            if busy and not idle:
+                signal_waiter.quit()
+            elif not busy and idle:
+                signal_waiter.quit()
+
+        console_widget.prompt.connect(exit_loop)
+        if command_to_execute:
+            if callable(command_to_execute):
+                command_to_execute()
+            else:
+                console_widget.execute_command(command_to_execute)
+        signal_waiter.exec_()
+
+    console_widget.start()
+    wait_prompt()
+
+    # use console to write something to a tmp file
+    tmp_filename = str(tmp_path / "console_test.txt")
+    wait_prompt(f"f = open('{tmp_filename}', 'wt'); f.write('HELLO CONSOLE'); f.close()")
+    # check the code has been executed by console, by checking the tmp file contents
+    with open(tmp_filename, "rt") as f:
+        assert f.read() == "HELLO CONSOLE"
+
+    # execute a sleep
+    t0 = time.perf_counter()
+    wait_prompt("import time; time.sleep(1)")
+    assert time.perf_counter() - t0 >= 1
+
+    # test ctrl-c
+    t0 = time.perf_counter()
+    wait_prompt("time.sleep(5)", busy=True)
+    wait_prompt(console_widget.send_ctrl_c)
+    assert (
+        time.perf_counter() - t0 < 1
+    )  # in reality it will be almost immediate, but ok we can say less than 1 second compared to 5