add tests for print steps

tests/test_printing_steps.py

@@ -0,0 +1,37 @@
+import pytest
+from unittest.mock import patch
+from pennylane_calculquebec.processing.steps.print_steps import PrintResults, PrintTape
+
+class Tape:
+    def __init__(self, ops):
+        self.operations = ops
+
+
+class Op:
+    def __init__(self):
+        pass
+
+
+@pytest.fixture
+def mock_print():
+    with patch("builtins.print") as mock:
+        yield mock
+
+
+def test_print_tape(mock_print):
+    step = PrintTape()
+    tape = Tape(ops=[Op(), Op(), Op()])
+
+    new_tape = step.execute(tape)
+
+    assert tape is new_tape
+    mock_print.assert_called_once()
+
+def test_print_results(mock_print):
+    step = PrintResults()
+    tape = Tape(ops=[Op(), Op(), Op()])
+    results = {"0" : 0, "1" : 1, "2" : 2}
+
+    new_results = step.execute(tape, results)
+    assert results is new_results
+    mock_print.assert_called_once()