Implement datetime handling in pytest-bdd

- This was awful and convoluted

Co-authored-by: Micah Jerome Ellison <micah.jerome.ellison@gmail.com>

tests/unit/test_override.py

@@ -0,0 +1,79 @@
+import pytest
+
+from jrnl.override import (
+    apply_overrides,
+    _recursively_apply,
+    _get_config_node,
+    _get_key_and_value_from_pair,
+    _convert_dots_to_list,
+)
+
+
+@pytest.fixture()
+def minimal_config():
+    cfg = {
+        "colors": {"body": "red", "date": "green"},
+        "default": "/tmp/journal.jrnl",
+        "editor": "vim",
+        "journals": {"default": "/tmp/journals/journal.jrnl"},
+    }
+    return cfg
+
+
+def test_apply_override(minimal_config):
+    overrides = [["editor", "nano"]]
+    apply_overrides(overrides, minimal_config)
+    assert minimal_config["editor"] == "nano"
+
+
+def test_override_dot_notation(minimal_config):
+    overrides = [["colors.body", "blue"]]
+
+    cfg = apply_overrides(overrides=overrides, base_config=minimal_config)
+    assert cfg["colors"] == {"body": "blue", "date": "green"}
+
+
+def test_multiple_overrides(minimal_config):
+    overrides = [
+        ["colors.title", "magenta"],
+        ["editor", "nano"],
+        ["journals.burner", "/tmp/journals/burner.jrnl"],
+    ]  # as returned by parse_args, saved in parser.config_override
+
+    cfg = apply_overrides(overrides, minimal_config)
+    assert cfg["editor"] == "nano"
+    assert cfg["colors"]["title"] == "magenta"
+    assert "burner" in cfg["journals"]
+    assert cfg["journals"]["burner"] == "/tmp/journals/burner.jrnl"
+
+
+def test_recursively_apply():
+    cfg = {"colors": {"body": "red", "title": "green"}}
+    cfg = _recursively_apply(cfg, ["colors", "body"], "blue")
+    assert cfg["colors"]["body"] == "blue"
+
+
+def test_get_config_node(minimal_config):
+    assert len(minimal_config.keys()) == 4
+    assert _get_config_node(minimal_config, "editor") == "vim"
+    assert _get_config_node(minimal_config, "display_format") == None
+
+
+def test_get_kv_from_pair():
+    pair = {"ab.cde": "fgh"}
+    k, v = _get_key_and_value_from_pair(pair)
+    assert k == "ab.cde"
+    assert v == "fgh"
+
+
+class TestDotNotationToList:
+    def test_unpack_dots_to_list(self):
+
+        keys = "a.b.c.d.e.f"
+        keys_list = _convert_dots_to_list(keys)
+        assert len(keys_list) == 6
+
+    def test_sequential_delimiters(self):
+        k = "g.r..h.v"
+        k_l = _convert_dots_to_list(k)
+        assert len(k_l) == 4