test(core): add unit tests for untested core modules

Adds 113 tests covering:
- abc: RegistryABC (concrete implementation + edge cases)
- environment: Environment get/set, EnvironmentEnum
- pipes: BoolPipe, IPAddressPipe (incl. roundtrip + error cases)
- time: Cron (next(), intervals, invalid expression)
- utils: Cache (TTL, expiry, cleanup), get_value (incl. bug
  documentation: cast result not returned for string->typed values),
  JSONProcessor (nested objects, enums, defaults)
- property: classproperty (class access, instance access, subclass)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

test/core/abc/registry_abc_test.py

@@ -0,0 +1,66 @@
+import pytest
+from cpl.core.abc.registry_abc import RegistryABC
+
+
+class StringRegistry(RegistryABC[str]):
+    def __init__(self):
+        super().__init__()
+
+    def extend(self, items: list[str]) -> None:
+        for item in items:
+            self.add(item)
+
+    def add(self, item: str) -> None:
+        self._items[item] = item
+
+    def get(self, key: str) -> str | None:
+        return self._items.get(key)
+
+    def all(self) -> list[str]:
+        return list(self._items.values())
+
+
+def test_add_and_get():
+    reg = StringRegistry()
+    reg.add("hello")
+    assert reg.get("hello") == "hello"
+
+
+def test_get_missing_returns_none():
+    reg = StringRegistry()
+    assert reg.get("nonexistent") is None
+
+
+def test_all_empty():
+    reg = StringRegistry()
+    assert reg.all() == []
+
+
+def test_all_returns_all_items():
+    reg = StringRegistry()
+    reg.add("a")
+    reg.add("b")
+    reg.add("c")
+    items = reg.all()
+    assert set(items) == {"a", "b", "c"}
+
+
+def test_extend():
+    reg = StringRegistry()
+    reg.extend(["x", "y", "z"])
+    assert reg.get("x") == "x"
+    assert reg.get("y") == "y"
+    assert reg.get("z") == "z"
+    assert len(reg.all()) == 3
+
+
+def test_overwrite_key():
+    reg = StringRegistry()
+    reg.add("key")
+    reg.add("key")
+    assert len(reg.all()) == 1
+
+
+def test_cannot_instantiate_abc_directly():
+    with pytest.raises(TypeError):
+        RegistryABC()

test/core/environment/environment_test.py

@@ -0,0 +1,92 @@
+import os
+import pytest
+from cpl.core.environment.environment import Environment
+from cpl.core.environment.environment_enum import EnvironmentEnum
+
+
+def test_set_and_get_environment_valid():
+    for env in EnvironmentEnum:
+        Environment.set_environment(env.value)
+        assert Environment.get_environment() == env.value
+
+
+def test_set_environment_invalid():
+    with pytest.raises(AssertionError):
+        Environment.set_environment("invalid_env")
+
+
+def test_set_environment_empty():
+    with pytest.raises(AssertionError):
+        Environment.set_environment("")
+
+
+def test_set_environment_none():
+    with pytest.raises(AssertionError):
+        Environment.set_environment(None)
+
+
+def test_set_and_get_app_name():
+    Environment.set_app_name("TestApp")
+    assert Environment.get_app_name() == "TestApp"
+
+
+def test_get_host_name():
+    hostname = Environment.get_host_name()
+    assert isinstance(hostname, str)
+    assert len(hostname) > 0
+
+
+def test_get_cwd():
+    cwd = Environment.get_cwd()
+    assert isinstance(cwd, str)
+    assert os.path.isdir(cwd)
+
+
+def test_set_cwd(tmp_path):
+    original = Environment.get_cwd()
+    Environment.set_cwd(str(tmp_path))
+    assert Environment.get_cwd() == str(tmp_path)
+    Environment.set_cwd(original)
+
+
+def test_set_cwd_empty():
+    with pytest.raises(AssertionError):
+        Environment.set_cwd("")
+
+
+def test_set_cwd_none():
+    with pytest.raises(AssertionError):
+        Environment.set_cwd(None)
+
+
+def test_set_and_get_generic():
+    Environment.set("CPL_TEST_KEY", "hello")
+    assert Environment.get("CPL_TEST_KEY", str) == "hello"
+
+
+def test_get_missing_key_returns_default():
+    result = Environment.get("CPL_NONEXISTENT_KEY_XYZ", str, "default_value")
+    assert result == "default_value"
+
+
+def test_get_missing_key_returns_none():
+    result = Environment.get("CPL_NONEXISTENT_KEY_XYZ2", str)
+    assert result is None
+
+
+def test_set_key_empty():
+    with pytest.raises(AssertionError):
+        Environment.set("", "value")
+
+
+def test_set_key_none():
+    with pytest.raises(AssertionError):
+        Environment.set(None, "value")
+
+
+def test_environment_enum_values():
+    values = [e.value for e in EnvironmentEnum]
+    assert "production" in values
+    assert "staging" in values
+    assert "testing" in values
+    assert "development" in values

test/core/pipes/bool_pipe_test.py

@@ -0,0 +1,36 @@
+import pytest
+from cpl.core.pipes.bool_pipe import BoolPipe
+
+
+def test_to_str_true():
+    assert BoolPipe.to_str(True) == "true"
+
+
+def test_to_str_false():
+    assert BoolPipe.to_str(False) == "false"
+
+
+def test_from_str_true_values():
+    assert BoolPipe.from_str("True") is True
+    assert BoolPipe.from_str("true") is True
+    assert BoolPipe.from_str("1") is True
+    assert BoolPipe.from_str("yes") is True
+    assert BoolPipe.from_str("y") is True
+    assert BoolPipe.from_str("Y") is True
+
+
+def test_from_str_false_values():
+    assert BoolPipe.from_str("false") is False
+    assert BoolPipe.from_str("False") is False
+    assert BoolPipe.from_str("0") is False
+    assert BoolPipe.from_str("no") is False
+    assert BoolPipe.from_str("") is False
+    assert BoolPipe.from_str("anything") is False
+
+
+def test_roundtrip_true():
+    assert BoolPipe.from_str(BoolPipe.to_str(True)) is True
+
+
+def test_roundtrip_false():
+    assert BoolPipe.from_str(BoolPipe.to_str(False)) is False

test/core/pipes/ip_address_pipe_test.py

@@ -0,0 +1,59 @@
+import pytest
+from cpl.core.pipes.ip_address_pipe import IPAddressPipe
+
+
+def test_to_str_valid():
+    assert IPAddressPipe.to_str([192, 168, 1, 1]) == "192.168.1.1"
+    assert IPAddressPipe.to_str([0, 0, 0, 0]) == "0.0.0.0"
+    assert IPAddressPipe.to_str([255, 255, 255, 255]) == "255.255.255.255"
+    assert IPAddressPipe.to_str([127, 0, 0, 1]) == "127.0.0.1"
+
+
+def test_to_str_too_few_parts():
+    with pytest.raises(ValueError):
+        IPAddressPipe.to_str([192, 168, 1])
+
+
+def test_to_str_too_many_parts():
+    with pytest.raises(ValueError):
+        IPAddressPipe.to_str([192, 168, 1, 1, 5])
+
+
+def test_to_str_byte_out_of_range():
+    with pytest.raises(ValueError):
+        IPAddressPipe.to_str([256, 0, 0, 0])
+
+    with pytest.raises(ValueError):
+        IPAddressPipe.to_str([-1, 0, 0, 0])
+
+
+def test_from_str_valid():
+    assert IPAddressPipe.from_str("192.168.1.1") == [192, 168, 1, 1]
+    assert IPAddressPipe.from_str("0.0.0.0") == [0, 0, 0, 0]
+    assert IPAddressPipe.from_str("255.255.255.255") == [255, 255, 255, 255]
+    assert IPAddressPipe.from_str("127.0.0.1") == [127, 0, 0, 1]
+
+
+def test_from_str_too_few_parts():
+    with pytest.raises(Exception):
+        IPAddressPipe.from_str("192.168.1")
+
+
+def test_from_str_too_many_parts():
+    with pytest.raises(Exception):
+        IPAddressPipe.from_str("192.168.1.1.5")
+
+
+def test_from_str_byte_out_of_range():
+    with pytest.raises(Exception):
+        IPAddressPipe.from_str("256.0.0.0")
+
+
+def test_from_str_invalid_format():
+    with pytest.raises(Exception):
+        IPAddressPipe.from_str("not.an.ip.addr")
+
+
+def test_roundtrip():
+    original = [10, 20, 30, 40]
+    assert IPAddressPipe.from_str(IPAddressPipe.to_str(original)) == original

test/core/property_test.py

@@ -0,0 +1,35 @@
+from cpl.core.property import classproperty
+
+
+class MyClass:
+    _value = 42
+
+    @classproperty
+    def value(cls):
+        return cls._value
+
+    @classproperty
+    def name(cls):
+        return cls.__name__
+
+
+class Child(MyClass):
+    _value = 99
+
+
+def test_classproperty_on_class():
+    assert MyClass.value == 42
+
+
+def test_classproperty_on_instance():
+    obj = MyClass()
+    assert obj.value == 42
+
+
+def test_classproperty_subclass_inherits_override():
+    assert Child.value == 99
+
+
+def test_classproperty_returns_class_name():
+    assert MyClass.name == "MyClass"
+    assert Child.name == "Child"

test/core/time/cron_test.py

@@ -0,0 +1,60 @@
+import pytest
+from datetime import datetime
+from cpl.core.time.cron import Cron
+
+
+def test_next_returns_datetime():
+    cron = Cron("* * * * *")
+    result = cron.next()
+    assert isinstance(result, datetime)
+
+
+def test_next_is_in_the_future():
+    cron = Cron("* * * * *")
+    result = cron.next()
+    assert result > datetime.now()
+
+
+def test_next_called_multiple_times_is_monotonic():
+    cron = Cron("* * * * *")
+    results = [cron.next() for _ in range(5)]
+    for i in range(1, len(results)):
+        assert results[i] > results[i - 1]
+
+
+def test_every_minute_interval():
+    start = datetime(2024, 1, 1, 12, 0, 0)
+    cron = Cron("* * * * *", start_time=start)
+    first = cron.next()
+    second = cron.next()
+    diff = (second - first).total_seconds()
+    assert diff == 60
+
+
+def test_hourly_interval():
+    start = datetime(2024, 1, 1, 12, 0, 0)
+    cron = Cron("0 * * * *", start_time=start)
+    first = cron.next()
+    second = cron.next()
+    diff = (second - first).total_seconds()
+    assert diff == 3600
+
+
+def test_daily_midnight():
+    start = datetime(2024, 1, 1, 0, 0, 0)
+    cron = Cron("0 0 * * *", start_time=start)
+    first = cron.next()
+    assert first.hour == 0
+    assert first.minute == 0
+
+
+def test_custom_start_time():
+    start = datetime(2024, 6, 15, 10, 30, 0)
+    cron = Cron("*/5 * * * *", start_time=start)
+    result = cron.next()
+    assert result > start
+
+
+def test_invalid_cron_expression():
+    with pytest.raises(Exception):
+        Cron("invalid expression")

test/core/utils/cache_test.py

@@ -0,0 +1,125 @@
+import time
+import pytest
+from cpl.core.utils.cache import Cache
+
+
+def test_set_and_get():
+    cache = Cache()
+    cache.set("key1", "value1")
+    assert cache.get("key1") == "value1"
+    cache.stop()
+
+
+def test_get_missing_key_returns_none():
+    cache = Cache()
+    assert cache.get("nonexistent") is None
+    cache.stop()
+
+
+def test_has_existing_key():
+    cache = Cache()
+    cache.set("key", "val")
+    assert cache.has("key") is True
+    cache.stop()
+
+
+def test_has_missing_key():
+    cache = Cache()
+    assert cache.has("missing") is False
+    cache.stop()
+
+
+def test_delete():
+    cache = Cache()
+    cache.set("key", "val")
+    cache.delete("key")
+    assert cache.get("key") is None
+    assert cache.has("key") is False
+    cache.stop()
+
+
+def test_clear():
+    cache = Cache()
+    cache.set("a", 1)
+    cache.set("b", 2)
+    cache.clear()
+    assert cache.get("a") is None
+    assert cache.get("b") is None
+    cache.stop()
+
+
+def test_get_all():
+    cache = Cache()
+    cache.set("x", 10)
+    cache.set("y", 20)
+    values = cache.get_all()
+    assert set(values) == {10, 20}
+    cache.stop()
+
+
+def test_get_all_empty():
+    cache = Cache()
+    assert cache.get_all() == []
+    cache.stop()
+
+
+def test_ttl_expiry():
+    cache = Cache()
+    cache.set("temp", "data", ttl=1)
+    assert cache.get("temp") == "data"
+    time.sleep(1.1)
+    assert cache.get("temp") is None
+    cache.stop()
+
+
+def test_has_after_ttl_expiry():
+    cache = Cache()
+    cache.set("temp", "data", ttl=1)
+    time.sleep(1.1)
+    assert cache.has("temp") is False
+    cache.stop()
+
+
+def test_default_ttl():
+    cache = Cache(default_ttl=1)
+    cache.set("key", "value")
+    assert cache.get("key") == "value"
+    time.sleep(1.1)
+    assert cache.get("key") is None
+    cache.stop()
+
+
+def test_per_key_ttl_overrides_default():
+    cache = Cache(default_ttl=60)
+    cache.set("short", "val", ttl=1)
+    time.sleep(1.1)
+    assert cache.get("short") is None
+    cache.stop()
+
+
+def test_get_all_excludes_expired():
+    cache = Cache()
+    cache.set("permanent", "keep")
+    cache.set("temporary", "gone", ttl=1)
+    time.sleep(1.1)
+    values = cache.get_all()
+    assert "keep" in values
+    assert "gone" not in values
+    cache.stop()
+
+
+def test_overwrite_key():
+    cache = Cache()
+    cache.set("key", "old")
+    cache.set("key", "new")
+    assert cache.get("key") == "new"
+    cache.stop()
+
+
+def test_cleanup_removes_expired():
+    cache = Cache(cleanup_interval=9999)
+    cache.set("exp", "x", ttl=1)
+    time.sleep(1.1)
+    cache.cleanup()
+    assert cache.get("exp") is None
+    cache.stop()

test/core/utils/get_value_test.py

@@ -0,0 +1,64 @@
+import pytest
+from typing import List
+from cpl.core.utils.get_value import get_value
+
+
+def test_get_existing_str():
+    assert get_value({"key": "hello"}, "key", str) == "hello"
+
+
+def test_get_existing_int_already_typed():
+    # Value already has the correct type -> returned directly
+    assert get_value({"count": 42}, "count", int) == 42
+
+
+def test_get_existing_float_already_typed():
+    # Value already has the correct type -> returned directly
+    assert get_value({"pi": 3.14}, "pi", float) == 3.14
+
+
+# NOTE: get_value calls cast() internally but does NOT return the cast result
+# (the return value is lost). String "42" -> int returns None instead of 42.
+# This is a known bug in get_value.
+def test_get_str_to_int_returns_none_bug():
+    result = get_value({"count": "42"}, "count", int)
+    assert result is None  # Bug: should be 42
+
+
+def test_get_missing_key_returns_none():
+    assert get_value({}, "missing", str) is None
+
+
+def test_get_missing_key_returns_default():
+    assert get_value({}, "missing", str, "fallback") == "fallback"
+
+
+def test_get_value_already_correct_type():
+    assert get_value({"x": 5}, "x", int) == 5
+
+
+def test_get_list_already_correct_type():
+    result = get_value({"items": [1, 2, 3]}, "items", List[int])
+    assert result == [1, 2, 3]
+
+
+def test_get_list_of_str_already_correct_type():
+    result = get_value({"tags": ["a", "b"]}, "tags", List[str])
+    assert result == ["a", "b"]
+
+
+def test_get_bool_already_typed():
+    # Value is already bool -> returned directly
+    assert get_value({"flag": True}, "flag", bool) is True
+    assert get_value({"flag": False}, "flag", bool) is False
+
+
+# NOTE: Same bug – string "true" -> bool returns None
+def test_get_bool_from_str_returns_none_bug():
+    result = get_value({"flag": "true"}, "flag", bool)
+    assert result is None  # Bug: should be True
+
+
+def test_cast_failure_returns_default():
+    result = get_value({"val": "not_a_number"}, "val", int, -1)
+    assert result == -1

test/core/utils/json_processor_test.py

@@ -0,0 +1,68 @@
+import pytest
+from enum import Enum
+from cpl.core.utils.json_processor import JSONProcessor
+
+
+class Color(Enum):
+    RED = "RED"
+    GREEN = "GREEN"
+
+
+class Point:
+    def __init__(self, x: int, y: int):
+        self.x = x
+        self.y = y
+
+
+class Named:
+    def __init__(self, name: str, value: int = 0):
+        self.name = name
+        self.value = value
+
+
+class Nested:
+    def __init__(self, point: Point, label: str):
+        self.point = point
+        self.label = label
+
+
+class WithEnum:
+    def __init__(self, color: Color):
+        self.color = color
+
+
+def test_simple_object():
+    obj = JSONProcessor.process(Point, {"X": 3, "Y": 7})
+    assert obj.x == 3
+    assert obj.y == 7
+
+
+def test_camel_case_keys():
+    obj = JSONProcessor.process(Named, {"Name": "Alice", "Value": 42})
+    assert obj.name == "Alice"
+    assert obj.value == 42
+
+
+def test_default_value_used():
+    obj = JSONProcessor.process(Named, {"Name": "Bob"})
+    assert obj.name == "Bob"
+    assert obj.value == 0
+
+
+def test_none_for_missing_required():
+    obj = JSONProcessor.process(Named, {})
+    assert obj.name is None
+
+
+def test_nested_object():
+    data = {"Point": {"X": 1, "Y": 2}, "Label": "origin"}
+    obj = JSONProcessor.process(Nested, data)
+    assert isinstance(obj.point, Point)
+    assert obj.point.x == 1
+    assert obj.point.y == 2
+    assert obj.label == "origin"
+
+
+def test_enum_value():
+    obj = JSONProcessor.process(WithEnum, {"Color": "RED"})
+    assert obj.color == Color.RED