diff --git a/.github/workflows/build-pipeline.yml b/.github/workflows/build-pipeline.yml
index 27cd1c6..33e0c61 100644
--- a/.github/workflows/build-pipeline.yml
+++ b/.github/workflows/build-pipeline.yml
@@ -8,7 +8,7 @@ on:
       - main
 jobs:
   build:
-    runs-on:  ${{ matrix.os }} 
+    runs-on:  ${{ matrix.os }}
     env:
       PYTHONIOENCODING: "utf8"
     strategy:
@@ -21,7 +21,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v5
         with:
-          python-version:  ${{ matrix.python-version }} 
+          python-version:  ${{ matrix.python-version }}
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
@@ -29,6 +29,8 @@ jobs:
       - name: Run Linting
         run: |
           ruff check .
+      - name: Set PYTHONPATH
+        run: echo "PYTHONPATH=$(pwd)" >> $GITHUB_ENV
       - name: Run Tests
         run: |
           pytest tests/
diff --git a/pyproject.toml b/pyproject.toml
index b587b28..ac40100 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -44,6 +44,7 @@ Icon = ""
 
 [tool.pytest.ini_options]
 minversion = "8.0"
+pythonpath = "src"
 testpaths = [
     "tests",
 ]
diff --git a/src/basic_data_handling/dict_nodes.py b/src/basic_data_handling/dict_nodes.py
index 8ddf05e..0ef23bb 100644
--- a/src/basic_data_handling/dict_nodes.py
+++ b/src/basic_data_handling/dict_nodes.py
@@ -67,7 +67,7 @@ def INPUT_TYPES(cls):
                 "key": ("STRING", {"default": ""}),
             },
             "optional": {
-                "default_value": ("*", {}),
+                "default": ("*", {}),
             }
         }
 
@@ -77,8 +77,8 @@ def INPUT_TYPES(cls):
     DESCRIPTION = cleandoc(__doc__ or "")
     FUNCTION = "get"
 
-    def get(self, input_dict: dict, key: str, default_value=None) -> tuple[Any]:
-        return (input_dict.get(key, default_value),)
+    def get(self, input_dict: dict, key: str, default=None) -> tuple[Any]:
+        return (input_dict.get(key, default),)
 
 
 class DictSet:
@@ -297,28 +297,24 @@ def INPUT_TYPES(cls):
             },
             "optional": {
                 "default_value": ("*", {}),
-                "has_default": (["False", "True"], {"default": "False"}),
             }
         }
 
-    RETURN_TYPES = ("DICT", "*", "BOOLEAN")
-    RETURN_NAMES = ("dict", "value", "key_found")
+    RETURN_TYPES = ("DICT", "*")
+    RETURN_NAMES = ("dict", "value")
     CATEGORY = "Basic/DICT"
     DESCRIPTION = cleandoc(__doc__ or "")
     FUNCTION = "pop"
 
-    def pop(self, input_dict: dict, key: str, default_value=None, has_default: str = "False") -> tuple[dict, Any, bool]:
+    def pop(self, input_dict: dict, key: str, default_value=None) -> tuple[dict, Any]:
         result = input_dict.copy()
-        has_default_bool = (has_default == "True")
 
         try:
             if key in result:
                 value = result.pop(key)
-                return result, value, True
-            elif has_default_bool:
-                return result, default_value, False
+                return result, value
             else:
-                raise KeyError(f"Key '{key}' not found in dictionary")
+                return result, default_value
         except Exception as e:
             raise ValueError(f"Error popping key from dictionary: {str(e)}")
 
@@ -376,7 +372,7 @@ def INPUT_TYPES(cls):
         }
 
     RETURN_TYPES = ("DICT", "*")
-    RETURN_NAMES = ("dict", "value")
+    RETURN_NAMES = ("DICT", "value")
     CATEGORY = "Basic/DICT"
     DESCRIPTION = cleandoc(__doc__ or "")
     FUNCTION = "setdefault"
@@ -605,7 +601,7 @@ def INPUT_TYPES(cls):
                 "keys": ("LIST", {}),
             },
             "optional": {
-                "default_value": ("*", {}),
+                "default": ("*", {}),
             }
         }
 
@@ -615,8 +611,8 @@ def INPUT_TYPES(cls):
     DESCRIPTION = cleandoc(__doc__ or "")
     FUNCTION = "get_multiple"
 
-    def get_multiple(self, input_dict: dict, keys: list, default_value=None) -> tuple[list]:
-        values = [input_dict.get(key, default_value) for key in keys]
+    def get_multiple(self, input_dict: dict, keys: list, default=None) -> tuple[list]:
+        values = [input_dict.get(key, default) for key in keys]
         return (values,)
 
 
@@ -736,40 +732,39 @@ def INPUT_TYPES(cls):
         }
 
     RETURN_TYPES = ("DICT", "BOOLEAN")
-    RETURN_NAMES = ("dict", "success")
     CATEGORY = "Basic/DICT"
     DESCRIPTION = cleandoc(__doc__ or "")
     FUNCTION = "convert"
 
-    def convert(self, input: Any) -> tuple[dict, bool]:
+    def convert(self, input: Any) -> tuple[dict]:
         try:
             if isinstance(input, dict):
-                return input.copy(), True
+                return (input.copy(),)
 
             # Try converting from items
             if hasattr(input, "items"):
-                return dict(input.items()), True
+                return (dict(input.items()),)
 
             # Try converting from sequence of pairs
             if hasattr(input, "__iter__") and not isinstance(input, str):
                 try:
                     result = dict(input)
-                    return result, True
+                    return (result,)
                 except (TypeError, ValueError):
                     pass
 
             # Check for to_dict or as_dict methods
             if hasattr(input, "to_dict") and callable(getattr(input, "to_dict")):
-                return input.to_dict(), True
+                return (input.to_dict(),)
 
             if hasattr(input, "as_dict") and callable(getattr(input, "as_dict")):
-                return input.as_dict(), True
+                return (input.as_dict(),)
 
             # Failed to convert
-            return {}, False
+            return ({},)
 
         except Exception:
-            return {}, False
+            return ({},)
 
 
 NODE_CLASS_MAPPINGS = {
diff --git a/src/basic_data_handling/list_nodes.py b/src/basic_data_handling/list_nodes.py
index c186227..99cd34f 100644
--- a/src/basic_data_handling/list_nodes.py
+++ b/src/basic_data_handling/list_nodes.py
@@ -347,9 +347,6 @@ def INPUT_TYPES(cls):
     FUNCTION = "slice"
 
     def slice(self, list: list[Any], start: int = 0, stop: int = -1, step: int = 1) -> tuple[list[Any]]:
-        if stop == -1:
-            stop = len(list)
-
         return (list[start:stop:step],)
 
 
diff --git a/tests/test_dict_nodes.py b/tests/test_dict_nodes.py
new file mode 100644
index 0000000..8428aed
--- /dev/null
+++ b/tests/test_dict_nodes.py
@@ -0,0 +1,193 @@
+#import pytest
+from src.basic_data_handling.dict_nodes import (
+    DictCreate,
+    DictCreateFromItems,
+    DictGet,
+    DictSet,
+    DictKeys,
+    DictValues,
+    DictItems,
+    DictContainsKey,
+    DictClear,
+    DictCopy,
+    DictFromKeys,
+    DictPop,
+    DictPopItem,
+    DictSetDefault,
+    DictUpdate,
+    DictLength,
+    DictMerge,
+    DictGetKeysValues,
+    DictRemove,
+    DictFilterByKeys,
+    DictExcludeKeys,
+    DictGetMultiple,
+    DictInvert,
+    DictCreateFromLists,
+    DictCompare,
+    AnyToDict,
+)
+
+def test_dict_create():
+    node = DictCreate()
+    assert node.create() == ({},)  # Creates an empty dictionary
+
+
+def test_dict_create_from_items():
+    node = DictCreateFromItems()
+    items = [("key1", "value1"), ("key2", "value2")]
+    assert node.create_from_items(items) == ({"key1": "value1", "key2": "value2"},)
+
+
+def test_dict_get():
+    node = DictGet()
+    my_dict = {"key1": "value1", "key2": "value2"}
+    assert node.get(my_dict, "key1") == ("value1",)
+    assert node.get(my_dict, "key3", default="default_value") == ("default_value",)
+
+
+def test_dict_set():
+    node = DictSet()
+    my_dict = {"key1": "value1"}
+    assert node.set(my_dict, "key2", "value2") == ({"key1": "value1", "key2": "value2"},)
+
+
+def test_dict_keys():
+    node = DictKeys()
+    my_dict = {"key1": "value1", "key2": "value2"}
+    assert node.keys(my_dict) == (["key1", "key2"],)
+
+
+def test_dict_values():
+    node = DictValues()
+    my_dict = {"key1": "value1", "key2": "value2"}
+    assert node.values(my_dict) == (["value1", "value2"],)
+
+
+def test_dict_items():
+    node = DictItems()
+    my_dict = {"key1": "value1", "key2": "value2"}
+    assert node.items(my_dict) == ([("key1", "value1"), ("key2", "value2")],)
+
+
+def test_dict_contains_key():
+    node = DictContainsKey()
+    my_dict = {"key1": "value1"}
+    assert node.contains_key(my_dict, "key1") == (True,)
+    assert node.contains_key(my_dict, "key2") == (False,)
+
+
+def test_dict_clear():
+    node = DictClear()
+    my_dict = {"key1": "value1"}
+    assert node.clear(my_dict) == ({},)
+
+
+def test_dict_copy():
+    node = DictCopy()
+    my_dict = {"key1": "value1"}
+    assert node.copy(my_dict) == ({"key1": "value1"},)
+
+
+def test_dict_from_keys():
+    node = DictFromKeys()
+    keys = ["key1", "key2"]
+    assert node.from_keys(keys, value="value") == ({"key1": "value", "key2": "value"},)
+
+
+def test_dict_pop():
+    node = DictPop()
+    my_dict = {"key1": "value1", "key2": "value2"}
+    assert node.pop(my_dict, "key1") == ({"key2": "value2"}, "value1")
+
+
+def test_dict_pop_item():
+    node = DictPopItem()
+    my_dict = {"key1": "value1"}
+    assert node.popitem(my_dict) == ({}, "key1", "value1", True)
+    assert node.popitem({}) == ({}, "", None, False)
+
+
+def test_dict_set_default():
+    node = DictSetDefault()
+    my_dict = {"key1": "value1"}
+    assert node.setdefault(my_dict, "key2", "default") == ({"key1": "value1", "key2": "default"}, "default")
+
+
+def test_dict_update():
+    node = DictUpdate()
+    my_dict = {"key1": "value1"}
+    update_dict = {"key2": "value2"}
+    assert node.update(my_dict, update_dict) == ({"key1": "value1", "key2": "value2"},)
+
+
+def test_dict_length():
+    node = DictLength()
+    my_dict = {"key1": "value1"}
+    assert node.length(my_dict) == (1,)
+
+
+def test_dict_merge():
+    node = DictMerge()
+    dict1 = {"key1": "value1"}
+    dict2 = {"key2": "value2"}
+    assert node.merge(dict1, dict2) == ({"key1": "value1", "key2": "value2"},)
+
+
+def test_dict_get_keys_values():
+    node = DictGetKeysValues()
+    my_dict = {"key1": "value1", "key2": "value2"}
+    assert node.get_keys_values(my_dict) == (["key1", "key2"], ["value1", "value2"])
+
+
+def test_dict_remove():
+    node = DictRemove()
+    my_dict = {"key1": "value1"}
+    assert node.remove(my_dict, "key1") == ({}, True)
+
+
+def test_dict_filter_by_keys():
+    node = DictFilterByKeys()
+    my_dict = {"key1": "value1", "key2": "value2"}
+    keys = ["key1"]
+    assert node.filter_by_keys(my_dict, keys) == ({"key1": "value1"},)
+
+
+def test_dict_exclude_keys():
+    node = DictExcludeKeys()
+    my_dict = {"key1": "value1", "key2": "value2"}
+    keys = ["key1"]
+    assert node.exclude_keys(my_dict, keys) == ({"key2": "value2"},)
+
+
+def test_dict_get_multiple():
+    node = DictGetMultiple()
+    my_dict = {"key1": "value1", "key2": "value2"}
+    keys = ["key1", "key3"]
+    assert node.get_multiple(my_dict, keys, default="default") == (["value1", "default"],)
+
+
+def test_dict_invert():
+    node = DictInvert()
+    my_dict = {"key1": "value1", "key2": "value2"}
+    assert node.invert(my_dict) == ({"value1": "key1", "value2": "key2"}, True)
+
+
+def test_dict_create_from_lists():
+    node = DictCreateFromLists()
+    keys = ["key1", "key2"]
+    values = ["value1", "value2"]
+    assert node.create_from_lists(keys, values) == ({"key1": "value1", "key2": "value2"},)
+
+
+def test_dict_compare():
+    node = DictCompare()
+    dict1 = {"key1": "value1"}
+    dict2 = {"key1": "value1"}
+    assert node.compare(dict1, dict2) == (True, [], [], [])
+
+
+def test_any_to_dict():
+    node = AnyToDict()
+    my_dict = {"key1": "value1"}
+    assert node.convert(my_dict) == ({"key1": "value1"},)
diff --git a/tests/test_float_nodes.py b/tests/test_float_nodes.py
new file mode 100644
index 0000000..1f548cb
--- /dev/null
+++ b/tests/test_float_nodes.py
@@ -0,0 +1,85 @@
+import pytest
+from src.basic_data_handling.float_nodes import (
+    FloatAdd,
+    FloatSubtract,
+    FloatMultiply,
+    FloatDivide,
+    FloatPower,
+    FloatRound,
+    FloatIsInteger,
+    FloatAsIntegerRatio,
+    FloatHex,
+    FloatFromHex,
+)
+
+def test_float_add():
+    node = FloatAdd()
+    assert node.add(2.2, 2.2) == (4.4,)
+    assert node.add(-1.5, 1.5) == (0.0,)
+    assert node.add(0.0, 0.0) == (0.0,)
+
+
+def test_float_subtract():
+    node = FloatSubtract()
+    assert node.subtract(5.5, 2.2) == (3.3,)
+    assert node.subtract(-1.5, 1.5) == (-3.0,)
+    assert node.subtract(0.0, 0.0) == (0.0,)
+
+
+def test_float_multiply():
+    node = FloatMultiply()
+    assert node.multiply(2.0, 3.5) == (7.0,)
+    assert node.multiply(-2.0, 3.0) == (-6.0,)
+    assert node.multiply(0.0, 5.0) == (0.0,)
+
+
+def test_float_divide():
+    node = FloatDivide()
+    assert node.divide(7.0, 2.0) == (3.5,)
+    assert node.divide(-6.0, 3.0) == (-2.0,)
+    with pytest.raises(ValueError, match="Cannot divide by zero."):
+        node.divide(5.0, 0.0)
+
+
+def test_float_power():
+    node = FloatPower()
+    assert node.power(2.0, 3.0) == (8.0,)
+    assert node.power(5.0, 0.0) == (1.0,)
+    assert node.power(-2.0, 3.0) == (-8.0,)
+
+
+def test_float_round():
+    node = FloatRound()
+    assert node.round(3.14159, 2) == (3.14,)
+    assert node.round(2.71828, 3) == (2.718,)
+    assert node.round(-1.2345, 1) == (-1.2,)
+    assert node.round(0.0, 0) == (0.0,)
+
+
+def test_float_is_integer():
+    node = FloatIsInteger()
+    assert node.is_integer(3.0) == (True,)
+    assert node.is_integer(3.14) == (False,)
+    assert node.is_integer(-2.0) == (True,)
+    assert node.is_integer(0.0) == (True,)
+
+
+def test_float_as_integer_ratio():
+    node = FloatAsIntegerRatio()
+    assert node.as_integer_ratio(3.5) == (7, 2)
+    assert node.as_integer_ratio(2.0) == (2, 1)
+    assert node.as_integer_ratio(-1.25) == (-5, 4)
+
+
+def test_float_hex():
+    node = FloatHex()
+    assert node.to_hex(3.5) == ("0x1.c000000000000p+1",)
+    assert node.to_hex(0.0) == ("0x0.0p+0",)
+    assert node.to_hex(-2.5) == ("-0x1.4000000000000p+1",)
+
+
+def test_float_from_hex():
+    node = FloatFromHex()
+    assert node.from_hex("0x1.c000000000000p+1") == (3.5,)
+    assert node.from_hex("0x0.0p+0") == (0.0,)
+    assert node.from_hex("-0x1.4000000000000p+1") == (-2.5,)
diff --git a/tests/test_int_nodes.py b/tests/test_int_nodes.py
new file mode 100644
index 0000000..1b34b02
--- /dev/null
+++ b/tests/test_int_nodes.py
@@ -0,0 +1,86 @@
+import pytest
+from src.basic_data_handling.int_nodes import (
+    IntAdd,
+    IntSubtract,
+    IntMultiply,
+    IntDivide,
+    IntModulus,
+    IntPower,
+    IntBitLength,
+    IntToBytes,
+    IntFromBytes,
+    IntBitCount,
+)
+
+
+def test_int_add():
+    node = IntAdd()
+    assert node.add(10, 5) == (15,)
+    assert node.add(-10, 5) == (-5,)
+    assert node.add(0, 0) == (0,)
+
+
+def test_int_subtract():
+    node = IntSubtract()
+    assert node.subtract(10, 5) == (5,)
+    assert node.subtract(5, 10) == (-5,)
+    assert node.subtract(0, 0) == (0,)
+
+
+def test_int_multiply():
+    node = IntMultiply()
+    assert node.multiply(10, 5) == (50,)
+    assert node.multiply(-1, 5) == (-5,)
+    assert node.multiply(0, 5) == (0,)
+
+
+def test_int_divide():
+    node = IntDivide()
+    assert node.divide(10, 2) == (5,)
+    assert node.divide(9, 4) == (2,)  # Integer division
+    with pytest.raises(ValueError, match="Cannot divide by zero."):
+        node.divide(10, 0)
+
+
+def test_int_modulus():
+    node = IntModulus()
+    assert node.modulus(10, 3) == (1,)
+    assert node.modulus(9, 9) == (0,)
+    with pytest.raises(ValueError, match="Cannot perform modulus operation by zero."):
+        node.modulus(10, 0)
+
+
+def test_int_power():
+    node = IntPower()
+    assert node.power(2, 3) == (8,)
+    assert node.power(10, 0) == (1,)  # Any number to the power 0 is 1
+    assert node.power(-2, 3) == (-8,)
+
+
+def test_int_bit_length():
+    node = IntBitLength()
+    assert node.bit_length(0) == (0,)  # Zero requires 0 bits
+    assert node.bit_length(1) == (1,)
+    assert node.bit_length(255) == (8,)  # 255 requires 8 bits
+    assert node.bit_length(-255) == (8,)  # Negative numbers have the same bit length
+
+
+def test_int_to_bytes():
+    node = IntToBytes()
+    assert node.to_bytes(255, 2, "big", "False") == (b"\x00\xff",)
+    assert node.to_bytes(255, 2, "little", "False") == (b"\xff\x00",)
+    assert node.to_bytes(-255, 2, "big", "True") == (b"\xff\x01",)
+
+
+def test_int_from_bytes():
+    node = IntFromBytes()
+    assert node.from_bytes(b"\x00\xff", "big", "False") == (255,)
+    assert node.from_bytes(b"\xff\x00", "little", "False") == (255,)
+    assert node.from_bytes(b"\xff\x01", "big", "True") == (-255,)
+
+
+def test_int_bit_count():
+    node = IntBitCount()
+    assert node.bit_count(0) == (0,)  # Zero has no 1 bits
+    assert node.bit_count(255) == (8,)  # 255 is 11111111 (8 ones)
+    assert node.bit_count(-255) == (8,)  # Negative integer has the same bit count
\ No newline at end of file
diff --git a/tests/test_list_nodes.py b/tests/test_list_nodes.py
new file mode 100644
index 0000000..0f97512
--- /dev/null
+++ b/tests/test_list_nodes.py
@@ -0,0 +1,139 @@
+import pytest
+from src.basic_data_handling.list_nodes import (
+    ListAppend,
+    ListExtend,
+    ListInsert,
+    ListRemove,
+    ListPop,
+    ListClear,
+    ListIndex,
+    ListCount,
+    ListSort,
+    ListReverse,
+    ListLength,
+    ListSlice,
+    ListGetItem,
+    ListSetItem,
+    ListContains,
+    ListMin,
+    ListMax
+)
+
+
+def test_list_append():
+    node = ListAppend()
+    assert node.append([1, 2, 3], 4) == ([1, 2, 3, 4],)
+    assert node.append([], "item") == (["item"],)
+    assert node.append(["a", "b"], {"key": "value"}) == (["a", "b", {"key": "value"}],)
+
+
+def test_list_extend():
+    node = ListExtend()
+    assert node.extend([1, 2], [3, 4]) == ([1, 2, 3, 4],)
+    assert node.extend([], [1, 2, 3]) == ([1, 2, 3],)
+    assert node.extend([1, 2], []) == ([1, 2],)
+
+
+def test_list_insert():
+    node = ListInsert()
+    assert node.insert([1, 3, 4], 1, 2) == ([1, 2, 3, 4],)
+    assert node.insert([], 0, "first") == (["first"],)
+    assert node.insert([1, 2], 10, "out_of_bounds") == ([1, 2, "out_of_bounds"],)
+
+
+def test_list_remove():
+    node = ListRemove()
+    assert node.remove([1, 2, 3, 2], 2) == ([1, 3, 2], True)
+    assert node.remove([1, 2, 3], 4) == ([1, 2, 3], False)
+    assert node.remove([], "not_in_list") == ([], False)
+
+
+def test_list_pop():
+    node = ListPop()
+    assert node.pop([1, 2, 3], 1) == ([1, 3], 2)
+    assert node.pop([1, 2, 3]) == ([1, 2], 3)  # Default: last item
+    assert node.pop([], 0) == ([], None)  # Empty list pop
+
+
+def test_list_clear():
+    node = ListClear()
+    assert node.clear([1, 2, 3]) == ([],)
+    assert node.clear([]) == ([],)
+
+
+def test_list_index():
+    node = ListIndex()
+    assert node.index([1, 2, 3, 2], 2) == (1,)
+    assert node.index([1, 2, 3, 2], 2, 2) == (3,)
+    assert node.index([1, 2, 3, 2], 4) == (-1,)
+
+
+def test_list_count():
+    node = ListCount()
+    assert node.count([1, 2, 3, 2], 2) == (2,)
+    assert node.count([], 1) == (0,)
+    assert node.count(["a", "b", "a"], "a") == (2,)
+
+
+def test_list_sort():
+    node = ListSort()
+    assert node.sort([3, 1, 2]) == ([1, 2, 3],)
+    assert node.sort([3, 1, 2], "True") == ([3, 2, 1],)  # Reverse
+    assert node.sort(["b", "a", "c"]) == (["a", "b", "c"],)
+    assert node.sort([1, "a"]) == ([1, "a"],)  # Unsortable list
+
+
+def test_list_reverse():
+    node = ListReverse()
+    assert node.reverse([1, 2, 3]) == ([3, 2, 1],)
+    assert node.reverse([]) == ([],)
+    assert node.reverse(["a", "b", "c"]) == (["c", "b", "a"],)
+
+
+def test_list_length():
+    node = ListLength()
+    assert node.length([1, 2, 3]) == (3,)
+    assert node.length([]) == (0,)
+    assert node.length(["a", "b", "c", "d"]) == (4,)
+
+
+def test_list_slice():
+    node = ListSlice()
+    assert node.slice([1, 2, 3, 4], 1, 3) == ([2, 3],)
+    assert node.slice([1, 2, 3, 4], 0, -1) == ([1, 2, 3],)
+    assert node.slice([1, 2, 3, 4], 0, 4, 2) == ([1, 3],)
+
+
+def test_list_get_item():
+    node = ListGetItem()
+    assert node.get_item([1, 2, 3], 0) == (1,)
+    assert node.get_item([1, 2, 3], -1) == (3,)
+    assert node.get_item([], 0) == (None,)
+
+
+def test_list_set_item():
+    node = ListSetItem()
+    assert node.set_item([1, 2, 3], 1, 42) == ([1, 42, 3],)
+    with pytest.raises(IndexError):
+        node.set_item([1, 2, 3], 3, 42) == ([1, 2, 3],)  # Out of range
+
+
+def test_list_contains():
+    node = ListContains()
+    assert node.contains([1, 2, 3], 2) == (True,)
+    assert node.contains([1, 2, 3], 4) == (False,)
+    assert node.contains([], "value") == (False,)
+
+
+def test_list_min():
+    node = ListMin()
+    assert node.find_min([1, 2, 3]) == (1,)
+    assert node.find_min(["b", "a", "c"]) == ("a",)
+    assert node.find_min([]) == (None,)
+
+
+def test_list_max():
+    node = ListMax()
+    assert node.find_max([1, 2, 3]) == (3,)
+    assert node.find_max(["b", "a", "c"]) == ("c",)
+    assert node.find_max([]) == (None,)
diff --git a/tests/test_math_nodes.py b/tests/test_math_nodes.py
new file mode 100644
index 0000000..5918e9f
--- /dev/null
+++ b/tests/test_math_nodes.py
@@ -0,0 +1,148 @@
+import pytest
+import math
+from src.basic_data_handling.math_nodes import (
+    MathSin, MathCos, MathTan, MathAsin, MathAcos, MathAtan, MathAtan2,
+    MathSqrt, MathExp, MathLog, MathLog10, MathDegrees, MathRadians,
+    MathFloor, MathCeil, MathAbs, MathPi, MathE, MathMin, MathMax,
+)
+
+
+def test_math_sin():
+    node = MathSin()
+    assert node.calculate(0, "radians") == (0.0,)
+    assert node.calculate(math.pi / 2, "radians") == (1.0,)
+    assert node.calculate(30, "degrees") == (math.sin(math.radians(30)),)
+
+
+def test_math_cos():
+    node = MathCos()
+    assert node.calculate(0, "radians") == (1.0,)
+    assert node.calculate(math.pi, "radians") == (-1.0,)
+    assert node.calculate(60, "degrees") == (math.cos(math.radians(60)),)
+
+
+def test_math_tan():
+    node = MathTan()
+    assert node.calculate(0, "radians") == (0.0,)
+    assert node.calculate(45, "degrees") == (math.tan(math.radians(45)),)
+    with pytest.raises(ValueError):  # Undefined tangent
+        node.calculate(90, "degrees")
+
+
+def test_math_asin():
+    node = MathAsin()
+    assert node.calculate(0, "radians") == (0.0,)
+    assert node.calculate(1, "radians") == (math.pi / 2,)
+    assert node.calculate(0.5, "degrees") == (math.degrees(math.asin(0.5)),)
+
+
+def test_math_acos():
+    node = MathAcos()
+    assert node.calculate(1, "radians") == (0.0,)
+    assert node.calculate(0, "radians") == (math.pi / 2,)
+    assert node.calculate(0.5, "degrees") == (math.degrees(math.acos(0.5)),)
+
+
+def test_math_atan():
+    node = MathAtan()
+    assert node.calculate(0, "radians") == (0.0,)
+    assert node.calculate(1, "degrees") == (45.0,)
+    assert node.calculate(-1, "radians") == (-math.pi / 4,)
+
+
+def test_math_atan2():
+    node = MathAtan2()
+    assert node.calculate(0, 1, "radians") == (0.0,)
+    assert node.calculate(1, 1, "degrees") == (45.0,)
+    assert node.calculate(-1, -1, "radians") == (-3 * math.pi / 4,)
+
+
+def test_math_sqrt():
+    node = MathSqrt()
+    assert node.calculate(4) == (2.0,)
+    assert node.calculate(0) == (0.0,)
+    with pytest.raises(ValueError):  # Negative numbers
+        node.calculate(-1)
+
+
+def test_math_exp():
+    node = MathExp()
+    assert node.calculate(0) == (1.0,)
+    assert node.calculate(1) == (math.e,)
+    assert node.calculate(-1) == (1 / math.e,)
+
+
+def test_math_log():
+    node = MathLog()
+    assert node.calculate(1) == (0.0,)
+    assert node.calculate(math.e) == (1.0,)
+    assert node.calculate(8, base=2) == (3.0,)
+    with pytest.raises(ValueError):  # Log of non-positive
+        node.calculate(-1)
+
+
+def test_math_log10():
+    node = MathLog10()
+    assert node.calculate(1) == (0.0,)
+    assert node.calculate(10) == (1.0,)
+    with pytest.raises(ValueError):  # Log of non-positive
+        node.calculate(0)
+
+
+def test_math_degrees():
+    node = MathDegrees()
+    assert node.calculate(math.pi) == (180.0,)
+    assert node.calculate(math.pi / 2) == (90.0,)
+    assert node.calculate(0) == (0.0,)
+
+
+def test_math_radians():
+    node = MathRadians()
+    assert node.calculate(180) == (math.pi,)
+    assert node.calculate(90) == (math.pi / 2,)
+    assert node.calculate(0) == (0.0,)
+
+
+def test_math_floor():
+    node = MathFloor()
+    assert node.calculate(1.7) == (1,)
+    assert node.calculate(-1.7) == (-2,)
+    assert node.calculate(0.0) == (0,)
+
+
+def test_math_ceil():
+    node = MathCeil()
+    assert node.calculate(1.2) == (2,)
+    assert node.calculate(-1.2) == (-1,)
+    assert node.calculate(0.0) == (0,)
+
+
+def test_math_abs():
+    node = MathAbs()
+    assert node.calculate(-5) == (5,)
+    assert node.calculate(5) == (5,)
+    assert node.calculate(0) == (0,)
+
+
+def test_math_pi():
+    node = MathPi()
+    assert node.calculate() == (math.pi,)
+
+
+def test_math_e():
+    node = MathE()
+    assert node.calculate() == (math.e,)
+
+
+def test_math_min():
+    node = MathMin()
+    assert node.calculate(5, 10) == (5,)
+    assert node.calculate(-1, 0) == (-1,)
+    assert node.calculate(3.5, 2.5) == (2.5,)
+
+
+def test_math_max():
+    node = MathMax()
+    assert node.calculate(5, 10) == (10,)
+    assert node.calculate(-1, 0) == (0,)
+    assert node.calculate(3.5, 2.5) == (3.5,)
diff --git a/tests/test_path_nodes.py b/tests/test_path_nodes.py
new file mode 100644
index 0000000..62fc962
--- /dev/null
+++ b/tests/test_path_nodes.py
@@ -0,0 +1,181 @@
+import os
+import pytest
+
+from src.basic_data_handling.path_nodes import (
+    PathJoin, PathAbspath, PathExists, PathIsFile, PathIsDir, PathGetSize,
+    PathSplit, PathSplitExt, PathBasename, PathDirname, PathGetExtension,
+    PathNormalize, PathRelative, PathGlob, PathExpandVars, PathGetCwd,
+    PathListDir, PathIsAbsolute, PathCommonPrefix,
+)
+
+
+def test_path_join():
+    node = PathJoin()
+    assert node.join_paths("folder", "file.txt") == (os.path.join("folder", "file.txt"),)
+    assert node.join_paths("folder", "") == (os.path.join("folder"),)
+    assert node.join_paths(".", "") == (".",)
+
+
+def test_path_abspath():
+    node = PathAbspath()
+    assert node.get_abspath(".") == (os.path.abspath("."),)
+    assert node.get_abspath("folder/file.txt") == (os.path.abspath("folder/file.txt"),)
+
+
+def test_path_exists(tmp_path):
+    node = PathExists()
+    existing_file = tmp_path / "file.txt"
+    existing_file.write_text("content")
+
+    assert node.check_exists(str(existing_file)) == (True,)
+    assert node.check_exists("nonexistent.file") == (False,)
+
+
+def test_path_is_file(tmp_path):
+    node = PathIsFile()
+    file = tmp_path / "file.txt"
+    file.write_text("content")
+    directory = tmp_path / "directory"
+    directory.mkdir()
+
+    assert node.check_is_file(str(file)) == (True,)
+    assert node.check_is_file(str(directory)) == (False,)
+    assert node.check_is_file("nonexistent.file") == (False,)
+
+
+def test_path_is_dir(tmp_path):
+    node = PathIsDir()
+    directory = tmp_path / "directory"
+    directory.mkdir()
+    file = tmp_path / "file.txt"
+    file.write_text("content")
+
+    assert node.check_is_dir(str(directory)) == (True,)
+    assert node.check_is_dir(str(file)) == (False,)
+    assert node.check_is_dir("nonexistent.dir") == (False,)
+
+
+def test_path_get_size(tmp_path):
+    node = PathGetSize()
+    file = tmp_path / "file.txt"
+    file.write_text("content")
+
+    assert node.get_size(str(file)) == (len("content"),)
+
+    with pytest.raises(FileNotFoundError):
+        node.get_size("nonexistent.file")
+
+    directory = tmp_path / "directory"
+    directory.mkdir()
+
+    with pytest.raises(ValueError):
+        node.get_size(str(directory))
+
+
+def test_path_split():
+    node = PathSplit()
+    path = os.path.join("folder", "file.txt")
+
+    assert node.split_path(path) == (os.path.dirname(path), os.path.basename(path))
+    assert node.split_path("file.txt") == ("", "file.txt")
+
+
+def test_path_splitext():
+    node = PathSplitExt()
+    assert node.split_ext("file.txt") == ("file", ".txt")
+    assert node.split_ext("file") == ("file", "")
+
+
+def test_path_basename():
+    node = PathBasename()
+    assert node.get_basename("folder/file.txt") == ("file.txt",)
+    assert node.get_basename("file.txt") == ("file.txt",)
+
+
+def test_path_dirname():
+    node = PathDirname()
+    assert node.get_dirname("folder/file.txt") == ("folder",)
+    assert node.get_dirname("file.txt") == ("",)
+
+
+def test_path_get_extension():
+    node = PathGetExtension()
+    assert node.get_extension("file.txt") == (".txt",)
+    assert node.get_extension("file") == ("",)
+
+
+def test_path_normalize():
+    node = PathNormalize()
+    assert node.normalize_path("folder/../file.txt") == (os.path.normpath("folder/../file.txt"),)
+    assert node.normalize_path("folder//file.txt") == (os.path.normpath("folder//file.txt"),)
+
+
+def test_path_relative(tmp_path):
+    node = PathRelative()
+    start = tmp_path / "start"
+    start.mkdir()
+    target = tmp_path / "start/target"
+    target.mkdir()
+
+    assert node.get_relative_path(str(target), str(start)) == (os.path.relpath(str(target), str(start)),)
+    assert node.get_relative_path(str(target)) == (os.path.relpath(str(target), os.getcwd()),)
+
+
+def test_path_glob(tmp_path):
+    node = PathGlob()
+    (tmp_path / "file1.txt").write_text("content")
+    (tmp_path / "file2.txt").write_text("content")
+    (tmp_path / "file3.txt").write_text("content")
+
+    result = node.glob_paths(str(tmp_path / "*.txt"))
+    expected = sorted([str(tmp_path / f"file{i}.txt") for i in range(1, 4)])
+
+    assert sorted(result[0]) == expected
+
+    recursive_node = PathGlob()
+    assert recursive_node.glob_paths(str(tmp_path), recursive="True")[0]
+
+
+def test_path_expand_vars(monkeypatch):
+    node = PathExpandVars()
+    monkeypatch.setenv("TEST_VAR", "test_value")
+
+    assert node.expand_vars("$TEST_VAR/path") == ("test_value/path",)
+    assert node.expand_vars("${TEST_VAR}/path") == ("test_value/path",)
+
+
+def test_path_get_cwd():
+    node = PathGetCwd()
+    assert node.get_cwd() == (os.getcwd(),)
+
+
+def test_path_list_dir(tmp_path):
+    node = PathListDir()
+    (tmp_path / "file1.txt").write_text("content")
+    (tmp_path / "dir1").mkdir()
+
+    all_entries = node.list_directory(str(tmp_path))
+    assert "file1.txt" in all_entries[0]
+    assert "dir1" in all_entries[0]
+
+    only_files = node.list_directory(str(tmp_path), files_only="True")
+    assert "file1.txt" in only_files[0]
+    assert "dir1" not in only_files[0]
+
+    only_dirs = node.list_directory(str(tmp_path), dirs_only="True")
+    assert "file1.txt" not in only_dirs[0]
+    assert "dir1" in only_dirs[0]
+
+
+def test_path_is_absolute():
+    node = PathIsAbsolute()
+    assert node.check_is_absolute("/") == (True,)
+    assert node.check_is_absolute("relative/path") == (False,)
+
+
+def test_path_common_prefix():
+    node = PathCommonPrefix()
+    path1 = "/path/to/file1.txt"
+    path2 = "/path/to/file2.txt"
+
+    assert node.get_common_prefix(path1, path2) == (os.path.commonprefix([path1, path2]),)
diff --git a/tests/test_regex_nodes.py b/tests/test_regex_nodes.py
new file mode 100644
index 0000000..6f2335f
--- /dev/null
+++ b/tests/test_regex_nodes.py
@@ -0,0 +1,58 @@
+#import pytest
+from src.basic_data_handling.regex_nodes import (
+    RegexSearchGroups,
+    RegexGroupDict,
+    RegexFindall,
+    RegexSplit,
+    RegexSub,
+    RegexTest
+)
+
+def test_regex_search_groups():
+    node = RegexSearchGroups()
+    assert node.search_groups(r"(foo)(bar)", "foobar") == (["foo", "bar"],)
+    assert node.search_groups(r"(test)(\d+)", "test123") == (["test", "123"],)
+    assert node.search_groups(r"(nothing)", "no match here") == ([],)  # No match
+    assert node.search_groups(r"(\w+)", "word") == (["word"],)  # Single group
+
+
+def test_regex_group_dict():
+    node = RegexGroupDict()
+    pattern = r"(?P<word>\w+)-(?P<number>\d+)"
+    string = "test-123"
+    assert node.groupdict(pattern, string) == ({"word": "test", "number": "123"},)
+    assert node.groupdict(pattern, "no-match") == ({},)  # No match
+    assert node.groupdict(r"(?P<name>\w+)", "Example") == ({"name": "Example"},)
+
+
+def test_regex_findall():
+    node = RegexFindall()
+    assert node.findall(r"\d+", "abc 123 def 456") == (["123", "456"],)
+    assert node.findall(r"\b[a-zA-Z]+\b", "Multiple words here") == (["Multiple", "words", "here"],)
+    assert node.findall(r"nonexistent", "no match") == ([],)  # No match
+    assert node.findall(r"(a)(b)", "ab ab") == ([("a", "b"), ("a", "b")],)  # Multiple groups
+
+
+def test_regex_split():
+    node = RegexSplit()
+    pattern = r",\s*"
+    string = "one, two, three"
+    assert node.split(pattern, string) == (["one", "two", "three"],)
+    assert node.split(r"\s+", "split several words") == (["split", "several", "words"],)  # Whitespace split
+    assert node.split(r"z", "nozsplit") == (["no", "split"],)  # Split by 'z'
+
+
+def test_regex_sub():
+    node = RegexSub()
+    assert node.sub(r"cat", "dog", "cat is here") == ("dog is here",)
+    assert node.sub(r"\d+", "NUMBER", "abc 123 def 456") == ("abc NUMBER def NUMBER",)
+    assert node.sub(r"\d+", "NUMBER", "abc 123 def 456", count=1) == ("abc NUMBER def 456",)  # Limit replacements
+    assert node.sub(r"[aeiou]", "*", "hello") == ("h*ll*",)
+
+
+def test_regex_test():
+    node = RegexTest()
+    assert node.test(r"abc", "a quick abc") == (True,)
+    assert node.test(r"def", "a quick abc") == (False,)
+    assert node.test(r"\d+", "contains 456") == (True,)
+    assert node.test(r"^\s*$", "") == (True,)  # Empty string matches whitespace pattern
diff --git a/tests/test_set_nodes.py b/tests/test_set_nodes.py
new file mode 100644
index 0000000..b80541f
--- /dev/null
+++ b/tests/test_set_nodes.py
@@ -0,0 +1,124 @@
+#import pytest
+from src.basic_data_handling.set_nodes import (
+    SetAdd,
+    SetRemove,
+    SetDiscard,
+    SetPop,
+    SetClear,
+    SetUnion,
+    SetIntersection,
+    SetDifference,
+    SetSymmetricDifference,
+    SetIsSubset,
+    SetIsSuperset,
+    SetIsDisjoint,
+    SetContains,
+    SetLength,
+    ListToSet,
+    SetToList
+)
+
+def test_set_add():
+    node = SetAdd()
+    assert node.add({1, 2}, 3) == ({1, 2, 3},)
+    assert node.add({1, 2}, 1) == ({1, 2},)  # Adding an existing item
+
+
+def test_set_remove():
+    node = SetRemove()
+    assert node.remove({1, 2, 3}, 2) == ({1, 3}, True)  # Successful removal
+    assert node.remove({1, 2, 3}, 4) == ({1, 2, 3}, False)  # Item not in set
+
+
+def test_set_discard():
+    node = SetDiscard()
+    assert node.discard({1, 2, 3}, 2) == ({1, 3},)  # Successful removal
+    assert node.discard({1, 2, 3}, 4) == ({1, 2, 3},)  # No error for missing item
+
+
+def test_set_pop():
+    node = SetPop()
+    input_set = {1, 2, 3}
+    result_set, removed_item = node.pop(input_set)
+    assert result_set != input_set  # Arbitrary item removed
+    assert removed_item in input_set  # Removed item was part of original set
+
+    empty_set = set()
+    assert node.pop(empty_set) == (set(), None)  # Handle empty set
+
+
+def test_set_clear():
+    node = SetClear()
+    assert node.clear({1, 2, 3}) == (set(),)
+    assert node.clear(set()) == (set(),)  # Already empty set remains empty
+
+
+def test_set_union():
+    node = SetUnion()
+    assert node.union({1, 2}, {3, 4}) == ({1, 2, 3, 4},)
+    assert node.union({1}, {2}, {3}, {4}) == ({1, 2, 3, 4},)
+    assert node.union({1, 2}, set()) == ({1, 2},)  # Union with empty set
+
+
+def test_set_intersection():
+    node = SetIntersection()
+    assert node.intersection({1, 2, 3}, {2, 3, 4}) == ({2, 3},)
+    assert node.intersection({1, 2, 3}, {4, 5}) == (set(),)  # No common elements
+    assert node.intersection({1, 2, 3}, {2, 3}, {3, 4}) == ({3},)  # Multiple sets
+
+
+def test_set_difference():
+    node = SetDifference()
+    assert node.difference({1, 2, 3}, {2, 3, 4}) == ({1},)
+    assert node.difference({1, 2, 3}, {4, 5}) == ({1, 2, 3},)  # Nothing to remove
+
+
+def test_set_symmetric_difference():
+    node = SetSymmetricDifference()
+    assert node.symmetric_difference({1, 2, 3}, {3, 4, 5}) == ({1, 2, 4, 5},)
+    assert node.symmetric_difference({1, 2, 3}, {1, 2, 3}) == (set(),)  # No unique elements
+
+
+def test_set_is_subset():
+    node = SetIsSubset()
+    assert node.is_subset({1, 2}, {1, 2, 3}) == (True,)
+    assert node.is_subset({1, 4}, {1, 2, 3}) == (False,)
+    assert node.is_subset(set(), {1, 2, 3}) == (True,)  # Empty set is subset of all sets
+
+
+def test_set_is_superset():
+    node = SetIsSuperset()
+    assert node.is_superset({1, 2, 3}, {1, 2}) == (True,)
+    assert node.is_superset({1, 2}, {1, 2, 3}) == (False,)
+    assert node.is_superset(set(), set()) == (True,)  # Empty set is a superset of itself
+
+
+def test_set_is_disjoint():
+    node = SetIsDisjoint()
+    assert node.is_disjoint({1, 2}, {3, 4}) == (True,)  # No common elements
+    assert node.is_disjoint({1, 2}, {2, 3}) == (False,)  # Common element
+
+
+def test_set_contains():
+    node = SetContains()
+    assert node.contains({1, 2, 3}, 2) == (True,)
+    assert node.contains({1, 2, 3}, 4) == (False,)
+
+
+def test_set_length():
+    node = SetLength()
+    assert node.length({1, 2, 3}) == (3,)
+    assert node.length(set()) == (0,)  # Empty set
+
+
+def test_list_to_set():
+    node = ListToSet()
+    assert node.convert([1, 2, 3, 2]) == ({1, 2, 3},)
+    assert node.convert([]) == (set(),)  # Empty list
+
+
+def test_set_to_list():
+    node = SetToList()
+    result = node.convert({1, 2, 3})
+    assert isinstance(result, tuple)
+    assert sorted(result[0]) == [1, 2, 3]  # Validate conversion to list