diff --git a/.gitignore b/.gitignore
index f0b1c72..fdbd054 100644
--- a/.gitignore
+++ b/.gitignore
@@ -28,3 +28,4 @@ src/xmltodict
 
 examples/data
 tests/tmp
+.env
diff --git a/poetry.lock b/poetry.lock
index b021e2f..1c4accf 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -1,9 +1,10 @@
-# This file is automatically @generated by Poetry 1.7.1 and should not be changed by hand.
+# This file is automatically @generated by Poetry and should not be changed by hand.
 
 [[package]]
 name = "alabaster"
 version = "0.7.16"
 description = "A light, configurable Sphinx theme"
+category = "main"
 optional = false
 python-versions = ">=3.9"
 files = [
@@ -15,6 +16,7 @@ files = [
 name = "babel"
 version = "2.15.0"
 description = "Internationalization utilities"
+category = "main"
 optional = false
 python-versions = ">=3.8"
 files = [
@@ -29,6 +31,7 @@ dev = ["freezegun (>=1.0,<2.0)", "pytest (>=6.0)", "pytest-cov"]
 name = "beautifulsoup4"
 version = "4.12.3"
 description = "Screen-scraping library"
+category = "main"
 optional = false
 python-versions = ">=3.6.0"
 files = [
@@ -50,6 +53,7 @@ lxml = ["lxml"]
 name = "black"
 version = "24.4.2"
 description = "The uncompromising code formatter."
+category = "dev"
 optional = false
 python-versions = ">=3.8"
 files = [
@@ -96,6 +100,7 @@ uvloop = ["uvloop (>=0.15.2)"]
 name = "certifi"
 version = "2024.6.2"
 description = "Python package for providing Mozilla's CA Bundle."
+category = "main"
 optional = false
 python-versions = ">=3.6"
 files = [
@@ -107,6 +112,7 @@ files = [
 name = "charset-normalizer"
 version = "3.3.2"
 description = "The Real First Universal Charset Detector. Open, modern and actively maintained alternative to Chardet."
+category = "main"
 optional = false
 python-versions = ">=3.7.0"
 files = [
@@ -206,6 +212,7 @@ files = [
 name = "click"
 version = "8.1.7"
 description = "Composable command line interface toolkit"
+category = "dev"
 optional = false
 python-versions = ">=3.7"
 files = [
@@ -220,6 +227,7 @@ colorama = {version = "*", markers = "platform_system == \"Windows\""}
 name = "colorama"
 version = "0.4.6"
 description = "Cross-platform colored terminal text."
+category = "main"
 optional = false
 python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,!=3.5.*,!=3.6.*,>=2.7"
 files = [
@@ -231,6 +239,7 @@ files = [
 name = "commonmark"
 version = "0.9.1"
 description = "Python parser for the CommonMark Markdown spec"
+category = "main"
 optional = false
 python-versions = "*"
 files = [
@@ -245,6 +254,7 @@ test = ["flake8 (==3.7.8)", "hypothesis (==3.55.3)"]
 name = "coverage"
 version = "7.5.3"
 description = "Code coverage measurement for Python"
+category = "dev"
 optional = false
 python-versions = ">=3.8"
 files = [
@@ -312,6 +322,7 @@ toml = ["tomli"]
 name = "docutils"
 version = "0.21.2"
 description = "Docutils -- Python Documentation Utilities"
+category = "main"
 optional = false
 python-versions = ">=3.9"
 files = [
@@ -323,6 +334,7 @@ files = [
 name = "exceptiongroup"
 version = "1.2.1"
 description = "Backport of PEP 654 (exception groups)"
+category = "dev"
 optional = false
 python-versions = ">=3.7"
 files = [
@@ -337,6 +349,7 @@ test = ["pytest (>=6)"]
 name = "flake8"
 version = "7.0.0"
 description = "the modular source code checker: pep8 pyflakes and co"
+category = "dev"
 optional = false
 python-versions = ">=3.8.1"
 files = [
@@ -353,6 +366,7 @@ pyflakes = ">=3.2.0,<3.3.0"
 name = "furo"
 version = "2024.5.6"
 description = "A clean customisable Sphinx documentation theme."
+category = "main"
 optional = false
 python-versions = ">=3.8"
 files = [
@@ -370,6 +384,7 @@ sphinx-basic-ng = ">=1.0.0.beta2"
 name = "idna"
 version = "3.7"
 description = "Internationalized Domain Names in Applications (IDNA)"
+category = "main"
 optional = false
 python-versions = ">=3.5"
 files = [
@@ -381,6 +396,7 @@ files = [
 name = "imagesize"
 version = "1.4.1"
 description = "Getting image size from png/jpeg/jpeg2000/gif file"
+category = "main"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 files = [
@@ -392,6 +408,7 @@ files = [
 name = "importlib-metadata"
 version = "7.1.0"
 description = "Read metadata from Python packages"
+category = "main"
 optional = false
 python-versions = ">=3.8"
 files = [
@@ -411,6 +428,7 @@ testing = ["flufl.flake8", "importlib-resources (>=1.3)", "jaraco.test (>=5.4)",
 name = "iniconfig"
 version = "2.0.0"
 description = "brain-dead simple config-ini parsing"
+category = "dev"
 optional = false
 python-versions = ">=3.7"
 files = [
@@ -422,6 +440,7 @@ files = [
 name = "isort"
 version = "5.13.2"
 description = "A Python utility / library to sort Python imports."
+category = "dev"
 optional = false
 python-versions = ">=3.8.0"
 files = [
@@ -436,6 +455,7 @@ colors = ["colorama (>=0.4.6)"]
 name = "jinja2"
 version = "3.1.4"
 description = "A very fast and expressive template engine."
+category = "main"
 optional = false
 python-versions = ">=3.7"
 files = [
@@ -453,6 +473,7 @@ i18n = ["Babel (>=2.7)"]
 name = "markupsafe"
 version = "2.1.5"
 description = "Safely add untrusted strings to HTML/XML markup."
+category = "main"
 optional = false
 python-versions = ">=3.7"
 files = [
@@ -522,6 +543,7 @@ files = [
 name = "mccabe"
 version = "0.7.0"
 description = "McCabe checker, plugin for flake8"
+category = "dev"
 optional = false
 python-versions = ">=3.6"
 files = [
@@ -533,6 +555,7 @@ files = [
 name = "mypy-extensions"
 version = "1.0.0"
 description = "Type system extensions for programs checked with the mypy type checker."
+category = "dev"
 optional = false
 python-versions = ">=3.5"
 files = [
@@ -544,6 +567,7 @@ files = [
 name = "numpy"
 version = "1.26.4"
 description = "Fundamental package for array computing in Python"
+category = "main"
 optional = false
 python-versions = ">=3.9"
 files = [
@@ -589,6 +613,7 @@ files = [
 name = "packaging"
 version = "24.0"
 description = "Core utilities for Python packages"
+category = "main"
 optional = false
 python-versions = ">=3.7"
 files = [
@@ -600,6 +625,7 @@ files = [
 name = "pandas"
 version = "2.2.2"
 description = "Powerful data structures for data analysis, time series, and statistics"
+category = "main"
 optional = false
 python-versions = ">=3.9"
 files = [
@@ -673,6 +699,7 @@ xml = ["lxml (>=4.9.2)"]
 name = "pathspec"
 version = "0.12.1"
 description = "Utility library for gitignore style pattern matching of file paths."
+category = "dev"
 optional = false
 python-versions = ">=3.8"
 files = [
@@ -684,6 +711,7 @@ files = [
 name = "platformdirs"
 version = "4.2.2"
 description = "A small Python package for determining appropriate platform-specific dirs, e.g. a `user data dir`."
+category = "dev"
 optional = false
 python-versions = ">=3.8"
 files = [
@@ -700,6 +728,7 @@ type = ["mypy (>=1.8)"]
 name = "pluggy"
 version = "1.5.0"
 description = "plugin and hook calling mechanisms for python"
+category = "dev"
 optional = false
 python-versions = ">=3.8"
 files = [
@@ -715,6 +744,7 @@ testing = ["pytest", "pytest-benchmark"]
 name = "pycodestyle"
 version = "2.11.1"
 description = "Python style guide checker"
+category = "dev"
 optional = false
 python-versions = ">=3.8"
 files = [
@@ -726,6 +756,7 @@ files = [
 name = "pyflakes"
 version = "3.2.0"
 description = "passive checker of Python programs"
+category = "dev"
 optional = false
 python-versions = ">=3.8"
 files = [
@@ -737,6 +768,7 @@ files = [
 name = "pygments"
 version = "2.18.0"
 description = "Pygments is a syntax highlighting package written in Python."
+category = "main"
 optional = false
 python-versions = ">=3.8"
 files = [
@@ -751,6 +783,7 @@ windows-terminal = ["colorama (>=0.4.6)"]
 name = "pyrdfj2"
 version = "0.0.5"
 description = "Python wrapper on jinja SPARQL templating"
+category = "main"
 optional = false
 python-versions = ">=3.8.1,<4.0"
 files = []
@@ -772,6 +805,7 @@ resolved_reference = "b131b5a8b070820a1498135760e2ea427990b695"
 name = "pytest"
 version = "8.2.1"
 description = "pytest: simple powerful testing with Python"
+category = "dev"
 optional = false
 python-versions = ">=3.8"
 files = [
@@ -794,6 +828,7 @@ dev = ["argcomplete", "attrs (>=19.2)", "hypothesis (>=3.56)", "mock", "pygments
 name = "pytest-cov"
 version = "5.0.0"
 description = "Pytest plugin for measuring coverage."
+category = "dev"
 optional = false
 python-versions = ">=3.8"
 files = [
@@ -812,6 +847,7 @@ testing = ["fields", "hunter", "process-tests", "pytest-xdist", "virtualenv"]
 name = "python-dateutil"
 version = "2.9.0.post0"
 description = "Extensions to the standard Python datetime module"
+category = "main"
 optional = false
 python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,>=2.7"
 files = [
@@ -826,6 +862,7 @@ six = ">=1.5"
 name = "python-dotenv"
 version = "1.0.1"
 description = "Read key-value pairs from a .env file and set them as environment variables"
+category = "dev"
 optional = false
 python-versions = ">=3.8"
 files = [
@@ -840,6 +877,7 @@ cli = ["click (>=5.0)"]
 name = "pytz"
 version = "2024.1"
 description = "World timezone definitions, modern and historical"
+category = "main"
 optional = false
 python-versions = "*"
 files = [
@@ -851,6 +889,7 @@ files = [
 name = "pyyaml"
 version = "6.0.1"
 description = "YAML parser and emitter for Python"
+category = "dev"
 optional = false
 python-versions = ">=3.6"
 files = [
@@ -872,6 +911,7 @@ files = [
     {file = "PyYAML-6.0.1-cp311-cp311-win_amd64.whl", hash = "sha256:bf07ee2fef7014951eeb99f56f39c9bb4af143d8aa3c21b1677805985307da34"},
     {file = "PyYAML-6.0.1-cp312-cp312-macosx_10_9_x86_64.whl", hash = "sha256:855fb52b0dc35af121542a76b9a84f8d1cd886ea97c84703eaa6d88e37a2ad28"},
     {file = "PyYAML-6.0.1-cp312-cp312-macosx_11_0_arm64.whl", hash = "sha256:40df9b996c2b73138957fe23a16a4f0ba614f4c0efce1e9406a184b6d07fa3a9"},
+    {file = "PyYAML-6.0.1-cp312-cp312-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:a08c6f0fe150303c1c6b71ebcd7213c2858041a7e01975da3a99aed1e7a378ef"},
     {file = "PyYAML-6.0.1-cp312-cp312-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:6c22bec3fbe2524cde73d7ada88f6566758a8f7227bfbf93a408a9d86bcc12a0"},
     {file = "PyYAML-6.0.1-cp312-cp312-musllinux_1_1_x86_64.whl", hash = "sha256:8d4e9c88387b0f5c7d5f281e55304de64cf7f9c0021a3525bd3b1c542da3b0e4"},
     {file = "PyYAML-6.0.1-cp312-cp312-win32.whl", hash = "sha256:d483d2cdf104e7c9fa60c544d92981f12ad66a457afae824d146093b8c294c54"},
@@ -910,6 +950,7 @@ files = [
 name = "recommonmark"
 version = "0.7.1"
 description = "A docutils-compatibility bridge to CommonMark, enabling you to write CommonMark inside of Docutils & Sphinx projects."
+category = "main"
 optional = false
 python-versions = "*"
 files = [
@@ -926,6 +967,7 @@ sphinx = ">=1.3.1"
 name = "requests"
 version = "2.32.3"
 description = "Python HTTP for Humans."
+category = "main"
 optional = false
 python-versions = ">=3.8"
 files = [
@@ -947,6 +989,7 @@ use-chardet-on-py3 = ["chardet (>=3.0.2,<6)"]
 name = "six"
 version = "1.16.0"
 description = "Python 2 and 3 compatibility utilities"
+category = "main"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*"
 files = [
@@ -958,6 +1001,7 @@ files = [
 name = "snowballstemmer"
 version = "2.2.0"
 description = "This package provides 29 stemmers for 28 languages generated from Snowball algorithms."
+category = "main"
 optional = false
 python-versions = "*"
 files = [
@@ -969,6 +1013,7 @@ files = [
 name = "soupsieve"
 version = "2.5"
 description = "A modern CSS selector implementation for Beautiful Soup."
+category = "main"
 optional = false
 python-versions = ">=3.8"
 files = [
@@ -980,6 +1025,7 @@ files = [
 name = "sphinx"
 version = "7.3.7"
 description = "Python documentation generator"
+category = "main"
 optional = false
 python-versions = ">=3.9"
 files = [
@@ -1016,6 +1062,7 @@ test = ["cython (>=3.0)", "defusedxml (>=0.7.1)", "pytest (>=6.0)", "setuptools
 name = "sphinx-basic-ng"
 version = "1.0.0b2"
 description = "A modern skeleton for Sphinx themes."
+category = "main"
 optional = false
 python-versions = ">=3.7"
 files = [
@@ -1033,6 +1080,7 @@ docs = ["furo", "ipython", "myst-parser", "sphinx-copybutton", "sphinx-inline-ta
 name = "sphinxcontrib-applehelp"
 version = "1.0.8"
 description = "sphinxcontrib-applehelp is a Sphinx extension which outputs Apple help books"
+category = "main"
 optional = false
 python-versions = ">=3.9"
 files = [
@@ -1049,6 +1097,7 @@ test = ["pytest"]
 name = "sphinxcontrib-devhelp"
 version = "1.0.6"
 description = "sphinxcontrib-devhelp is a sphinx extension which outputs Devhelp documents"
+category = "main"
 optional = false
 python-versions = ">=3.9"
 files = [
@@ -1065,6 +1114,7 @@ test = ["pytest"]
 name = "sphinxcontrib-htmlhelp"
 version = "2.0.5"
 description = "sphinxcontrib-htmlhelp is a sphinx extension which renders HTML help files"
+category = "main"
 optional = false
 python-versions = ">=3.9"
 files = [
@@ -1081,6 +1131,7 @@ test = ["html5lib", "pytest"]
 name = "sphinxcontrib-jsmath"
 version = "1.0.1"
 description = "A sphinx extension which renders display math in HTML via JavaScript"
+category = "main"
 optional = false
 python-versions = ">=3.5"
 files = [
@@ -1095,6 +1146,7 @@ test = ["flake8", "mypy", "pytest"]
 name = "sphinxcontrib-qthelp"
 version = "1.0.7"
 description = "sphinxcontrib-qthelp is a sphinx extension which outputs QtHelp documents"
+category = "main"
 optional = false
 python-versions = ">=3.9"
 files = [
@@ -1111,6 +1163,7 @@ test = ["pytest"]
 name = "sphinxcontrib-serializinghtml"
 version = "1.1.10"
 description = "sphinxcontrib-serializinghtml is a sphinx extension which outputs \"serialized\" HTML files (json and pickle)"
+category = "main"
 optional = false
 python-versions = ">=3.9"
 files = [
@@ -1127,6 +1180,7 @@ test = ["pytest"]
 name = "tomli"
 version = "2.0.1"
 description = "A lil' TOML parser"
+category = "main"
 optional = false
 python-versions = ">=3.7"
 files = [
@@ -1138,6 +1192,7 @@ files = [
 name = "typeguard"
 version = "4.3.0"
 description = "Run-time type checker for Python"
+category = "main"
 optional = false
 python-versions = ">=3.8"
 files = [
@@ -1157,6 +1212,7 @@ test = ["coverage[toml] (>=7)", "mypy (>=1.2.0)", "pytest (>=7)"]
 name = "typing-extensions"
 version = "4.12.1"
 description = "Backported and Experimental Type Hints for Python 3.8+"
+category = "main"
 optional = false
 python-versions = ">=3.8"
 files = [
@@ -1168,6 +1224,7 @@ files = [
 name = "tzdata"
 version = "2024.1"
 description = "Provider of IANA time zone data"
+category = "main"
 optional = false
 python-versions = ">=2"
 files = [
@@ -1179,6 +1236,7 @@ files = [
 name = "uritemplate"
 version = "4.1.1"
 description = "Implementation of RFC 6570 URI Templates"
+category = "main"
 optional = false
 python-versions = ">=3.6"
 files = [
@@ -1190,6 +1248,7 @@ files = [
 name = "urllib3"
 version = "2.2.1"
 description = "HTTP library with thread-safe connection pooling, file post, and more."
+category = "main"
 optional = false
 python-versions = ">=3.8"
 files = [
@@ -1207,6 +1266,7 @@ zstd = ["zstandard (>=0.18.0)"]
 name = "validators"
 version = "0.28.3"
 description = "Python Data Validation for Humans™"
+category = "main"
 optional = false
 python-versions = ">=3.8"
 files = [
@@ -1218,6 +1278,7 @@ files = [
 name = "xmlasdict"
 version = "0.2.2"
 description = "python library to read xml DOM trees as dicts (with iter and gettattribute behaviour)"
+category = "main"
 optional = false
 python-versions = "*"
 files = [
@@ -1229,6 +1290,7 @@ files = [
 name = "zipp"
 version = "3.19.1"
 description = "Backport of pathlib-compatible object wrapper for zip files"
+category = "main"
 optional = false
 python-versions = ">=3.8"
 files = [
diff --git a/tests/test_conditional.py b/tests/test_conditional.py
index 0d84efd..38eb66f 100644
--- a/tests/test_conditional.py
+++ b/tests/test_conditional.py
@@ -3,7 +3,7 @@
 import unittest
 from pathlib import Path
 
-import pandas as pd
+from util4tests import log, run_single_test
 
 from pysubyt import Subyt
 
@@ -20,6 +20,8 @@ def test_conditional(self):
         if Path("./tests/tmp/data/D.ttl").exists():
             os.remove("./tests/tmp/data/D.ttl")
 
+        data_mtime0 = os.stat("./tests/resources/data.csv").st_mtime
+
         # first run
         Subyt(
             source="./tests/resources/data.csv",
@@ -29,6 +31,7 @@ def test_conditional(self):
             conditional=True,
         ).process()
         A_mtime1 = os.stat("./tests/tmp/data/A.ttl").st_mtime
+        log.debug(f"A.ttl exists and lastmod at {A_mtime1}")
 
         # second run and no updates to input file
         time.sleep(1)
@@ -40,13 +43,17 @@ def test_conditional(self):
             conditional=True,
         ).process()
         A_mtime2 = os.stat("./tests/tmp/data/A.ttl").st_mtime
-        assert A_mtime1 == A_mtime2  # output file should not have been updated
+        assert A_mtime1 == A_mtime2, "A.ttl output should not been updated"
+        log.debug(f"A.ttl lastmod still at {A_mtime2}")
 
         # third run and update to input file
+        Path("./tests/resources/data.csv").touch()
+        data_mtime3 = os.stat("./tests/resources/data.csv").st_mtime
+        log.debug(f"data.csv updated at {data_mtime3}")
+        assert data_mtime0 < data_mtime3, "data file not updated"
+        assert A_mtime1 < data_mtime3, "data still older then last output"
         time.sleep(1)
-        df = pd.read_csv("./tests/resources/data.csv")
-        df.at[0, "value"] = 0
-        df.to_csv("./tests/resources/data.csv", index=False)
+
         Subyt(
             source="./tests/resources/data.csv",
             sink="./tests/tmp/data/{key}.ttl",
@@ -55,7 +62,11 @@ def test_conditional(self):
             conditional=True,
         ).process()
         A_mtime3 = os.stat("./tests/tmp/data/A.ttl").st_mtime
-        assert A_mtime1 < A_mtime3  # output file should have been updated
+        assert A_mtime1 < A_mtime3, "A.ttl output should been updated"
+        assert data_mtime3 < A_mtime3, (
+            "A.ttl output file should be newer then data input"
+            f"{data_mtime3} < {A_mtime3}"
+        )
 
         # fourth run and no updates to input file
         time.sleep(1)
@@ -68,7 +79,7 @@ def test_conditional(self):
         ).process()
         A_mtime4 = os.stat("./tests/tmp/data/A.ttl").st_mtime
         D_mtime4 = os.stat("./tests/tmp/data/D.ttl").st_mtime
-        assert A_mtime3 == A_mtime4  # output file should not have been updated
+        assert A_mtime3 == A_mtime4, "A.ttl output should not been updated"
 
         # fifth run and one of the output files is missing
         time.sleep(1)
@@ -82,10 +93,9 @@ def test_conditional(self):
         ).process()
         A_mtime5 = os.stat("./tests/tmp/data/A.ttl").st_mtime
         D_mtime5 = os.stat("./tests/tmp/data/D.ttl").st_mtime
-        assert A_mtime4 == A_mtime5  # output file should not have been updated
-        assert D_mtime4 < D_mtime5  # output file should have been updated
+        assert A_mtime4 == A_mtime5, "A.ttl output should not been updated"
+        assert D_mtime4 < D_mtime5, "D.ttl output should been updated"
+
 
-        # reset input file
-        df = pd.read_csv("./tests/resources/data.csv")
-        df.at[0, "value"] = 1
-        df.to_csv("./tests/resources/data.csv", index=False)
+if __name__ == "__main__":
+    run_single_test(__file__)