adding initial tests

poetry.lock

@@ -38,7 +38,7 @@ wrapt = ">=1.11,<1.14"
 name = "atomicwrites"
 version = "1.4.0"
 description = "Atomic file writes."
-category = "dev"
+category = "main"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 
@@ -46,7 +46,7 @@ python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 name = "attrs"
 version = "21.2.0"
 description = "Classes Without Boilerplate"
-category = "dev"
+category = "main"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 
@@ -181,7 +181,7 @@ typing-extensions = {version = ">=3.7.4.3", markers = "python_version < \"3.10\"
 name = "iniconfig"
 version = "1.1.1"
 description = "iniconfig: brain-dead simple config-ini parsing"
-category = "dev"
+category = "main"
 optional = false
 python-versions = "*"
 
@@ -277,7 +277,7 @@ python-versions = "*"
 name = "packaging"
 version = "21.0"
 description = "Core utilities for Python packages"
-category = "dev"
+category = "main"
 optional = false
 python-versions = ">=3.6"
 
@@ -367,7 +367,7 @@ test = ["appdirs (==1.4.4)", "pytest (>=6)", "pytest-cov (>=2.7)", "pytest-mock
 name = "pluggy"
 version = "1.0.0"
 description = "plugin and hook calling mechanisms for python"
-category = "dev"
+category = "main"
 optional = false
 python-versions = ">=3.6"
 
@@ -422,7 +422,7 @@ python-versions = "*"
 name = "py"
 version = "1.10.0"
 description = "library with cross-python path, ini-parsing, io, code, log facilities"
-category = "dev"
+category = "main"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 
@@ -555,7 +555,7 @@ pylint = ">=1.7"
 name = "pyparsing"
 version = "3.0.1"
 description = "Python parsing module"
-category = "dev"
+category = "main"
 optional = false
 python-versions = ">=3.6"
 
@@ -566,7 +566,7 @@ diagrams = ["jinja2", "railroad-diagrams"]
 name = "pytest"
 version = "6.2.5"
 description = "pytest: simple powerful testing with Python"
-category = "dev"
+category = "main"
 optional = false
 python-versions = ">=3.6"
 
@@ -583,6 +583,17 @@ toml = "*"
 [package.extras]
 testing = ["argcomplete", "hypothesis (>=3.56)", "mock", "nose", "requests", "xmlschema"]
 
+[[package]]
+name = "pytest-datadir"
+version = "1.3.1"
+description = "pytest plugin for test data directories and files"
+category = "main"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+
+[package.dependencies]
+pytest = ">=2.7.0"
+
 [[package]]
 name = "python-dateutil"
 version = "2.8.2"
@@ -702,7 +713,7 @@ python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,>=2.7"
 [metadata]
 lock-version = "1.1"
 python-versions = "^3.8"
-content-hash = "d34e6da39ccdc2c892d1e9c263384b3b0a3ea59aaf0efb57c0b7d52d23635b56"
+content-hash = "21a4ccbcf449e8ef748f7fffef2b07f245e58df5dc5c119591758f907c3c1b65"
 
 [metadata.files]
 altgraph = [
@@ -1026,6 +1037,10 @@ pytest = [
     {file = "pytest-6.2.5-py3-none-any.whl", hash = "sha256:7310f8d27bc79ced999e760ca304d69f6ba6c6649c0b60fb0e04a4a77cacc134"},
     {file = "pytest-6.2.5.tar.gz", hash = "sha256:131b36680866a76e6781d13f101efb86cf674ebb9762eb70d3082b6f29889e89"},
 ]
+pytest-datadir = [
+    {file = "pytest-datadir-1.3.1.tar.gz", hash = "sha256:d3af1e738df87515ee509d6135780f25a15959766d9c2b2dbe02bf4fb979cb18"},
+    {file = "pytest_datadir-1.3.1-py2.py3-none-any.whl", hash = "sha256:1847ed0efe0bc54cac40ab3fba6d651c2f03d18dd01f2a582979604d32e7621e"},
+]
 python-dateutil = [
     {file = "python-dateutil-2.8.2.tar.gz", hash = "sha256:0123cacc1627ae19ddf3c27a5de5bd67ee4586fbdd6440d9748f8abb483d3e86"},
     {file = "python_dateutil-2.8.2-py2.py3-none-any.whl", hash = "sha256:961d03dc3453ebbc59dbdea9e4e11c5651520a876d0f4db161e8674aae935da9"},