diff --git a/dtran/main.py b/dtran/main.py
index 1fd0a54..44a3511 100644
--- a/dtran/main.py
+++ b/dtran/main.py
@@ -12,9 +12,13 @@ def cli():
     ignore_unknown_options=True,
     allow_extra_args=True,
 ))
-@click.option("--config", help="full path to config")
+@click.option("--config", help="Full path to the config.")
+@click.option(
+    "--dryrun", is_flag=True,
+    help="Only check parsed inputs without actual execution."
+)
 @click.pass_context
-def create_pipeline(ctx, config=None):
+def create_pipeline(ctx, config=None, dryrun=False):
     """
     Creates a pipeline and execute it based on given config and input(optional).
     To specify the input to pipeline, use (listed in ascending priority):
@@ -36,6 +40,10 @@ def create_pipeline(ctx, config=None):
     parser = ConfigParser(user_inputs)
     parsed_pipeline, parsed_inputs = parser.parse(config)
 
+    if dryrun:
+        print(parsed_inputs)
+        return
+
     # Execute the pipeline
     parsed_pipeline.exec(parsed_inputs)
 
diff --git a/test/README.md b/test/README.md
new file mode 100644
index 0000000..e5e6a48
--- /dev/null
+++ b/test/README.md
@@ -0,0 +1,6 @@
+## Prereq
+Install Pytest in the current container/env
+
+## Run
+Run the following scripts in /ws:
+`python -m pytest test/cli_unit_test.py`
\ No newline at end of file
diff --git a/test/cli_unit_test.py b/test/cli_unit_test.py
new file mode 100644
index 0000000..ee7e488
--- /dev/null
+++ b/test/cli_unit_test.py
@@ -0,0 +1,103 @@
+import pytest
+from click.testing import CliRunner
+from unittest.mock import patch, call, MagicMock
+
+from dtran.main import cli
+
+
+# https://click.palletsprojects.com/en/7.x/testing/
+@pytest.mark.parametrize(
+    "func_name, attr_name, arg_value",
+    [
+        ("", "", ""),
+        ("substitute", "attr", "some value"),
+    ]
+)
+@patch('dtran.main.ConfigParser', autospec=True)
+def test_cli_valid(parser_mock, func_name, attr_name, arg_value):
+    """
+    This function tests 3 valid scenarios:
+    1) User does not specify any inputs
+    2) User updates existing inputs
+    3) User inserts new valid inputs
+    """
+    pipeline_mock = MagicMock()
+    mock_parsed_inputs = {
+        "keep_attr": "keep this value",
+        "substitute_attr": "substitute this value"
+    }
+
+    parser_mock.return_value.parse.return_value = (
+        pipeline_mock,
+        mock_parsed_inputs
+    )
+
+    mock_user_inputs = {}
+
+    runner = CliRunner()
+    if not func_name or not attr_name:
+        result = runner.invoke(cli, [
+            'create_pipeline', '--config', 'config/path'
+        ])
+    else:
+        mock_user_inputs = {
+            (func_name, attr_name): arg_value
+        }
+        result = runner.invoke(cli, [
+            'create_pipeline', '--config', 'config/path',
+            f'--{func_name}.{attr_name}={arg_value}',
+        ])
+
+    assert result.exit_code == 0
+    assert parser_mock.mock_calls == [call(mock_user_inputs), call().parse('config/path')]
+    assert pipeline_mock.exec.mock_calls[-1] == call(mock_parsed_inputs)
+
+
+@pytest.mark.parametrize(
+    "func_name, attr_name, arg_value",
+    [
+        ("substitute", "attr", "some value"),
+    ]
+)
+def test_cli_invalid(func_name, attr_name, arg_value):
+    """
+    This function tests invalid cli input scenario.
+    """
+    runner = CliRunner()
+    arg = f'--{func_name}//{attr_name}={arg_value}'
+    result = runner.invoke(cli, [
+        'create_pipeline', '--config', 'config/path', arg
+    ])
+
+    assert result.exit_code == 0
+    assert f"user input: '{arg}' should have format '--FuncName.Attr=value'" in result.output
+
+
+@pytest.mark.parametrize(
+    "func_name, attr_name, arg_value",
+    [
+        ("substitute", "attr", "some value"),
+    ]
+)
+@patch('dtran.main.ConfigParser', autospec=True)
+def test_cli_dryrun(parser_mock, func_name, attr_name, arg_value):
+    pipeline_mock = MagicMock()
+    mock_parsed_inputs = {
+        "keep_attr": "keep this value",
+        "substitute_attr": "substitute this value"
+    }
+
+    parser_mock.return_value.parse.return_value = (
+        pipeline_mock,
+        mock_parsed_inputs
+    )
+
+    runner = CliRunner()
+    result = runner.invoke(cli, [
+        'create_pipeline', '--config', 'config/path',
+        f'--{func_name}.{attr_name}={arg_value}', '--dryrun'
+    ])
+
+    for parsed_key, parsed_value in mock_parsed_inputs.items():
+        assert parsed_key in result.output
+        assert parsed_value in result.output
diff --git a/test/parser_unit_test.py b/test/parser_unit_test.py
new file mode 100644
index 0000000..b5206a2
--- /dev/null
+++ b/test/parser_unit_test.py
@@ -0,0 +1,37 @@
+import pytest
+from dtran.config_parser import ConfigParser
+from unittest.mock import patch, call, MagicMock
+from funcs import ReadFunc, UnitTransFunc, GraphWriteFunc
+
+
+@pytest.mark.parametrize("config_path", [
+    "test/sample_config.json", "test/sample_config.yml"
+])
+@patch('dtran.config_parser.Pipeline')
+def test_config_parser_no_user_inputs(pipeline_mock, config_path):
+    pipeline_mock.return_value = MagicMock()
+
+    parser = ConfigParser({})
+    parsed_pipeline, parsed_inputs = parser.parse(config_path)
+    assert "$/liter" in parsed_inputs.values()
+    assert pipeline_mock.mock_calls[-1] == call(
+        [ReadFunc, UnitTransFunc, GraphWriteFunc],
+        [(['unit_trans', 1, 'graph'], ['read_func', 1, 'data']), (['graph_write_func', 1, 'graph'], ['unit_trans', 1, 'graph'])]
+    )
+
+
+@pytest.mark.parametrize("config_path", [
+    "test/sample_config.json", "test/sample_config.yml"
+])
+@patch('dtran.config_parser.Pipeline')
+def test_config_parser_with_user_inputs(pipeline_mock, config_path):
+    pipeline_mock.return_value = MagicMock()
+
+    parser = ConfigParser({("MyCustomName2", "unit_desired"): "$/oz"})
+    parsed_pipeline, parsed_inputs = parser.parse(config_path)
+    assert "$/oz" in parsed_inputs.values()
+    assert pipeline_mock.mock_calls[-1] == call(
+        [ReadFunc, UnitTransFunc, GraphWriteFunc],
+        [(['unit_trans', 1, 'graph'], ['read_func', 1, 'data']),
+         (['graph_write_func', 1, 'graph'], ['unit_trans', 1, 'graph'])]
+    )
diff --git a/test/sample_config.json b/test/sample_config.json
new file mode 100644
index 0000000..0165142
--- /dev/null
+++ b/test/sample_config.json
@@ -0,0 +1,33 @@
+{
+  "version": "1",
+  "adapters": {
+    "MyCustomName1": {
+      "comment": "My First Adapter",
+      "adapter": "funcs.ReadFunc",
+      "inputs": {
+        "repr_file": "./examples/demo/s01_ethiopia_commodity_price.yml",
+        "resources": "./examples/demo/s01_ethiopia_commodity_price.csv"
+      }
+    },
+    "MyCustomName2": {
+      "comment": "My Second Adapter",
+      "adapter": "funcs.UnitTransFunc",
+      "inputs": {
+        "graph": "$.MyCustomName1.data",
+        "unit_value": "rdf:value",
+        "unit_label": "eg:unit",
+        "unit_desired": "$/liter"
+      }
+    },
+    "MyCustomName3": {
+      "comment": "My Third Adapter",
+      "adapter": "funcs.GraphWriteFunc",
+      "inputs": {
+        "graph": "$.MyCustomName2.graph",
+        "main_class": "qb:Observation",
+        "output_file": "./examples/demo/s01_ethiopia_commodity_price_write.csv",
+        "mapped_columns": {}
+      }
+    }
+  }
+}
\ No newline at end of file
diff --git a/test/sample_config.yml b/test/sample_config.yml
new file mode 100644
index 0000000..7ddcfb2
--- /dev/null
+++ b/test/sample_config.yml
@@ -0,0 +1,24 @@
+version: "1"
+adapters:
+  MyCustomName1:
+    comment: My First Adapter
+    adapter: funcs.ReadFunc
+    inputs:
+      repr_file: ./examples/demo/s01_ethiopia_commodity_price.yml
+      resources: ./examples/demo/s01_ethiopia_commodity_price.csv
+  MyCustomName2:
+    comment: My Second Adapter
+    adapter: funcs.UnitTransFunc
+    inputs:
+      graph: $.MyCustomName1.data
+      unit_value: rdf:value
+      unit_label: eg:unit
+      unit_desired: $/liter
+  MyCustomName3:
+    comment: My Third Adapter
+    adapter: funcs.GraphWriteFunc
+    inputs:
+      graph: $.MyCustomName2.graph
+      main_class: qb:Observation
+      output_file: ./examples/demo/s01_ethiopia_commodity_price_write.csv
+      mapped_columns: {}
\ No newline at end of file