adds 'popper scaffold' test (#807)

cli/test/test_scaffold.py

@@ -0,0 +1,49 @@
+from click.testing import CliRunner
+
+import popper.commands.cmd_scaffold as scaffold
+import popper.commands.cmd_run as run
+from test_common import PopperTest
+from popper.parser import Workflow, YMLWorkflow, HCLWorkflow
+
+import unittest
+import os
+import tempfile
+
+
+class TestScaffold(PopperTest):
+
+    def test_scaffold(self):
+
+        wf_dir = tempfile.mkdtemp()
+        runner = CliRunner()
+        file_loc = f'{wf_dir}/wf.yml'
+
+        result = runner.invoke(scaffold.cli, ['-f', file_loc])
+
+        self.assertEqual(result.exit_code, 0)
+        self.assertTrue(os.path.isfile(file_loc))
+
+        wf = Workflow.new(file_loc)
+        self.assertDictEqual(wf.steps, {
+            '1': {
+                'uses': 'popperized/bin/sh@master',
+                'args': ['ls'],
+                        'name': '1',
+                        'next': {'2'}},
+            '2': {
+                'uses': 'docker://alpine:3.11',
+                'args': ['ls'],
+                'name': '2',
+                        'needs': ['1']}})
+
+        with self.assertLogs('popper') as test_logger:
+
+            result = runner.invoke(run.cli, ['-f', file_loc])
+            self.assertEqual(result.exit_code, 0)
+            self.assertTrue(len(test_logger.output))
+            self.assertTrue(
+                "INFO:popper:Step '1' ran successfully !"
+                in test_logger.output)
+            self.assertTrue(
+                "INFO:popper:Step '2' ran successfully !"
+                in test_logger.output)