adding tests for CLI functionality (#1718)

* test: add a basic cli test for savesequence

* refactor cli-test

* Run cli tests seperately

Co-authored-by: Jeffrey Warren <jeff@unterbahn.com>
Co-authored-by: Harsh Khandeparkar <34770591+HarshKhandeparkar@users.noreply.github.com>

test/cli/saveSequence.js

@@ -0,0 +1,38 @@
+require('../../src/ImageSequencer');
+sequencer = ImageSequencer({ ui: true });
+const saveSequence = require('../../src/cli/saveSequence.js');
+const test = require('tape');
+const { Command } = require('commander');
+
+
+test('testing save sequence function', function (t) {
+  try {
+    let program = new Command();
+    program
+      .option('--save-sequence [string]', 'Name space separated with Stringified sequence');
+
+    program.parse(['node', 'test', '--save-sequence', '"invert brightness"']);
+
+    if (program.saveSequence)
+      saveSequence(program, sequencer);
+    t.true(1, 'creation success');
+
+  } catch (error) {
+    t.true(!error, 'creation fail');
+  }
+  try {
+    let program = new Command();
+    program
+      .option('--save-sequence [string]', 'Name space separated with Stringified sequence');
+
+    program.parse(['node', 'test', '--save-sequence']);
+
+    if (program.saveSequence)
+      saveSequence(program, sequencer);
+    t.true(0, 'creation success');
+
+  } catch (error) {
+    t.true(1, 'creation fail');
+  }
+  t.end();
+});