Support multi-line script.

__tests__/script-parser.test.ts

@@ -0,0 +1,33 @@
+import * as parser from '../src/script-parser';
+
+describe('script parser tests', () => {
+  it('Scripts are trimmed', () => {
+    const script = ` command \n`;
+    expect(parser.parseScript(script)).toEqual(['command']);
+  });
+
+  it('Commented lines are filtered out', () => {
+    const script = `
+      # command1
+      command2 
+
+      # command3
+      command4
+      `;
+    expect(parser.parseScript(script)).toEqual(['command2', 'command4']);
+  });
+
+  it('Throws if parsed scripts array is empty', () => {
+    const func = () => {
+      const script = `
+        # command1
+
+        # command2
+
+      `;
+      const result = parser.parseScript(script);
+      console.log(`Result: ${result}`);
+    };
+    expect(func).toThrowError(`No valid script found.`);
+  });
+});