add test for issue option (#20)

src/issue.ts

@@ -0,0 +1,17 @@
+import * as core from '@actions/core'
+import {IssueOption} from './interface'
+
+export function getIssueOption(body: string): IssueOption {
+  return {
+    title: core.getInput('issue_title'),
+    body,
+    assignees: core
+      .getInput('issue_assignees')
+      .replace(/\s+/g, '')
+      .split(','),
+    labels: core
+      .getInput('issue_labels')
+      .replace(/\s+/g, '')
+      .split(',')
+  }
+}