Separate creating createFileUrl and shortlink so it is unit testable

src/lib/links.test.ts

@@ -0,0 +1,17 @@
+import { ASK_TO_OPEN_QUERY_PARAM, CREATE_FILE_URL_PARAM } from './constants'
+import { createCreateFileUrl } from './links'
+
+describe(`link creation tests`, () => {
+  test(`createCreateFileUrl happy path`, async () => {
+    const code = `extrusionDistance = 12`
+    const name = `test`
+    const units = `mm`
+
+    // Converted with external online tools
+    const expectedEncodedCode = `ZXh0cnVzaW9uRGlzdGFuY2UgPSAxMg%3D%3D`
+    const expectedLink = `http:/localhost:3000/?${CREATE_FILE_URL_PARAM}&name=test&units=mm&code=${expectedEncodedCode}&${ASK_TO_OPEN_QUERY_PARAM}`
+
+    const result = createCreateFileUrl({ code, name, units })
+    expect(result.toString()).toBe(expectedLink)
+  })
+})