add first passing test

tests/helpers/memberRoles.test.ts

@@ -0,0 +1,28 @@
+import { Collection, GuildMember, Role } from "discord.js"
+import { filterRolesFromMemberUpdate } from "../../server/helper/roleFilter"
+
+function buildFakeRole(id: string, name: string): Role {
+  return <Role>{ id, name }
+
+}
+test('filterRolesFromMemberUpdate', () => {
+  const oldMemberRoles: Collection<string, Role> = new Collection<string, Role>()
+  oldMemberRoles.set('1', buildFakeRole('01', 'Role01'))
+  oldMemberRoles.set('2', buildFakeRole('02', 'Role02'))
+
+  const newMemberRoles: Collection<string, Role> = new Collection<string, Role>()
+  newMemberRoles.set('1', buildFakeRole('01', 'Role01'))
+  newMemberRoles.set('2', buildFakeRole('02', 'Role02'))
+  newMemberRoles.set('3', buildFakeRole('03', 'Role03'))
+
+  const oldMember: GuildMember = <GuildMember>{ roles: { cache: oldMemberRoles }, guild: { id: "guildid" } }
+  const newMember: GuildMember = <GuildMember>{ roles: { cache: newMemberRoles }, guild: { id: "guildid" } }
+  const output = filterRolesFromMemberUpdate(oldMember, newMember)
+
+  const expectedAddedRoles: Collection<string, Role> = new Collection<string, Role>()
+  expectedAddedRoles.set('3', buildFakeRole('03', 'Role03'))
+  const expectedRemovedRoles: Collection<string, Role> = new Collection<string, Role>()
+
+  expect(output.addedRoles).toEqual(expectedAddedRoles)
+  expect(output.removedRoles).toEqual(expectedRemovedRoles)
+})