tdd(users): add tests

fixes: $12c

internal/db/users.go

@@ -118,6 +118,13 @@ func (u *Users) Update(userid string, isRed33m bool) error {
 	return nil
 }
 
+/*
+Clean removes all user ids that are not logged in with a
+red33m passcode.
+
+🟡 This should not be hooked up to any public API on
+the website.
+*/
 func (u *Users) Clean() (int, error) {
 	u.Lock()
 	if u.isClosed {

internal/db/users_test.go

@@ -0,0 +1,70 @@
+package db
+
+import (
+	"os"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestUsers(t *testing.T) {
+	t.Parallel()
+	a := assert.New(t)
+
+	t.Run("Inits user txt file", func(*testing.T) {
+		dir := t.TempDir()
+
+		u, err := NewUsers(dir)
+		a.NoError(err, "should create new users dir")
+
+		b, err := os.ReadFile(dir + "/users.txt")
+		a.NoError(err, "should find users text file")
+		a.Equal(b, []byte{})
+
+		u.Close()
+	})
+
+	t.Run("adds user to users txt file", func(*testing.T) {
+		dir := t.TempDir()
+		u, err := NewUsers(dir)
+		a.NoError(err, "should create new users dir")
+
+		usrStr, err := u.Add(false)
+		a.NoError(err, "should add user")
+		a.Len(usrStr, 24, "should be a 24 char hash")
+		u.Close()
+	})
+
+	t.Run("sets & gets user state", func(*testing.T) {
+		dir := t.TempDir()
+		u, err := NewUsers(dir)
+		a.NoError(err, "should create new users dir")
+		defer u.Close()
+
+		usrStr, err := u.Add(false)
+		a.NoError(err, "should add user")
+		state, err := u.GetState(usrStr)
+		a.NoError(err, "should return state")
+		a.Equal(state, false, "user should NOT be red33med")
+
+		err = u.Update(usrStr, true)
+		a.NoError(err, "should update user state")
+		state, err = u.GetState(usrStr)
+		a.NoError(err, "should return state")
+		a.Equal(state, true, "user should be red33med")
+	})
+
+	t.Run("gets length of users", func(*testing.T) {
+		dir := t.TempDir()
+		u, err := NewUsers(dir)
+		a.NoError(err, "should create new users dir")
+		defer u.Close()
+
+		for range 10 {
+			_, err := u.Add(false)
+			a.NoError(err, "should add user")
+		}
+
+		a.Equal(u.GetLength(), 10, "there should be 10 users")
+	})
+}