Create initial backend (#7)

Closes #3

Reviewed-on: #7

backend/api_test.go

@@ -0,0 +1,25 @@
+package main
+
+import (
+	"testing"
+)
+import "github.com/gavv/httpexpect/v2"
+
+func startServer(t *testing.T) {
+	config := ServerConfig{
+		Datasource: ":memory:",
+		Port:       "8181",
+		Started:    make(chan bool),
+	}
+	go start(t.Context(), &config)
+	<-config.Started
+}
+
+func TestGetUsers(t *testing.T) {
+	startServer(t)
+	e := httpexpect.Default(t, "http://localhost:8181/api")
+	result := e.GET("/users").Expect().Status(200).JSON()
+	result.Array().Length().IsEqual(2)
+	result.Path("$[0].name").InList("Seeseemelk", "Huffle")
+	result.Path("$[1].name").InList("Seeseemelk", "Huffle")
+}