Add /user/{userId} (#24)

Closes #9

Reviewed-on: #24

backend/api_test.go

@@ -5,7 +5,7 @@ import (
 )
 import "github.com/gavv/httpexpect/v2"
 
-func startServer(t *testing.T) {
+func startServer(t *testing.T) *httpexpect.Expect {
 	config := ServerConfig{
 		Datasource: ":memory:",
 		Port:       "8181",
@@ -13,13 +13,30 @@ func startServer(t *testing.T) {
 	}
 	go start(t.Context(), &config)
 	<-config.Started
+	return httpexpect.Default(t, "http://localhost:8181/api")
 }
 
 func TestGetUsers(t *testing.T) {
-	startServer(t)
-	e := httpexpect.Default(t, "http://localhost:8181/api")
+	e := startServer(t)
 	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")
 }
+
+func TestGetUser(t *testing.T) {
+	e := startServer(t)
+	result := e.GET("/user/1").Expect().Status(200).JSON().Object()
+	result.Value("name").IsEqual("Seeseemelk")
+	result.Value("id").IsEqual(1)
+}
+
+func TestGetUserUnknown(t *testing.T) {
+	e := startServer(t)
+	e.GET("/user/999").Expect().Status(404)
+}
+
+func TestGetUserBadId(t *testing.T) {
+	e := startServer(t)
+	e.GET("/user/bad-id").Expect().Status(400)
+}