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upfront_test.go
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upfront_test.go
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package upfront
import (
"bytes"
"encoding/json"
"fmt"
"io"
"net/http"
"net/http/httptest"
"testing"
)
// Decodes the body or else
func decode[T any](r io.Reader) T {
var t T
if err := json.NewDecoder(r).Decode(&t); err != nil {
panic(fmt.Sprintf("error decoding: %s", err))
}
return t
}
// Encodes the body or else
func encode[T any](t T) *bytes.Buffer {
byts, err := json.Marshal(t)
if err != nil {
panic(fmt.Sprintf("error encoding: %s", err))
}
return bytes.NewBuffer(byts)
}
type Response struct {
Name string `json:"name"`
}
type Err struct {
Message string `json:"message"`
}
func TestOKResultHandler(t *testing.T) {
handler := Handler[Response, Err](func(in Request) Result[Response, Err] {
return OKResult[Response, Err](
Response{
Name: "James",
},
http.StatusOK,
)
})
// Test inputs to our ServeHTTP func
rec := httptest.NewRecorder()
req := httptest.NewRequest(http.MethodGet, "http://example.com", nil)
handler.ServeHTTP(rec, req)
resp := rec.Result()
defer resp.Body.Close()
// Should be a good code and response
if want, got := http.StatusOK, resp.StatusCode; want != got {
t.Fatalf("expected status code %d, instead got: %d", want, got)
}
response := decode[Response](resp.Body)
if want, got := "James", response.Name; want != got {
t.Fatalf("expected name to be '%s', instead got: '%s'", want, got)
}
}
func TestErrResultHandler(t *testing.T) {
handler := Handler[Response, Err](func(in Request) Result[Response, Err] {
return ErrResult[Response, Err](
Err{
Message: "could not find that record",
},
http.StatusNotFound,
)
})
// Test inputs to our ServeHTTP func
rec := httptest.NewRecorder()
req := httptest.NewRequest(http.MethodGet, "http://example.com", nil)
handler.ServeHTTP(rec, req)
resp := rec.Result()
defer resp.Body.Close()
// Should be a not found code and response
if want, got := http.StatusNotFound, resp.StatusCode; want != got {
t.Fatalf("expected status code %d, instead got: %d", want, resp.StatusCode)
}
e := decode[Err](resp.Body)
if want, got := "could not find that record", e.Message; want != got {
t.Fatalf("expected error message to be '%s', instead got: '%s'", want, got)
}
}
type Input struct {
Name string `json:"name"`
}
func TestOKResultBodyHandler(t *testing.T) {
handler := BodyHandler[Input, Response, Err](func(in BodyRequest[Input]) Result[Response, Err] {
if want, got := "Ryn", in.Body.Name; want != got {
t.Fatalf("expected name in request body '%s', instead got: '%s'", want, got)
}
return OKResult[Response, Err](
Response{
Name: "Corynth",
},
http.StatusOK,
)
})
// Test inputs to our ServeHTTP func
rec := httptest.NewRecorder()
body := Input{
Name: "Ryn",
}
req := httptest.NewRequest(http.MethodPost, "http://example.com", encode(body))
handler.ServeHTTP(rec, req)
resp := rec.Result()
defer resp.Body.Close()
// Should be a not found code and response
if want, got := http.StatusOK, resp.StatusCode; want != got {
t.Fatalf("expected status code %d, instead got: %d", want, resp.StatusCode)
}
response := decode[Response](resp.Body)
if want, got := "Corynth", response.Name; want != got {
t.Fatalf("expected '%s', instead got: '%s'", want, got)
}
}