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assertions.go
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assertions.go
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package httpfake
import (
"bytes"
"fmt"
"io"
"net/http"
"reflect"
"strings"
"testing"
"github.com/tidwall/gjson"
)
const assertErrorTemplate = "assertion error: %s"
// Assertor provides an interface for setting assertions for http requests.
type Assertor interface {
Assert(r *http.Request) error
Log(t testing.TB)
Error(t testing.TB, err error)
}
// requiredHeaders provides an Assertor for the presence of the provided http header keys.
type requiredHeaders struct {
Keys []string
}
// Assert runs the required headers assertion against the provided request.
func (h *requiredHeaders) Assert(r *http.Request) error {
var missingHeaders []string
for _, key := range h.Keys {
if value := r.Header.Get(key); len(value) == 0 {
missingHeaders = append(missingHeaders, key)
}
}
if len(missingHeaders) > 0 {
return fmt.Errorf("missing required header(s): %s", strings.Join(missingHeaders, ", "))
}
return nil
}
// Log prints a testing info log for the requiredHeaders Assertor.
func (h *requiredHeaders) Log(t testing.TB) {
t.Log("Testing request for required headers")
}
// Error prints a testing error for the requiredHeaders Assertor.
func (h *requiredHeaders) Error(t testing.TB, err error) {
t.Errorf(assertErrorTemplate, err)
}
// requiredHeaderValue provides an Assertor for a header and its expected value.
type requiredHeaderValue struct {
Key string
ExpectedValue string
}
// Assert runs the required header value assertion against the provided request.
func (h *requiredHeaderValue) Assert(r *http.Request) error {
if value := r.Header.Get(h.Key); value != h.ExpectedValue {
return fmt.Errorf("header %s does not have the expected value; expected %s to equal %s",
h.Key,
value,
h.ExpectedValue)
}
return nil
}
// Log prints a testing info log for the requiredHeaderValue Assertor.
func (h *requiredHeaderValue) Log(t testing.TB) {
t.Logf("Testing request for a required header value [%s: %s]", h.Key, h.ExpectedValue)
}
// Error prints a testing error for the requiredHeaderValue Assertor.
func (h *requiredHeaderValue) Error(t testing.TB, err error) {
t.Errorf(assertErrorTemplate, err)
}
// requiredQueries provides an Assertor for the presence of the provided query parameter keys.
type requiredQueries struct {
Keys []string
}
// Assert runs the required queries assertion against the provided request.
func (q *requiredQueries) Assert(r *http.Request) error {
queryVals := r.URL.Query()
var missingParams []string
for _, key := range q.Keys {
if value := queryVals.Get(key); len(value) == 0 {
missingParams = append(missingParams, key)
}
}
if len(missingParams) > 0 {
return fmt.Errorf("missing required query parameter(s): %s", strings.Join(missingParams, ", "))
}
return nil
}
// Log prints a testing info log for the requiredQueries Assertor.
func (q *requiredQueries) Log(t testing.TB) {
t.Log("Testing request for required query parameters")
}
// Error prints a testing error for the requiredQueries Assertor.
func (q *requiredQueries) Error(t testing.TB, err error) {
t.Errorf(assertErrorTemplate, err)
}
// requiredQueryValue provides an Assertor for a query parameter and its expected value.
type requiredQueryValue struct {
Key string
ExpectedValue string
}
// Assert runs the required query value assertion against the provided request.
func (q *requiredQueryValue) Assert(r *http.Request) error {
if value := r.URL.Query().Get(q.Key); value != q.ExpectedValue {
return fmt.Errorf("query %s does not have the expected value; expected %s to equal %s", q.Key, value, q.ExpectedValue)
}
return nil
}
// Log prints a testing info log for the requiredQueryValue Assertor.
func (q *requiredQueryValue) Log(t testing.TB) {
t.Logf("Testing request for a required query parameter value [%s: %s]", q.Key, q.ExpectedValue)
}
// Error prints a testing error for the requiredQueryValue Assertor.
func (q *requiredQueryValue) Error(t testing.TB, err error) {
t.Errorf(assertErrorTemplate, err)
}
// requiredBody provides an Assertor for the expected value of the request body.
type requiredBody struct {
ExpectedBody []byte
}
// Assert runs the required body assertion against the provided request.
func (b *requiredBody) Assert(r *http.Request) error {
if r.Body == nil {
return fmt.Errorf("error reading the request body; the request body is nil")
}
body, err := io.ReadAll(r.Body)
if err != nil {
return fmt.Errorf("error reading the request body: %s", err.Error())
}
if !bytes.EqualFold(b.ExpectedBody, body) {
return fmt.Errorf("request body does not have the expected value; expected %s to equal %s",
string(body),
string(b.ExpectedBody))
}
return nil
}
// Log prints a testing info log for the requiredBody Assertor.
func (b *requiredBody) Log(t testing.TB) {
t.Log("Testing request for a required body value")
}
// Error prints a testing error for the requiredBody Assertor.
func (b *requiredBody) Error(t testing.TB, err error) {
t.Errorf(assertErrorTemplate, err)
}
// CustomAssertor provides a function signature that implements the Assertor interface. This allows for
// adhoc creation of a custom assertion for use with the AssertCustom assertor.
type CustomAssertor func(r *http.Request) error
// Assert runs the CustomAssertor assertion against the provided request.
func (c CustomAssertor) Assert(r *http.Request) error {
return c(r)
}
// Log prints a testing info log for the CustomAssertor.
func (c CustomAssertor) Log(t testing.TB) {
t.Log("Testing request with a custom assertor")
}
// Error prints a testing error for the CustomAssertor.
func (c CustomAssertor) Error(t testing.TB, err error) {
t.Errorf(assertErrorTemplate, err)
}
type subJSON struct {
necessaryFields map[string]any
}
type gjsonForEachFunc func(key, value gjson.Result) bool
func (j *subJSON) fillFunc(keyPrefix string) gjsonForEachFunc {
return func(key, value gjson.Result) bool {
keyString := key.String()
if keyPrefix != "" {
keyString = fmt.Sprintf("%s.%s", keyPrefix, keyString)
}
if value.IsArray() || value.IsObject() {
value.ForEach(j.fillFunc(keyString))
return true
}
j.necessaryFields[keyString] = value.Value()
return true
}
}
func (j *subJSON) Assert(r *http.Request) error {
bodyBytes, err := io.ReadAll(r.Body)
if err != nil {
return err
}
_ = r.Body.Close()
r.Body = io.NopCloser(bytes.NewBuffer(bodyBytes))
js := gjson.ParseBytes(bodyBytes)
var assertionError error
for key, value := range j.necessaryFields {
bodyValue := js.Get(key).Value()
if !reflect.DeepEqual(bodyValue, value) {
assertionError = fmt.Errorf(`json assertion failed for "%s" field: expected "%v", got "%v"`, key, value, bodyValue)
break
}
}
return assertionError
}
func (j *subJSON) Log(t testing.TB) {
t.Log("Testing request for a required json fields")
}
func (j *subJSON) Error(t testing.TB, err error) {
t.Errorf(assertErrorTemplate, err)
}