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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
package otelhttp_test
import (
"io"
"net/http"
"net/http/httptest"
"strings"
"testing"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
"go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp"
)
func TestHandler(t *testing.T) {
testCases := []struct {
name string
handler func(*testing.T) http.Handler
requestBody io.Reader
expectedStatusCode int
}{
{
name: "implements flusher",
handler: func(t *testing.T) http.Handler {
return otelhttp.NewHandler(
http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
assert.Implements(t, (*http.Flusher)(nil), w)
w.(http.Flusher).Flush()
_, _ = io.WriteString(w, "Hello, world!\n")
}), "test_handler",
)
},
expectedStatusCode: http.StatusOK,
},
{
name: "succeeds",
handler: func(t *testing.T) http.Handler {
return otelhttp.NewHandler(
http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
assert.NotNil(t, r.Body)
b, err := io.ReadAll(r.Body)
assert.NoError(t, err)
assert.Equal(t, "hello world", string(b))
}), "test_handler",
)
},
requestBody: strings.NewReader("hello world"),
expectedStatusCode: http.StatusOK,
},
{
name: "succeeds with a nil body",
handler: func(t *testing.T) http.Handler {
return otelhttp.NewHandler(
http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
assert.Nil(t, r.Body)
}), "test_handler",
)
},
expectedStatusCode: http.StatusOK,
},
{
name: "succeeds with an http.NoBody",
handler: func(t *testing.T) http.Handler {
return otelhttp.NewHandler(
http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
assert.Equal(t, http.NoBody, r.Body)
}), "test_handler",
)
},
requestBody: http.NoBody,
expectedStatusCode: http.StatusOK,
},
}
for _, tc := range testCases {
t.Run(tc.name, func(t *testing.T) {
r, err := http.NewRequest(http.MethodGet, "http://localhost/", tc.requestBody)
require.NoError(t, err)
rr := httptest.NewRecorder()
tc.handler(t).ServeHTTP(rr, r)
assert.Equal(t, tc.expectedStatusCode, rr.Result().StatusCode) //nolint:bodyclose // False positive for httptest.ResponseRecorder: https://github.com/timakin/bodyclose/issues/59.
})
}
}
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