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// Copyright 2024 The Prometheus Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package remote
import (
"net/http"
"net/http/httptest"
"testing"
"github.com/google/go-cmp/cmp"
"github.com/google/go-cmp/cmp/cmpopts"
)
func TestWriteResponse(t *testing.T) {
t.Run("new response has empty headers", func(t *testing.T) {
resp := NewWriteResponse()
if len(resp.ExtraHeaders()) != 0 {
t.Errorf("expected empty headers, got %v", resp.ExtraHeaders())
}
})
t.Run("setters and getters", func(t *testing.T) {
resp := NewWriteResponse()
resp.SetStatusCode(http.StatusOK)
if got := resp.StatusCode(); got != http.StatusOK {
t.Errorf("expected status code %d, got %d", http.StatusOK, got)
}
stats := WriteResponseStats{
Samples: 10,
Histograms: 5,
Exemplars: 2,
confirmed: true,
}
resp.Add(stats)
if diff := cmp.Diff(stats, resp.Stats(), cmpopts.IgnoreUnexported(WriteResponseStats{})); diff != "" {
t.Errorf("stats mismatch (-want +got):\n%s", diff)
}
toAdd := WriteResponseStats{
Samples: 10,
Histograms: 5,
Exemplars: 2,
confirmed: true,
}
resp.Add(toAdd)
if diff := cmp.Diff(WriteResponseStats{
Samples: 20,
Histograms: 10,
Exemplars: 4,
confirmed: true,
}, resp.Stats(), cmpopts.IgnoreUnexported(WriteResponseStats{})); diff != "" {
t.Errorf("stats mismatch (-want +got):\n%s", diff)
}
resp.SetExtraHeader("Test-Header", "test-value")
if got := resp.ExtraHeaders().Get("Test-Header"); got != "test-value" {
t.Errorf("expected header value %q, got %q", "test-value", got)
}
})
t.Run("set headers on response writer", func(t *testing.T) {
resp := NewWriteResponse()
resp.Add(WriteResponseStats{
Samples: 10,
Histograms: 5,
Exemplars: 2,
confirmed: true,
})
resp.SetExtraHeader("Custom-Header", "custom-value")
w := httptest.NewRecorder()
resp.SetHeaders(w)
expectedHeaders := map[string]string{
"Custom-Header": "custom-value",
"X-Prometheus-Remote-Write-Samples-Written": "10",
"X-Prometheus-Remote-Write-Histograms-Written": "5",
"X-Prometheus-Remote-Write-Exemplars-Written": "2",
}
for k, want := range expectedHeaders {
if got := w.Header().Get(k); got != want {
t.Errorf("header %q: want %q, got %q", k, want, got)
}
}
})
}
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