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package tracing
// Copyright 2018 Microsoft Corporation
//
// 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.
import (
"context"
"net/http"
"testing"
)
func TestDisabled(t *testing.T) {
if IsEnabled() {
t.Fatal("unexpected enabled tracing")
}
if tr := NewTransport(&http.Transport{}); tr != nil {
t.Fatal("unexpected non-nil transport")
}
if ctx := StartSpan(context.Background(), "foo"); ctx != context.Background() {
t.Fatal("contexts don't match")
}
}
func TestEnabled(t *testing.T) {
mt := mockTracer{}
Register(&mt)
if !IsEnabled() {
t.Fatal("unexpected disabled tracing")
}
if tr := NewTransport(&http.Transport{}); tr != http.DefaultTransport {
t.Fatal("didn't receive expected transport")
}
ctx := StartSpan(context.Background(), "foo")
v := ctx.Value(mockTracer{})
if val, ok := v.(string); !ok {
t.Fatal("unexpected value type")
} else if val != "foo" {
t.Fatal("unexpected value")
}
EndSpan(ctx, http.StatusOK, nil)
if !mt.ended {
t.Fatal("EndSpan didn't forward call to registered tracer")
}
}
type mockTracer struct {
ended bool
}
func (m mockTracer) NewTransport(base *http.Transport) http.RoundTripper {
return http.DefaultTransport
}
func (m mockTracer) StartSpan(ctx context.Context, name string) context.Context {
return context.WithValue(ctx, mockTracer{}, name)
}
func (m *mockTracer) EndSpan(ctx context.Context, httpStatusCode int, err error) {
m.ended = true
}
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