tracing_test.go

Documentation: github.com/Azure/go-autorest/tracing

     1  package tracing
     2  
     3  // Copyright 2018 Microsoft Corporation
     4  //
     5  //  Licensed under the Apache License, Version 2.0 (the "License");
     6  //  you may not use this file except in compliance with the License.
     7  //  You may obtain a copy of the License at
     8  //
     9  //      http://www.apache.org/licenses/LICENSE-2.0
    10  //
    11  //  Unless required by applicable law or agreed to in writing, software
    12  //  distributed under the License is distributed on an "AS IS" BASIS,
    13  //  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    14  //  See the License for the specific language governing permissions and
    15  //  limitations under the License.
    16  
    17  import (
    18  	"context"
    19  	"net/http"
    20  	"testing"
    21  )
    22  
    23  func TestDisabled(t *testing.T) {
    24  	if IsEnabled() {
    25  		t.Fatal("unexpected enabled tracing")
    26  	}
    27  	if tr := NewTransport(&http.Transport{}); tr != nil {
    28  		t.Fatal("unexpected non-nil transport")
    29  	}
    30  	if ctx := StartSpan(context.Background(), "foo"); ctx != context.Background() {
    31  		t.Fatal("contexts don't match")
    32  	}
    33  }
    34  
    35  func TestEnabled(t *testing.T) {
    36  	mt := mockTracer{}
    37  	Register(&mt)
    38  	if !IsEnabled() {
    39  		t.Fatal("unexpected disabled tracing")
    40  	}
    41  	if tr := NewTransport(&http.Transport{}); tr != http.DefaultTransport {
    42  		t.Fatal("didn't receive expected transport")
    43  	}
    44  	ctx := StartSpan(context.Background(), "foo")
    45  	v := ctx.Value(mockTracer{})
    46  	if val, ok := v.(string); !ok {
    47  		t.Fatal("unexpected value type")
    48  	} else if val != "foo" {
    49  		t.Fatal("unexpected value")
    50  	}
    51  	EndSpan(ctx, http.StatusOK, nil)
    52  	if !mt.ended {
    53  		t.Fatal("EndSpan didn't forward call to registered tracer")
    54  	}
    55  }
    56  
    57  type mockTracer struct {
    58  	ended bool
    59  }
    60  
    61  func (m mockTracer) NewTransport(base *http.Transport) http.RoundTripper {
    62  	return http.DefaultTransport
    63  }
    64  
    65  func (m mockTracer) StartSpan(ctx context.Context, name string) context.Context {
    66  	return context.WithValue(ctx, mockTracer{}, name)
    67  }
    68  
    69  func (m *mockTracer) EndSpan(ctx context.Context, httpStatusCode int, err error) {
    70  	m.ended = true
    71  }
    72
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