github.com/thiagoyeds/go-cloud@v0.26.0/server/health/health_test.go (about)

     1  // Copyright 2018 The Go Cloud Development Kit Authors
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     https://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package health
    16  
    17  import (
    18  	"errors"
    19  	"net/http"
    20  	"net/http/httptest"
    21  	"sync"
    22  	"testing"
    23  )
    24  
    25  func TestNewHandler(t *testing.T) {
    26  	s := httptest.NewServer(new(Handler))
    27  	defer s.Close()
    28  	code, err := check(s)
    29  	if err != nil {
    30  		t.Fatalf("GET %s: %v", s.URL, err)
    31  	}
    32  	if code != http.StatusOK {
    33  		t.Errorf("got HTTP status %d; want %d", code, http.StatusOK)
    34  	}
    35  }
    36  
    37  func TestChecker(t *testing.T) {
    38  	c1 := &checker{err: errors.New("checker 1 down")}
    39  	c2 := &checker{err: errors.New("checker 2 down")}
    40  	h := new(Handler)
    41  	h.Add(c1)
    42  	h.Add(c2)
    43  	s := httptest.NewServer(h)
    44  	defer s.Close()
    45  
    46  	t.Run("AllUnhealthy", func(t *testing.T) {
    47  		code, err := check(s)
    48  		if err != nil {
    49  			t.Fatalf("GET %s: %v", s.URL, err)
    50  		}
    51  		if code != http.StatusInternalServerError {
    52  			t.Errorf("got HTTP status %d; want %d", code, http.StatusInternalServerError)
    53  		}
    54  	})
    55  	c1.set(nil)
    56  	t.Run("PartialHealthy", func(t *testing.T) {
    57  		code, err := check(s)
    58  		if err != nil {
    59  			t.Fatalf("GET %s: %v", s.URL, err)
    60  		}
    61  		if code != http.StatusInternalServerError {
    62  			t.Errorf("got HTTP status %d; want %d", code, http.StatusInternalServerError)
    63  		}
    64  	})
    65  	c2.set(nil)
    66  	t.Run("AllHealthy", func(t *testing.T) {
    67  		code, err := check(s)
    68  		if err != nil {
    69  			t.Fatalf("GET %s: %v", s.URL, err)
    70  		}
    71  		if code != http.StatusOK {
    72  			t.Errorf("got HTTP status %d; want %d", code, http.StatusOK)
    73  		}
    74  	})
    75  }
    76  
    77  func check(s *httptest.Server) (code int, err error) {
    78  	resp, err := http.Get(s.URL)
    79  	if err != nil {
    80  		return 0, err
    81  	}
    82  	resp.Body.Close()
    83  	return resp.StatusCode, nil
    84  }
    85  
    86  type checker struct {
    87  	mu  sync.Mutex
    88  	err error
    89  }
    90  
    91  func (c *checker) CheckHealth() error {
    92  	defer c.mu.Unlock()
    93  	c.mu.Lock()
    94  	return c.err
    95  }
    96  
    97  func (c *checker) set(e error) {
    98  	defer c.mu.Unlock()
    99  	c.mu.Lock()
   100  	c.err = e
   101  }