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Add Singleton Pattern 馃帀 #3

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@@ -0,0 +1,27 @@
package patterns

// HTTPRequest struct
type HTTPRequest struct {
count int
}

var httpService *HTTPRequest

// GetHTTPRequestService function returns a HTTPRequest
func GetHTTPRequestService() *HTTPRequest {
if httpService == nil {
httpService = new(HTTPRequest)
}

return httpService
}

// MakeRequest method on HTTPRequest struct
func (r *HTTPRequest) MakeRequest() {
r.count++
}

// GetNumberOfRequests method on HTTPRequest struct
func (r *HTTPRequest) GetNumberOfRequests() int {
return r.count
}
@@ -0,0 +1,27 @@
package patterns

import "testing"

func TestGetHTTPRequestService(t *testing.T) {
firstRequest := GetHTTPRequestService()
if firstRequest == nil {
t.Error("A new connection must have been made")
}
expectedCounter := firstRequest

firstRequest.MakeRequest()

if currentCount := firstRequest.GetNumberOfRequests(); currentCount != 1 {
t.Errorf("After calling http service for the first time, the count must be 1 but it is %d\n", currentCount)
}

secondRequest := GetHTTPRequestService()
if secondRequest != expectedCounter {
t.Error("Singleton instances must be different")
}

secondRequest.MakeRequest()
if currentCount := secondRequest.GetNumberOfRequests(); currentCount != 2 {
t.Errorf("After calling http service for the second time using different request instance, the current count must be 2 but was %d\n", currentCount)
}
}
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