test: add HTTP status code happy cases (#38)

Author: sashamelentyev

pkg/analyzer/internal/template/test-httpstatuscode.go.tmpl

@@ -22,6 +22,13 @@ func _() {
 }
 {{ end -}}
 
+{{ range $key, $value := .Mapping }}
+func _() {
+	var w http.ResponseWriter
+	w.WriteHeader({{ $value }})
+}
+{{ end -}}
+
 {{ range $key, $value := .Mapping }}
 func _() {
 	_ = &http.Response{
@@ -30,6 +37,14 @@ func _() {
 }
 {{ end -}}
 
+{{ range $key, $value := .Mapping }}
+func _() {
+	_ = &http.Response{
+		StatusCode: {{ $value }},
+	}
+}
+{{ end -}}
+
 {{ range $key, $value := .Mapping }}
 func _() error {
     resp, err := http.DefaultClient.Do(&http.Request{})