initial test for replacer

middleware/replacer_test.go

+package middleware
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+)
+
+func TestNewReplacer(t *testing.T) {
+	w := httptest.NewRecorder()
+	recordRequest := NewResponseRecorder(w)
+	userJson := `{"username": "dennis"}`
+
+	reader := strings.NewReader(userJson) //Convert string to reader
+
+	request, err := http.NewRequest("POST", "http://caddyserver.com", reader) //Create request with JSON body
+	if err != nil {
+		t.Fatalf("Request Formation Failed \n")
+	}
+	replaceValues := NewReplacer(request, recordRequest, "")
+
+	switch v := replaceValues.(type) {
+	case replacer:
+		if v.replacements["{host}"] != "caddyserver.com" {
+			t.Errorf("Expected host to be caddyserver.com")
+		}
+		if v.replacements["{method}"] != "POST" {
+			t.Errorf("Expected request method  to be POST")
+		}
+		if v.replacements["{status}"] != "200" {
+			t.Errorf("Expected status to be 200")
+		}
+
+	default:
+		t.Fatalf("Return Value from New Replacer expected pass type assertion into a replacer type   \n")
+	}
+}