httputil: add explicit healthcheck handler (#354)

Signed-off-by: Bobby DeSimone <bobbydesimone@gmail.com>

internal/httputil/handlers_test.go

@@ -0,0 +1,37 @@
+package httputil
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"testing"
+)
+
+func TestHealthCheck(t *testing.T) {
+	t.Parallel()
+	tests := []struct {
+		name   string
+		method string
+
+		wantStatus int
+	}{
+		{"good - Get", http.MethodGet, http.StatusOK},
+		{"good - Head", http.MethodHead, http.StatusOK},
+		{"bad - Options", http.MethodOptions, http.StatusMethodNotAllowed},
+		{"bad - Put", http.MethodPut, http.StatusMethodNotAllowed},
+		{"bad - Post", http.MethodPost, http.StatusMethodNotAllowed},
+		{"bad - route miss", http.MethodGet, http.StatusOK},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+
+			r := httptest.NewRequest(tt.method, "/", nil)
+			w := httptest.NewRecorder()
+
+			HealthCheck(w, r)
+			if w.Code != tt.wantStatus {
+				t.Errorf("code differs. got %d want %d body: %s", w.Code, tt.wantStatus, w.Body.String())
+			}
+		})
+	}
+}