internal middleware: added tests

middleware/internal/internal_test.go

+package internal
+
+import (
+	"fmt"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"github.com/mholt/caddy/middleware"
+)
+
+func TestInternal(t *testing.T) {
+	im := Internal{
+		Next:  middleware.HandlerFunc(internalTestHandlerFunc),
+		Paths: []string{"/internal"},
+	}
+
+	tests := []struct {
+		url          string
+		expectedCode int
+		expectedBody string
+	}{
+		{"/internal", http.StatusNotFound, ""},
+
+		{"/public", 0, "/public"},
+		{"/public/internal", 0, "/public/internal"},
+
+		{"/redirect", 0, "/internal"},
+
+		{"/cycle", http.StatusInternalServerError, ""},
+	}
+
+	for i, test := range tests {
+		req, err := http.NewRequest("GET", test.url, nil)
+		if err != nil {
+			t.Fatalf("Test %d: Could not create HTTP request: %v", i, err)
+		}
+
+		rec := httptest.NewRecorder()
+		code, err := im.ServeHTTP(rec, req)
+
+		if code != test.expectedCode {
+			t.Errorf("Test %d: Expected status code %d for %s, but got %d",
+				i, test.expectedCode, test.url, code)
+		}
+		if rec.Body.String() != test.expectedBody {
+			t.Errorf("Test %d: Expected body '%s' for %s, but got '%s'",
+				i, test.expectedBody, test.url, rec.Body.String())
+		}
+	}
+}
+
+func internalTestHandlerFunc(w http.ResponseWriter, r *http.Request) (int, error) {
+	switch r.URL.Path {
+	case "/redirect":
+		w.Header().Set("X-Accel-Redirect", "/internal")
+	case "/cycle":
+		w.Header().Set("X-Accel-Redirect", "/cycle")
+	}
+	w.WriteHeader(http.StatusOK)
+	fmt.Fprintf(w, r.URL.String())
+
+	return 0, nil
+}