test(cors): enhance CORS wildcard handling tests (#145)

- Import the `reflect` package in `cors_test.go`
- Add new test cases for parsing wildcard rules in CORS configuration
- Implement tests to check for panic on multiple wildcards and validate expected results for various wildcard scenarios

ref: #106

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>

cors_test.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"net/http"
 	"net/http/httptest"
+	"reflect"
 	"strings"
 	"testing"
 	"time"
@@ -462,3 +463,93 @@ func TestParseWildcardRules_InvalidWildcard(t *testing.T) {
 		config.parseWildcardRules()
 	})
 }
+
+func TestParseWildcardRules(t *testing.T) {
+	tests := []struct {
+		name           string
+		config         Config
+		expectedResult [][]string
+		expectPanic    bool
+	}{
+		{
+			name: "Wildcard not allowed",
+			config: Config{
+				AllowWildcard: false,
+				AllowOrigins:  []string{"http://example.com", "https://*.domain.com"},
+			},
+			expectedResult: nil,
+			expectPanic:    false,
+		},
+		{
+			name: "No wildcards",
+			config: Config{
+				AllowWildcard: true,
+				AllowOrigins:  []string{"http://example.com", "https://example.com"},
+			},
+			expectedResult: nil,
+			expectPanic:    false,
+		},
+		{
+			name: "Single wildcard at the end",
+			config: Config{
+				AllowWildcard: true,
+				AllowOrigins:  []string{"http://*.example.com"},
+			},
+			expectedResult: [][]string{{"http://", ".example.com"}},
+			expectPanic:    false,
+		},
+		{
+			name: "Single wildcard at the beginning",
+			config: Config{
+				AllowWildcard: true,
+				AllowOrigins:  []string{"*.example.com"},
+			},
+			expectedResult: [][]string{{"*", ".example.com"}},
+			expectPanic:    false,
+		},
+		{
+			name: "Single wildcard in the middle",
+			config: Config{
+				AllowWildcard: true,
+				AllowOrigins:  []string{"http://example.*.com"},
+			},
+			expectedResult: [][]string{{"http://example.", ".com"}},
+			expectPanic:    false,
+		},
+		{
+			name: "Multiple wildcards should panic",
+			config: Config{
+				AllowWildcard: true,
+				AllowOrigins:  []string{"http://*.*.com"},
+			},
+			expectedResult: nil,
+			expectPanic:    true,
+		},
+		{
+			name: "Single wildcard in the end",
+			config: Config{
+				AllowWildcard: true,
+				AllowOrigins:  []string{"http://example.com/*"},
+			},
+			expectedResult: [][]string{{"http://example.com/", "*"}},
+			expectPanic:    false,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if tt.expectPanic {
+				defer func() {
+					if r := recover(); r == nil {
+						t.Errorf("The code did not panic")
+					}
+				}()
+			}
+
+			result := tt.config.parseWildcardRules()
+			if !tt.expectPanic && !reflect.DeepEqual(result, tt.expectedResult) {
+				t.Errorf("Name: %v, Expected %v, got %v", tt.name, tt.expectedResult, result)
+			}
+		})
+	}
+}