test: path characters regexp validation (kubernetes-sigs#1658)

apis/v1beta1/validation/httproute_test.go

@@ -17,6 +17,7 @@ limitations under the License.
 package validation
 
 import (
+	"regexp"
 	"testing"
 
 	"github.com/stretchr/testify/assert"
@@ -1140,3 +1141,40 @@ func TestValidateHTTPRouteTypeMatchesField(t *testing.T) {
 		})
 	}
 }
+
+func TestValidPathCharactersRegExp(t *testing.T) {
+	r, err := regexp.Compile(validPathCharacters)
+	assert.NoError(t, err)
+
+	tests := []struct {
+		name     string
+		sequence string
+		isValid  bool
+	}{{
+		name:     "valid sequence of alphabetic characters",
+		sequence: "mypath",
+		isValid:  true,
+	}, {
+		name:     "valid sequence of alphanumeric characters",
+		sequence: "mypath0123",
+		isValid:  true,
+	}, {
+		name:     "valid mix of alphanumeric characters and special characters",
+		sequence: "my%20path/123",
+		isValid:  true,
+	}, {
+		name:     "invalid sequence of special characters",
+		sequence: "[]",
+		isValid:  false,
+	}, {
+		name:     "invalid mix of alphanumeric characters of special characters",
+		sequence: "my[/]path",
+		isValid:  false,
+	}}
+
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			assert.Equal(t, tc.isValid, r.MatchString(tc.sequence))
+		})
+	}
+}