improve the result of checking role name

pkg/api/validation/path/name.go

@@ -35,25 +35,27 @@ func IsValidPathSegmentName(name string) []string {
 		}
 	}
 
+	var errors []string
 	for _, illegalContent := range NameMayNotContain {
 		if strings.Contains(name, illegalContent) {
-			return []string{fmt.Sprintf(`may not contain '%s'`, illegalContent)}
+			errors = append(errors, fmt.Sprintf(`may not contain '%s'`, illegalContent))
 		}
 	}
 
-	return nil
+	return errors
 }
 
 // IsValidPathSegmentPrefix validates the name can be used as a prefix for a name which will be encoded as a path segment
 // It does not check for exact matches with disallowed names, since an arbitrary suffix might make the name valid
 func IsValidPathSegmentPrefix(name string) []string {
+	var errors []string
 	for _, illegalContent := range NameMayNotContain {
 		if strings.Contains(name, illegalContent) {
-			return []string{fmt.Sprintf(`may not contain '%s'`, illegalContent)}
+			errors = append(errors, fmt.Sprintf(`may not contain '%s'`, illegalContent))
 		}
 	}
 
-	return nil
+	return errors
 }
 
 // ValidatePathSegmentName validates the name can be safely encoded as a path segment

pkg/api/validation/path/name_test.go

@@ -130,3 +130,39 @@ func TestValidatePathSegmentName(t *testing.T) {
 		}
 	}
 }
+
+func TestValidateWithMultiErrors(t *testing.T) {
+	testcases := map[string]struct {
+		Name        string
+		Prefix      bool
+		ExpectedMsg []string
+	}{
+		"slash,percent": {
+			Name:        "foo//bar%",
+			Prefix:      false,
+			ExpectedMsg: []string{"may not contain '/'", "may not contain '%'"},
+		},
+		"slash,percent,prefix": {
+			Name:        "foo//bar%",
+			Prefix:      true,
+			ExpectedMsg: []string{"may not contain '/'", "may not contain '%'"},
+		},
+	}
+
+	for k, tc := range testcases {
+		msgs := ValidatePathSegmentName(tc.Name, tc.Prefix)
+		if len(tc.ExpectedMsg) == 0 && len(msgs) > 0 {
+			t.Errorf("%s: expected no message, got %v", k, msgs)
+		}
+		if len(tc.ExpectedMsg) > 0 && len(msgs) == 0 {
+			t.Errorf("%s: expected error message, got none", k)
+		}
+		if len(tc.ExpectedMsg) > 0 {
+			for i := 0; i < len(tc.ExpectedMsg); i++ {
+				if msgs[i] != tc.ExpectedMsg[i] {
+					t.Errorf("%s: expected message containing %q, got %v", k, tc.ExpectedMsg[i], msgs[i])
+				}
+			}
+		}
+	}
+}