Adding upstream version 0.28.1.

Signed-off-by: Daniel Baumann <daniel@debian.org>

tests/validation_errors.go

@@ -0,0 +1,32 @@
+package tests
+
+import (
+	"errors"
+	"testing"
+
+	validation "github.com/go-ozzo/ozzo-validation/v4"
+)
+
+// TestValidationErrors checks whether the provided rawErrors are
+// instance of [validation.Errors] and contains the expectedErrors keys.
+func TestValidationErrors(t *testing.T, rawErrors error, expectedErrors []string) {
+	var errs validation.Errors
+
+	if rawErrors != nil && !errors.As(rawErrors, &errs) {
+		t.Fatalf("Failed to parse errors, expected to find validation.Errors, got %T\n%v", rawErrors, rawErrors)
+	}
+
+	if len(errs) != len(expectedErrors) {
+		keys := make([]string, 0, len(errs))
+		for k := range errs {
+			keys = append(keys, k)
+		}
+		t.Fatalf("Expected error keys \n%v\ngot\n%v\n%v", expectedErrors, keys, errs)
+	}
+
+	for _, k := range expectedErrors {
+		if _, ok := errs[k]; !ok {
+			t.Fatalf("Missing expected error key %q in %v", k, errs)
+		}
+	}
+}