Add validator lib

Signed-off-by: Bryan Frimin <bryan@getprobo.com>

pkg/validator/optional_pointer_test.go

@@ -0,0 +1,116 @@
+// Copyright (c) 2025 Probo Inc <hello@getprobo.com>.
+//
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
+// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+// AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+// INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+// LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
+// OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+// PERFORMANCE OF THIS SOFTWARE.
+
+package validator
+
+import (
+	"testing"
+
+	"go.probo.inc/probo/pkg/gid"
+)
+
+// CustomStringType simulates coredata.AssetType
+type CustomStringType string
+
+func (c CustomStringType) String() string {
+	return string(c)
+}
+
+func TestOptional_WithGIDPointer(t *testing.T) {
+	tenantID := gid.NewTenantID()
+
+	tests := []struct {
+		name        string
+		value       *gid.GID
+		expectError bool
+	}{
+		{
+			name:        "nil pointer - should skip validation",
+			value:       nil,
+			expectError: false,
+		},
+		{
+			name: "valid GID pointer",
+			value: func() *gid.GID {
+				g := gid.New(tenantID, 100)
+				return &g
+			}(),
+			expectError: false,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			v := New()
+			v.Check(tt.value, "owner_id", GID(100))
+
+			if tt.expectError {
+				if !v.HasErrors() {
+					t.Error("expected error but got none")
+				}
+			} else {
+				if v.HasErrors() {
+					t.Errorf("unexpected error: %v", v.Error())
+				}
+			}
+		})
+	}
+}
+
+func TestOptional_WithCustomTypePointer(t *testing.T) {
+	tests := []struct {
+		name        string
+		value       *CustomStringType
+		expectError bool
+	}{
+		{
+			name:        "nil pointer - should skip validation",
+			value:       nil,
+			expectError: false,
+		},
+		{
+			name: "valid custom type pointer",
+			value: func() *CustomStringType {
+				v := CustomStringType("VALID")
+				return &v
+			}(),
+			expectError: false,
+		},
+		{
+			name: "invalid custom type pointer",
+			value: func() *CustomStringType {
+				v := CustomStringType("INVALID")
+				return &v
+			}(),
+			expectError: true,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			v := New()
+			v.Check(tt.value, "asset_type", OneOf("VALID", "ANOTHER"))
+
+			if tt.expectError {
+				if !v.HasErrors() {
+					t.Error("expected error but got none")
+				}
+			} else {
+				if v.HasErrors() {
+					t.Errorf("unexpected error: %v", v.Error())
+				}
+			}
+		})
+	}
+}