feat(schema): schema diffing (#21374)

schema/diff/field_diff_test.go

@@ -0,0 +1,63 @@
+package diff
+
+import (
+	"fmt"
+	"reflect"
+	"testing"
+
+	"cosmossdk.io/schema"
+)
+
+func Test_compareField(t *testing.T) {
+	tests := []struct {
+		oldField schema.Field
+		newField schema.Field
+		wantDiff FieldDiff
+		trueF    func(FieldDiff) bool
+	}{
+		{
+			oldField: schema.Field{Kind: schema.Int32Kind},
+			newField: schema.Field{Kind: schema.Int32Kind},
+			wantDiff: FieldDiff{},
+			trueF:    FieldDiff.Empty,
+		},
+		{
+			oldField: schema.Field{Kind: schema.StringKind},
+			newField: schema.Field{Kind: schema.Int32Kind},
+			wantDiff: FieldDiff{
+				OldKind: schema.StringKind,
+				NewKind: schema.Int32Kind,
+			},
+			trueF: FieldDiff.KindChanged,
+		},
+		{
+			oldField: schema.Field{Kind: schema.StringKind},
+			newField: schema.Field{Kind: schema.StringKind, Nullable: true},
+			wantDiff: FieldDiff{
+				NewNullable: true,
+			},
+			trueF: FieldDiff.NullableChanged,
+		},
+		{
+			oldField: schema.Field{Kind: schema.EnumKind, EnumType: schema.EnumType{Name: "old"}},
+			newField: schema.Field{Kind: schema.EnumKind, EnumType: schema.EnumType{Name: "new"}},
+			wantDiff: FieldDiff{
+				OldEnumType: "old",
+				NewEnumType: "new",
+			},
+			trueF: FieldDiff.EnumTypeChanged,
+		},
+	}
+
+	for i, tt := range tests {
+		t.Run(fmt.Sprintf("%d", i), func(t *testing.T) {
+			gotDiff := compareField(tt.oldField, tt.newField)
+			if !reflect.DeepEqual(gotDiff, tt.wantDiff) {
+				t.Errorf("compareField() = %v, want %v", gotDiff, tt.wantDiff)
+			}
+			if tt.trueF != nil && !tt.trueF(gotDiff) {
+				t.Errorf("trueF() = false, want true")
+			}
+		})
+	}
+}