From ea4f75a68465992c68779fc0cc4ea3ef251af05e Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Fri, 14 Nov 2025 08:36:12 +0000
Subject: Add comprehensive unit tests for lib package with 90.3% coverage

Co-authored-by: Loyalsoldier <10487845+Loyalsoldier@users.noreply.github.com>
---
 lib/error_test.go | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)
 create mode 100644 lib/error_test.go

(limited to 'lib/error_test.go')

diff --git a/lib/error_test.go b/lib/error_test.go
new file mode 100644
index 00000000..d73b1ec8
--- /dev/null
+++ b/lib/error_test.go
@@ -0,0 +1,36 @@
+package lib
+
+import (
+	"errors"
+	"testing"
+)
+
+func TestErrors(t *testing.T) {
+	tests := []struct {
+		name string
+		err  error
+	}{
+		{"ErrDuplicatedConverter", ErrDuplicatedConverter},
+		{"ErrUnknownAction", ErrUnknownAction},
+		{"ErrNotSupportedFormat", ErrNotSupportedFormat},
+		{"ErrInvalidIPType", ErrInvalidIPType},
+		{"ErrInvalidIP", ErrInvalidIP},
+		{"ErrInvalidIPLength", ErrInvalidIPLength},
+		{"ErrInvalidIPNet", ErrInvalidIPNet},
+		{"ErrInvalidCIDR", ErrInvalidCIDR},
+		{"ErrInvalidPrefix", ErrInvalidPrefix},
+		{"ErrInvalidPrefixType", ErrInvalidPrefixType},
+		{"ErrCommentLine", ErrCommentLine},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if tt.err == nil {
+				t.Errorf("%s should not be nil", tt.name)
+			}
+			if !errors.Is(tt.err, tt.err) {
+				t.Errorf("%s should match itself", tt.name)
+			}
+		})
+	}
+}
-- 
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