Feature/example test (#24)

example docs

byteUtil/byte_to_str_test.go

@@ -0,0 +1,22 @@
+package byteUtil
+
+import "testing"
+
+func TestBytesToStr(t *testing.T) {
+	tests := []struct {
+		name     string
+		data     []byte
+		expected string
+	}{
+		{"empty slice", []byte{}, ""},
+		{"non-empty slice", []byte{'h', 'e', 'l', 'l', 'o'}, "hello"},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := BytesToStr(tt.data)
+			if got != tt.expected {
+				t.Errorf("BytesToStr(%v) = %v, want %v", tt.data, got, tt.expected)
+			}
+		})
+	}
+}