Add statistics in conn testing

Occasional error is observed when we execute long test
Print time and memory for better troubleshooting in the future

Co-authored-by: Jebbs <qjebbs@gmail.com>

common/units/bytesize_test.go

@@ -0,0 +1,66 @@
+package units_test
+
+import (
+	"testing"
+
+	"github.com/xtls/xray-core/common/units"
+)
+
+func TestByteSizes(t *testing.T) {
+	size := units.ByteSize(0)
+	assertSizeString(t, size, "0")
+	size++
+	assertSizeValue(t,
+		assertSizeString(t, size, "1.00B"),
+		size,
+	)
+	size <<= 10
+	assertSizeValue(t,
+		assertSizeString(t, size, "1.00KB"),
+		size,
+	)
+	size <<= 10
+	assertSizeValue(t,
+		assertSizeString(t, size, "1.00MB"),
+		size,
+	)
+	size <<= 10
+	assertSizeValue(t,
+		assertSizeString(t, size, "1.00GB"),
+		size,
+	)
+	size <<= 10
+	assertSizeValue(t,
+		assertSizeString(t, size, "1.00TB"),
+		size,
+	)
+	size <<= 10
+	assertSizeValue(t,
+		assertSizeString(t, size, "1.00PB"),
+		size,
+	)
+	size <<= 10
+	assertSizeValue(t,
+		assertSizeString(t, size, "1.00EB"),
+		size,
+	)
+}
+
+func assertSizeValue(t *testing.T, size string, expected units.ByteSize) {
+	actual := units.ByteSize(0)
+	err := actual.Parse(size)
+	if err != nil {
+		t.Error(err)
+	}
+	if actual != expected {
+		t.Errorf("expect %s, but got %s", expected, actual)
+	}
+}
+
+func assertSizeString(t *testing.T, size units.ByteSize, expected string) string {
+	actual := size.String()
+	if actual != expected {
+		t.Errorf("expect %s, but got %s", expected, actual)
+	}
+	return expected
+}