cmd: Unit tests for extractMaxSequenceNumber

This commit simply adds two small unit tests for the
extractMaxSequenceNumber function. The first test covers the bug fixed
in the previous commit.

Signed-off-by: Paul Chaignon <paul.chaignon@gmail.com>

cilium/cmd/encrypt_status_test.go

@@ -119,3 +119,43 @@ func (s *EncryptStatusSuite) TestGetXfrmStats(c *C) {
 	}
 	c.Assert(currentCount, Equals, errCount)
 }
+
+func (s *EncryptStatusSuite) TestExtractMaxSequenceNumber(c *C) {
+	ipOutput := `src 10.84.1.32 dst 10.84.0.30
+	proto esp spi 0x00000003 reqid 1 mode tunnel
+	replay-window 0
+	mark 0x3cb23e00/0xffffff00 output-mark 0xe00/0xf00
+	aead rfc4106(gcm(aes)) 0x64ad37a9d8a8f20fb2e74ef6000f9d580898719f 128
+	anti-replay context: seq 0x0, oseq 0xc3, bitmap 0x00000000
+	sel src 0.0.0.0/0 dst 0.0.0.0/0
+src 0.0.0.0 dst 10.84.1.32
+	proto esp spi 0x00000003 reqid 1 mode tunnel
+	replay-window 0
+	mark 0xd00/0xf00 output-mark 0xd00/0xf00
+	aead rfc4106(gcm(aes)) 0x64ad37a9d8a8f20fb2e74ef6000f9d580898719f 128
+	anti-replay context: seq 0x0, oseq 0x1410, bitmap 0x00000000
+	sel src 0.0.0.0/0 dst 0.0.0.0/0
+src 10.84.1.32 dst 10.84.2.145
+	proto esp spi 0x00000003 reqid 1 mode tunnel
+	replay-window 0
+	mark 0x7e63e00/0xffffff00 output-mark 0xe00/0xf00
+	aead rfc4106(gcm(aes)) 0x64ad37a9d8a8f20fb2e74ef6000f9d580898719f 128
+	anti-replay context: seq 0x0, oseq 0x13e0, bitmap 0x00000000
+	sel src 0.0.0.0/0 dst 0.0.0.0/0`
+
+	maxSeqNumber := extractMaxSequenceNumber(ipOutput)
+	c.Assert(maxSeqNumber, Equals, int64(0x1410))
+}
+
+// Attempt to simulate a case where the output would be interrupted mid-sentence.
+func (s *EncryptStatusSuite) TestExtractMaxSequenceNumberError(c *C) {
+	ipOutput := `src 10.84.1.32 dst 10.84.0.30
+	proto esp spi 0x00000003 reqid 1 mode tunnel
+	replay-window 0
+	mark 0x3cb23e00/0xffffff00 output-mark 0xe00/0xf00
+	aead rfc4106(gcm(aes)) 0x64ad37a9d8a8f20fb2e74ef6000f9d580898719f 128
+	anti-replay context: seq 0x0, oseq 0x`
+
+	maxSeqNumber := extractMaxSequenceNumber(ipOutput)
+	c.Assert(maxSeqNumber, Equals, int64(0))
+}