Add negative integration tests for link syscalls (task 348)

Add three negative scenarios and tests:
- link-enoent: hard link to nonexistent source (ENOENT) via raw SYS_LINK
- link-symlink-eexist: symlink where target already exists (EEXIST) via raw SYS_SYMLINK
- link-readlinkat-einval: readlinkat on non-symlink file (EINVAL) via SYS_READLINKAT

All use raw syscalls to hit exact tracepoints. ior captures on syscall
entry, so even failed syscalls have their arguments recorded.

Amp-Thread-ID: https://ampcode.com/threads/T-019c81a2-693b-716f-9ed2-25a674f1fc9a
Co-authored-by: Amp <amp@ampcode.com>

1 files changed, 33 insertions, 0 deletions

diff --git a/integrationtests/link_test.go b/integrationtests/link_test.go
index fcebffb..4f92f6e 100644
--- a/integrationtests/link_test.go
+++ b/integrationtests/link_test.go
@@ -57,3 +57,36 @@ func TestLinkReadlinkat(t *testing.T) {
 		},
 	})
 }
+
+func TestLinkEnoent(t *testing.T) {
+	runScenario(t, "link-enoent", []ExpectedEvent{
+		{
+			PathContains: "link-enoent-missing.txt",
+			Tracepoint:   "enter_link",
+			Comm:         "ioworkload",
+			MinCount:     1,
+		},
+	})
+}
+
+func TestLinkSymlinkEexist(t *testing.T) {
+	runScenario(t, "link-symlink-eexist", []ExpectedEvent{
+		{
+			PathContains: "symlink-eexist.txt",
+			Tracepoint:   "enter_symlink",
+			Comm:         "ioworkload",
+			MinCount:     1,
+		},
+	})
+}
+
+func TestLinkReadlinkatEinval(t *testing.T) {
+	runScenario(t, "link-readlinkat-einval", []ExpectedEvent{
+		{
+			PathContains: "readlinkat-einval.txt",
+			Tracepoint:   "enter_readlinkat",
+			Comm:         "ioworkload",
+			MinCount:     1,
+		},
+	})
+}