Add tests for file leak

fileleak/fileleak_test.go

@@ -4,12 +4,14 @@ import (
 	"bytes"
 	"fmt"
 	"io/ioutil"
+	"net"
 	"os"
 	"testing"
 
 	"github.com/stretchr/testify/require"
 
 	"gitlab.com/slon/shad-go/fileleak"
+	"gitlab.com/slon/shad-go/tools/testtool"
 )
 
 type fakeT struct {
@@ -77,3 +79,57 @@ func TestFileLeak_ReopenFile(t *testing.T) {
 		f = ff
 	})
 }
+
+func TestFileLeak_ReopenSameFile(t *testing.T) {
+	f, err := os.Open("/proc/self/exe")
+	require.NoError(t, err)
+	defer f.Close()
+
+	checkLeak(t, true, func() {
+		_ = f.Close()
+
+		ff, err := os.Open("/proc/self/exe")
+		require.NoError(t, err)
+		f = ff
+	})
+}
+
+func TestFileLeak_PipeLeak(t *testing.T) {
+	checkLeak(t, true, func() {
+		f, _, err := os.Pipe()
+		require.NoError(t, err)
+		_ = f.Close()
+	})
+}
+
+func TestFileLeak_PipeNoLeak(t *testing.T) {
+	checkLeak(t, false, func() {
+		f, w, err := os.Pipe()
+		require.NoError(t, err)
+		_, _ = f.Close(), w.Close()
+	})
+}
+
+func TestFileLeak_SocketLeak(t *testing.T) {
+	var conn net.Listener
+	defer conn.Close()
+
+	checkLeak(t, true, func() {
+		addr, err := testtool.GetFreePort()
+		require.NoError(t, err)
+
+		conn, err = net.Listen("tcp", addr)
+		require.NoError(t, err)
+	})
+}
+
+func TestFileLeak_SocketNoLeak(t *testing.T) {
+	checkLeak(t, false, func() {
+		addr, err := testtool.GetFreePort()
+		require.NoError(t, err)
+
+		conn, err := net.Listen("tcp", addr)
+		require.NoError(t, err)
+		_ = conn.Close()
+	})
+}