sys: Add test cases

sys/fcntl_test.go

@@ -0,0 +1,30 @@
+package sys
+
+import (
+	"syscall"
+	"testing"
+)
+
+func mustNil(e error) {
+	if e != nil {
+		panic("error is not nil")
+	}
+}
+
+func TestGetSetNonblock(t *testing.T) {
+	var p [2]int
+	mustNil(syscall.Pipe(p[:]))
+	for _, b := range []bool{true, false} {
+		if e := SetNonblock(p[0], b); e != nil {
+			t.Errorf("SetNonblock(%v, %v) => %v, want <nil>", p[0], b, e)
+		}
+		if nb, e := GetNonblock(p[0]); nb != b || e != nil {
+			t.Errorf("GetNonblock(%v) => (%v, %v), want (%v, <nil>)", p[0], nb, e, b)
+		}
+	}
+	syscall.Close(p[0])
+	syscall.Close(p[1])
+	if e := SetNonblock(p[0], true); e == nil {
+		t.Errorf("SetNonblock(%v, true) => <nil>, want non-<nil>", p[0])
+	}
+}

sys/select_test.go

@@ -0,0 +1,53 @@
+package sys
+
+import (
+	"syscall"
+	"testing"
+)
+
+func TestFdSet(t *testing.T) {
+	fs := NewFdSet(42, 233)
+	fs.Set(77)
+	fds := []int{42, 233, 77}
+	for _, i := range fds {
+		if !fs.IsSet(i) {
+			t.Errorf("fs.IsSet(%d) => false, want true", i)
+		}
+	}
+	fs.Clear(233)
+	if fs.IsSet(233) {
+		t.Errorf("fs.IsSet(233) => true, want false")
+	}
+	fs.Zero()
+	for _, i := range fds {
+		if fs.IsSet(i) {
+			t.Errorf("fs.IsSet(%d) => true, want false", i)
+		}
+	}
+}
+
+func TestSelect(t *testing.T) {
+	var p1, p2 [2]int
+	mustNil(syscall.Pipe(p1[:]))
+	mustNil(syscall.Pipe(p2[:]))
+	fs := NewFdSet(p1[0], p2[0])
+	var maxfd int
+	if p1[0] > p2[0] {
+		maxfd = p1[0] + 1
+	} else {
+		maxfd = p2[0] + 1
+	}
+	go func() {
+		syscall.Write(p1[1], []byte("to p1"))
+		syscall.Write(p2[1], []byte("to p2"))
+		syscall.Close(p1[1])
+		syscall.Close(p2[1])
+	}()
+	n, e := Select(maxfd+1, fs, nil, nil, nil)
+	if n < 1 || e != nil {
+		t.Errorf("Select(%v, %v, nil, nil, nil) => (%v, %v), want (>=1, <nil>)",
+			maxfd+1, fs, n, e)
+	}
+	syscall.Close(p1[0])
+	syscall.Close(p2[0])
+}