tests: improve SEEK_DATA test for MacOS

(1)

Create a 1 GiB file instead of 1 TiB, because
apparently, on MacOS, the file (sometimes?) is not
created sparse, and fills up users' disks:

https://github.com/rfjakob/gocryptfs/issues/625

(2)

On darwin, SEEK_DATA is not the same as on Linux
( https://github.com/golang/go/commit/2f8b555de27198775f9606e001ef19b76efdb415 )
so use the value provided by the unix package.

2 files changed, 14 insertions, 16 deletions

diff --git a/tests/defaults/main_test.go b/tests/defaults/main_test.go
index 43019ba..0f31a72 100644
--- a/tests/defaults/main_test.go
+++ b/tests/defaults/main_test.go
@@ -14,6 +14,8 @@ import (
 	"syscall"
 	"testing"
 
+	"golang.org/x/sys/unix"
+
 	"github.com/rfjakob/gocryptfs/v2/tests/test_helpers"
 )
 
@@ -267,15 +269,15 @@ func TestCpWarnings(t *testing.T) {
 	}
 }
 
-// TestSeekData tests that fs.FileLseeker is implemented
+// TestSeekData tests that SEEK_DATA works
 func TestSeekData(t *testing.T) {
 	fn := filepath.Join(test_helpers.DefaultPlainDir, t.Name())
 	f, err := os.Create(fn)
 	if err != nil {
 		t.Fatal(err)
 	}
-	var oneTiB int64 = 1024 * 1024 * 1024 * 1024
-	if _, err = f.Seek(oneTiB, 0); err != nil {
+	var dataOffset int64 = 1024 * 1024 * 1024 // 1 GiB
+	if _, err = f.Seek(dataOffset, 0); err != nil {
 		t.Fatal(err)
 	}
 	if _, err = f.Write([]byte("foo")); err != nil {
@@ -283,18 +285,16 @@ func TestSeekData(t *testing.T) {
 	}
 	f.Close()
 
-	const SEEK_DATA = 3
-
 	f, err = os.Open(fn)
 	if err != nil {
 		t.Fatal(err)
 	}
-	off, err := f.Seek(1024*1024, SEEK_DATA)
+	off, err := f.Seek(1024*1024, unix.SEEK_DATA)
 	if err != nil {
 		t.Fatal(err)
 	}
-	if off < oneTiB-1024*1024 {
-		t.Errorf("off=%d, expected=%d\n", off, oneTiB)
+	if off < dataOffset-1024*1024 {
+		t.Errorf("off=%d, expected=%d\n", off, dataOffset)
 	}
 	f.Close()
 }
diff --git a/tests/reverse/correctness_test.go b/tests/reverse/correctness_test.go
index 090a468..4a5224c 100644
--- a/tests/reverse/correctness_test.go
+++ b/tests/reverse/correctness_test.go
@@ -259,7 +259,7 @@ func TestStatfs(t *testing.T) {
 	}
 }
 
-// TestSeekData tests that fs.FileLseeker is implemented
+// TestSeekData tests that SEEK_DATA works
 func TestSeekData(t *testing.T) {
 	if !plaintextnames {
 		t.Skip()
@@ -270,8 +270,8 @@ func TestSeekData(t *testing.T) {
 	if err != nil {
 		t.Fatal(err)
 	}
-	var oneTiB int64 = 1024 * 1024 * 1024 * 1024
-	if _, err = f.Seek(oneTiB, 0); err != nil {
+	var dataOffset int64 = 1 * 1024 * 1024 * 1024 // 1 GiB
+	if _, err = f.Seek(dataOffset, 0); err != nil {
 		t.Fatal(err)
 	}
 	if _, err = f.Write([]byte("foo")); err != nil {
@@ -279,19 +279,17 @@ func TestSeekData(t *testing.T) {
 	}
 	f.Close()
 
-	const SEEK_DATA = 3
-
 	fn2 := filepath.Join(dirB, t.Name())
 	f, err = os.Open(fn2)
 	if err != nil {
 		t.Fatal(err)
 	}
-	off, err := f.Seek(1024*1024, SEEK_DATA)
+	off, err := f.Seek(1024*1024, unix.SEEK_DATA)
 	if err != nil {
 		t.Fatal(err)
 	}
-	if off < oneTiB-1024*1024 {
-		t.Errorf("off=%d, expected=%d\n", off, oneTiB)
+	if off < dataOffset-1024*1024 {
+		t.Errorf("off=%d, expected=%d\n", off, dataOffset)
 	}
 	f.Close()
 }