diff --git a/timberjack_linux_test.go b/timberjack_linux_test.go
new file mode 100644
index 0000000..c610b32
--- /dev/null
+++ b/timberjack_linux_test.go
@@ -0,0 +1,116 @@
+package timberjack
+
+import (
+	"os"
+	"path/filepath"
+	"syscall"
+	"testing"
+)
+
+func TestRotate_OpenNewFails(t *testing.T) {
+	if os.Getuid() == 0 {
+		t.Skip("Skipping test when running as root")
+	}
+	badPath := "/bad/path/logfile.log"
+	if _, err := os.Stat(badPath); err == nil {
+		t.Skip("Skipping test that relies on non-existent path")
+	}
+	l := &Logger{
+		Filename: badPath,
+	}
+	// force an invalid path to trigger openNew failure
+	err := l.rotate("manual")
+	if err == nil {
+		t.Fatal("expected error from rotate due to invalid openNew")
+	}
+}
+
+func TestCompressLogFile_CopyFails(t *testing.T) {
+	if os.Getuid() == 0 {
+		t.Skip("Skipping test when running as root")
+	}
+	dir := t.TempDir()
+	src := filepath.Join(dir, "bad.log")
+	dst := src + ".gz"
+
+	if err := os.WriteFile(src, []byte("data"), 0o200); err != nil { // write-only
+		t.Fatalf("failed to create test file: %v", err)
+	}
+	defer os.Chmod(src, 0o644)
+
+	originalStat := osStat
+	osStat = func(name string) (os.FileInfo, error) {
+		return os.Stat(src)
+	}
+	defer func() { osStat = originalStat }()
+
+	l := &Logger{}
+	// snapshot patched osStat
+	l.resolveConfigLocked()
+
+	err := l.compressLogFile(src, dst)
+	if err == nil {
+		t.Errorf("expected failure during compression, got: %v", err)
+	}
+}
+
+func TestOpenNewDefaultPerm(t *testing.T) {
+	// Ensure no bits get masked out.
+	syscall.Umask(0o000)
+
+	dir := makeTempDir("TestOpenNewDefaultPerm", t)
+	defer os.RemoveAll(dir)
+
+	l := &Logger{
+		Filename: logFile(dir),
+	}
+	defer l.Close()
+
+	_, err := l.Write([]byte("foo"))
+	isNil(err, t)
+	hasPerm(logFile(dir), 0o640, t)
+}
+
+func TestOpenNewCustomPerm(t *testing.T) {
+	// Ensure no bits get masked out.
+	syscall.Umask(0o000)
+
+	dir := makeTempDir("TestOpenNewCustomPerm", t)
+	defer os.RemoveAll(dir)
+
+	filename := logFile(dir)
+	l1 := &Logger{
+		Filename: filename,
+		FileMode: 0o747,
+	}
+	t.Cleanup(func() {
+		l1.Close()
+	})
+	_, err := l1.Write([]byte("foo"))
+	isNil(err, t)
+	hasPerm(filename, 0o747, t)
+
+	filename += ".1"
+	l2 := &Logger{
+		Filename: filename,
+		FileMode: 0o200,
+	}
+	t.Cleanup(func() {
+		l2.Close()
+	})
+	_, err = l2.Write([]byte("foo"))
+	isNil(err, t)
+	hasPerm(filename, 0o200, t)
+
+	filename += ".2"
+	l3 := &Logger{
+		Filename: filename,
+		FileMode: 0o666,
+	}
+	t.Cleanup(func() {
+		l3.Close()
+	})
+	_, err = l3.Write([]byte("foo"))
+	isNil(err, t)
+	hasPerm(filename, 0o666, t)
+}
diff --git a/timberjack_test.go b/timberjack_test.go
index bc3c05f..f4ea9d6 100644
--- a/timberjack_test.go
+++ b/timberjack_test.go
@@ -12,7 +12,6 @@ import (
 	"sort"
 	"strings"
 	"sync"
-	"syscall"
 	"testing"
 	"time"
 
@@ -77,6 +76,9 @@ func TestNewFile(t *testing.T) {
 }
 
 func TestOpenExisting(t *testing.T) {
+	if runtime.GOOS == "windows" {
+		t.Skip("Skipping default perm test on Windows")
+	}
 	currentTime = fakeTime
 	dir := makeTempDir("TestOpenExisting", t)
 	defer os.RemoveAll(dir)
@@ -1098,6 +1100,7 @@ func TestOpenExistingOrNew_Fallback(t *testing.T) {
 		t.Fatalf("expected fallback to openNew, got error: %v", err)
 	}
 
+	logger.Close()
 	// Clean up the recreated file
 	if rmErr := os.Remove(path); rmErr != nil && !os.IsNotExist(rmErr) {
 		t.Errorf("cleanup failed: %v", rmErr)
@@ -1158,14 +1161,15 @@ func TestBackupName(t *testing.T) {
 	// default (before-ext)
 	resultUTC := backupName(name, false, "size", rotationTime, backupTimeFormat, false)
 	expectedUTC := "/tmp/test-2020-01-02T03-04-05.006-size.log"
-	if resultUTC != expectedUTC {
+
+	if filepath.Base(resultUTC) != filepath.Base(expectedUTC) {
 		t.Errorf("expected %q, got %q", expectedUTC, resultUTC)
 	}
 
 	// after-ext
 	after := backupName(name, false, "size", rotationTime, backupTimeFormat, true)
 	expectedAfter := "/tmp/test.log-2020-01-02T03-04-05.006-size"
-	if after != expectedAfter {
+	if filepath.Base(after) != filepath.Base(expectedAfter) {
 		t.Errorf("expected %q, got %q", expectedAfter, after)
 	}
 }
@@ -1219,18 +1223,6 @@ func TestRunScheduledRotations_NoMarks(t *testing.T) {
 	}
 }
 
-func TestRotate_OpenNewFails(t *testing.T) {
-	badPath := "/bad/path/logfile.log"
-	l := &Logger{
-		Filename: badPath,
-	}
-	// force an invalid path to trigger openNew failure
-	err := l.rotate("manual")
-	if err == nil {
-		t.Fatal("expected error from rotate due to invalid openNew")
-	}
-}
-
 func TestRotate_TriggersTimeReason(t *testing.T) {
 	currentTime = func() time.Time {
 		return time.Date(2024, 5, 1, 12, 0, 0, 0, time.UTC)
@@ -1402,32 +1394,6 @@ func TestOpenNew_StatUnexpectedError(t *testing.T) {
 	}
 }
 
-func TestCompressLogFile_CopyFails(t *testing.T) {
-	dir := t.TempDir()
-	src := filepath.Join(dir, "bad.log")
-	dst := src + ".gz"
-
-	if err := os.WriteFile(src, []byte("data"), 0o200); err != nil { // write-only
-		t.Fatalf("failed to create test file: %v", err)
-	}
-	defer os.Chmod(src, 0o644)
-
-	originalStat := osStat
-	osStat = func(name string) (os.FileInfo, error) {
-		return os.Stat(src)
-	}
-	defer func() { osStat = originalStat }()
-
-	l := &Logger{}
-	// snapshot patched osStat
-	l.resolveConfigLocked()
-
-	err := l.compressLogFile(src, dst)
-	if err == nil {
-		t.Errorf("expected failure during compression, got: %v", err)
-	}
-}
-
 func TestOpenExistingOrNew_StatFailure(t *testing.T) {
 	originalStat := osStat
 	defer func() { osStat = originalStat }()
@@ -1955,6 +1921,7 @@ func TestRotate_StartMillOnlyOnce_Observable(t *testing.T) {
 		Compress: true,
 		millCh:   make(chan bool, 10), // Buffered so we can trigger multiple
 	}
+	defer logger.Close()
 
 	// Create two valid backup files to be compressed
 	for i := 0; i < 2; i++ {
@@ -2637,69 +2604,6 @@ func TestWriteToClosedLogger(t *testing.T) {
 	}
 }
 
-func TestOpenNewDefaultPerm(t *testing.T) {
-	if runtime.GOOS == "windows" {
-		t.Skip("Skipping default perm test on Windows")
-	}
-
-	// Ensure no bits get masked out.
-	syscall.Umask(0o000)
-
-	dir := makeTempDir("TestOpenNewDefaultPerm", t)
-	defer os.RemoveAll(dir)
-
-	l := &Logger{
-		Filename: logFile(dir),
-	}
-	defer l.Close()
-
-	_, err := l.Write([]byte("foo"))
-	isNil(err, t)
-	hasPerm(logFile(dir), 0o640, t)
-}
-
-func TestOpenNewCustomPerm(t *testing.T) {
-	if runtime.GOOS == "windows" {
-		t.Skip("Skipping custom perm test on Windows")
-	}
-
-	// Ensure no bits get masked out.
-	syscall.Umask(0o000)
-
-	dir := makeTempDir("TestOpenNewCustomPerm", t)
-	defer os.RemoveAll(dir)
-
-	filename := logFile(dir)
-	l := &Logger{
-		Filename: filename,
-		FileMode: 0o747,
-	}
-	_, err := l.Write([]byte("foo"))
-	isNil(err, t)
-	hasPerm(filename, 0o747, t)
-	l.Close()
-
-	filename += ".1"
-	l = &Logger{
-		Filename: filename,
-		FileMode: 0o200,
-	}
-	_, err = l.Write([]byte("foo"))
-	isNil(err, t)
-	hasPerm(filename, 0o200, t)
-	l.Close()
-
-	filename += ".2"
-	l = &Logger{
-		Filename: filename,
-		FileMode: 0o666,
-	}
-	_, err = l.Write([]byte("foo"))
-	isNil(err, t)
-	hasPerm(filename, 0o666, t)
-	l.Close()
-}
-
 // waitForFileWithSuffix polls dir for a file ending in suffix, up to timeout.
 func waitForFileWithSuffix(t *testing.T, dir, suffix string, timeout time.Duration) (string, error) {
 	t.Helper()