adjust test error messages

Signed-off-by: leongross <leon.gross@9elements.com>

src/os/truncate_test.go

@@ -9,27 +9,32 @@ package os_test
 import (
 	. "os"
 	"path/filepath"
+	"runtime"
 	"testing"
 )
 
 func TestTruncate(t *testing.T) {
+	if runtime.GOOS == "windows" {
+		t.Skip()
+	}
+
 	tmpDir := t.TempDir()
-	file := filepath.Join(tmpDir, "truncate_0x100")
+	file := filepath.Join(tmpDir, "truncate_test")
 
 	fd, err := Create(file)
 	if err != nil {
-		t.Fatalf("create %q: %s", file, err)
+		t.Fatalf("create %q: got %v, want nil", file, err)
 	}
 
 	// truncate up to 0x100
 	if err := fd.Truncate(0x100); err != nil {
-		t.Fatalf("truncate %q: %s", file, err)
+		t.Fatalf("truncate %q: got %v, want nil", file, err)
 	}
 
 	// check if size is 0x100
 	fi, err := Stat(file)
 	if err != nil {
-		t.Fatalf("stat %q: %s", file, err)
+		t.Fatalf("stat %q: got %v, want nil", file, err)
 	}
 
 	if fi.Size() != 0x100 {
@@ -38,13 +43,13 @@ func TestTruncate(t *testing.T) {
 
 	// truncate down to 0x80
 	if err := fd.Truncate(0x80); err != nil {
-		t.Fatalf("truncate %q: %s", file, err)
+		t.Fatalf("truncate %q: got %v, want nil", file, err)
 	}
 
 	// check if size is 0x80
 	fi, err = Stat(file)
 	if err != nil {
-		t.Fatalf("stat %q: %s", file, err)
+		t.Fatalf("stat %q: got %v, want nil", file, err)
 	}
 
 	if fi.Size() != 0x80 {