Simplify pgconn tests by using T.TempDir

Author: alexandear

pgconn/pgconn_test.go

@@ -2103,8 +2103,9 @@ func TestConnCopyFromGzipReader(t *testing.T) {
 )`).ReadAll()
 require.NoError(t, err)
 
-f, err := os.CreateTemp("", "*")
+f, err := os.CreateTemp(t.TempDir(), "*")
 require.NoError(t, err)
+defer f.Close()
 
 gw := gzip.NewWriter(f)
 
@@ -2137,12 +2138,6 @@ func TestConnCopyFromGzipReader(t *testing.T) {
 err = gr.Close()
 require.NoError(t, err)
 
-err = f.Close()
-require.NoError(t, err)
-
-err = os.Remove(f.Name())
-require.NoError(t, err)
-
 result := pgConn.ExecParams(ctx, "select * from foo", nil, nil, nil, nil).Read()
 require.NoError(t, result.Err)