diff --git a/test/back_ground.c b/test/back_ground.c
new file mode 100644
index 0000000..c53c2a3
--- /dev/null
+++ b/test/back_ground.c
@@ -0,0 +1,308 @@
+/****************************************************************************
+ * Copyright 2021,2022 Thomas E. Dickey                                     *
+ *                                                                          *
+ * Permission is hereby granted, free of charge, to any person obtaining a  *
+ * copy of this software and associated documentation files (the            *
+ * "Software"), to deal in the Software without restriction, including      *
+ * without limitation the rights to use, copy, modify, merge, publish,      *
+ * distribute, distribute with modifications, sublicense, and/or sell       *
+ * copies of the Software, and to permit persons to whom the Software is    *
+ * furnished to do so, subject to the following conditions:                 *
+ *                                                                          *
+ * The above copyright notice and this permission notice shall be included  *
+ * in all copies or substantial portions of the Software.                   *
+ *                                                                          *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *
+ * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    *
+ * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
+ *                                                                          *
+ * Except as contained in this notice, the name(s) of the above copyright   *
+ * holders shall not be used in advertising or otherwise to promote the     *
+ * sale, use or other dealings in this Software without prior written       *
+ * authorization.                                                           *
+ ****************************************************************************/
+/*
+ * $Id: back_ground.c,v 1.9 2022/12/10 22:28:50 tom Exp $
+ */
+
+#include <test.priv.h>
+
+#if USE_WIDEC_SUPPORT
+
+#define NEED_COLOR_CODE 1
+#define NEED_COLOR_NAME 1
+#include <color_name.h>
+#include <dump_window.h>
+
+static int default_bg = COLOR_BLACK;
+static int default_fg = COLOR_WHITE;
+static wchar_t wide_fill = L' ';
+
+static wchar_t
+decode_wchar(const char *value)
+{
+    long result;
+    char *next = NULL;
+    int radix = 0;
+
+    if (!strncmp(value, "U+", 2)) {
+	value += 2;
+	radix = 16;
+    }
+    result = strtol(value, &next, radix);
+    if (next == value || (next == NULL || *next != '\0')) {
+	fprintf(stderr, "decoding wchar_t: %s\n", value);
+	exit(EXIT_FAILURE);
+    }
+    return (wchar_t) result;
+}
+
+static void
+test_background(void)
+{
+    NCURSES_COLOR_T f, b;
+    int row;
+    int chr;
+    wchar_t blank[2];
+    wchar_t graphics[2];
+    cchar_t data;
+
+    if (pair_content(0, &f, &b) == ERR) {
+	printw("pair 0 contains no data\n");
+    } else {
+	printw("pair 0 contains (%d,%d)\n", (int) f, (int) b);
+    }
+    dump_window(stdscr);
+
+    blank[0] = wide_fill;
+    blank[1] = L'\0';
+
+    printw("Initializing pair 1 to red/%s\n", color_name(default_bg));
+    init_pair(1, COLOR_RED, (NCURSES_COLOR_T) default_bg);
+    setcchar(&data, blank, A_NORMAL, 1, NULL);
+    bkgrndset(&data);
+    printw("RED/BLACK\n");
+    dump_window(stdscr);
+
+    printw("Initializing pair 2 to %s/blue\n", color_name(default_fg));
+    init_pair(2, (NCURSES_COLOR_T) default_fg, COLOR_BLUE);
+    setcchar(&data, blank, A_NORMAL, 2, NULL);
+    bkgrndset(&data);
+    printw("This line should be %s/blue\n", color_name(default_fg));
+    dump_window(stdscr);
+
+    printw("Initializing pair 3 to %s/cyan (ACS_HLINE)\n", color_name(default_fg));
+    init_pair(3, (NCURSES_COLOR_T) default_fg, COLOR_CYAN);
+    printw("...and drawing a box which should be followed by lines\n");
+    graphics[0] = ACS_HLINE & A_CHARTEXT;
+    graphics[1] = L'\0';
+    setcchar(&data, graphics, A_ALTCHARSET, 3, NULL);
+    bkgrndset(&data);
+    /*
+     * Characters from vt100 line-drawing should be mapped to line-drawing,
+     * since A_ALTCHARSET is set in the background, and the character part
+     * of the background is replaced by the nonblank characters written.
+     *
+     * Characters not in the line-drawing range are usually sent as-is.
+     *
+     * With SVr4 curses it is possible to rely on this to mix uppercase text
+     * with the (lowercase) line-drawing characters.  ncurses uses some of
+     * the uppercase characters for encoding thick- and double-lines.
+     */
+    row = 7;
+    mvprintw(row++, 10, "l");
+    for (chr = 0; chr < 32; ++chr)
+	AddCh(' ');
+    printw("x\n");
+    chr = 32;
+    while (chr < 128) {
+	if ((chr % 32) == 0)
+	    mvprintw(row++, 10, "x");
+	AddCh((chr == 127) ? ' ' : chr);
+	if ((++chr % 32) == 0)
+	    printw("x\n");
+    }
+    mvprintw(row++, 10, "m");
+    for (chr = 0; chr < 32; ++chr)
+	AddCh(' ');
+    printw("j\n");
+    dump_window(stdscr);
+
+    setcchar(&data, blank, A_NORMAL, 0, NULL);
+    bkgrndset(&data);
+    printw("Default Colors\n");
+    dump_window(stdscr);
+
+    printw("Resetting colors to pair 1\n");
+    setcchar(&data, blank, A_NORMAL, 1, NULL);
+    bkgrndset(&data);
+    printw("This line should be red/%s\n", color_name(default_bg));
+    dump_window(stdscr);
+
+    printw("Setting screen to pair 0\n");
+    setcchar(&data, blank, A_NORMAL, 0, NULL);
+    bkgrndset(&data);
+    dump_window(stdscr);
+
+    printw("Setting screen to pair 1\n");
+    setcchar(&data, blank, A_NORMAL, 1, NULL);
+    bkgrndset(&data);
+    dump_window(stdscr);
+
+    printw("Setting screen to pair 2\n");
+    setcchar(&data, blank, A_NORMAL, 2, NULL);
+    bkgrndset(&data);
+    dump_window(stdscr);
+
+    printw("Setting screen to pair 3\n");
+    setcchar(&data, blank, A_NORMAL, 3, NULL);
+    bkgrndset(&data);
+    dump_window(stdscr);
+
+    printw("Setting screen to pair 0\n");
+    setcchar(&data, blank, A_NORMAL, 0, NULL);
+    bkgrndset(&data);
+    dump_window(stdscr);
+}
+
+static void
+usage(int ok)
+{
+    static const char *msg[] =
+    {
+	"Usage: background [options]"
+	,""
+	,USAGE_COMMON
+	,"Options:"
+#if HAVE_ASSUME_DEFAULT_COLORS
+	," -a       invoke assume_default_colors, repeat to use in init_pair"
+#endif
+	," -b XXX   specify background color"
+#if HAVE_USE_DEFAULT_COLORS
+	," -d       invoke use_default_colors, repeat to use in init_pair"
+#endif
+	," -f XXX   specify foreground color"
+	," -l FILE  log window-dumps to this file"
+	," -w       fill background with stipple pattern"
+	," -W CODE  fill background with this Unicode value"
+    };
+    size_t n;
+
+    for (n = 0; n < SIZEOF(msg); n++)
+	fprintf(stderr, "%s\n", msg[n]);
+
+    ExitProgram(ok ? EXIT_SUCCESS : EXIT_FAILURE);
+}
+/* *INDENT-OFF* */
+VERSION_COMMON()
+/* *INDENT-ON* */
+
+int
+main(int argc, char *argv[])
+{
+#if HAVE_ASSUME_DEFAULT_COLORS
+    int a_option = 0;
+#endif
+#if HAVE_USE_DEFAULT_COLORS
+    int d_option = 0;
+#endif
+    int ch;
+
+    setlocale(LC_ALL, "");
+
+    while ((ch = getopt(argc, argv, OPTS_COMMON "ab:df:l:wW:")) != -1) {
+	switch (ch) {
+#if HAVE_ASSUME_DEFAULT_COLORS
+	case 'a':
+	    ++a_option;
+	    break;
+#endif
+	case 'b':
+	    default_bg = color_code(optarg);
+	    break;
+#if HAVE_USE_DEFAULT_COLORS
+	case 'd':
+	    ++d_option;
+	    break;
+#endif
+	case 'f':
+	    default_fg = color_code(optarg);
+	    break;
+	case 'l':
+	    if (!open_dump(optarg))
+		usage(FALSE);
+	    break;
+	case 'w':
+	    wide_fill = L'\u2591';
+	    break;
+	case 'W':
+	    wide_fill = decode_wchar(optarg);
+	    break;
+	case OPTS_VERSION:
+	    show_version(argv);
+	    ExitProgram(EXIT_SUCCESS);
+	default:
+	    usage(ch == OPTS_USAGE);
+	    /* NOTREACHED */
+	}
+    }
+#if HAVE_USE_DEFAULT_COLORS && HAVE_ASSUME_DEFAULT_COLORS
+    if (a_option && d_option) {
+	fprintf(stderr, "Use either -a or -d option, but not both\n");
+	ExitProgram(EXIT_FAILURE);
+    }
+#endif
+
+    initscr();
+    cbreak();
+    noecho();
+
+    if (has_colors()) {
+	start_color();
+
+#if HAVE_USE_DEFAULT_COLORS
+	if (d_option) {
+	    printw("Using default colors...\n");
+	    use_default_colors();
+	    if (d_option > 1) {
+		default_fg = -1;
+		default_bg = -1;
+	    }
+	}
+#endif
+#if HAVE_ASSUME_DEFAULT_COLORS
+	if (a_option) {
+	    printw("Using assumed colors %s/%s...\n",
+		   color_name(default_fg),
+		   color_name(default_bg));
+	    assume_default_colors(default_fg, default_bg);
+	    if (a_option > 1) {
+		default_fg = -1;
+		default_bg = -1;
+	    }
+	}
+#endif
+
+	test_background();
+
+    } else {
+	printw("This demo requires a color terminal");
+	getch();
+    }
+    endwin();
+    close_dump();
+    ExitProgram(EXIT_SUCCESS);
+}
+
+#else
+int
+main(void)
+{
+    printf("This program requires the wide-curses library\n");
+    ExitProgram(EXIT_FAILURE);
+}
+#endif /* USE_WIDEC_SUPPORT */