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diff --git a/gdb/testsuite/gdb.base/show-user-completion.exp b/gdb/testsuite/gdb.base/show-user-completion.exp
new file mode 100644
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+++ b/gdb/testsuite/gdb.base/show-user-completion.exp
@@ -0,0 +1,72 @@
+# Copyright 2021 Free Software Foundation, Inc.
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+# Test tab-completion for the 'show user' command.
+
+load_lib completion-support.exp
+
+# This test does not require any file to be loaded.
+clean_restart
+
+# Define the 'foo' and 'bar' commands so we have something to complete.
+set re [multi_line "Type commands for definition of \"foo\"." \
+		   "End with a line saying just \"end\"." \
+		   ">$" ]
+gdb_test_multiple "define foo" "define user command: foo" {
+    -re $re {
+	gdb_test "print \"foo\"\nend" "" $gdb_test_name
+    }
+}
+
+set re [multi_line "Type commands for definition of \"bar\"." \
+		   "End with a line saying just \"end\"." \
+		   ">$"]
+gdb_test_multiple "define bar" "define user command: bar" {
+    -re  $re {
+	gdb_test "print \"bar\"\nend" "" $gdb_test_name
+    }
+}
+
+# The completer should show both options.
+test_gdb_complete_multiple "show user " "" "" "bar foo"
+
+# If we give the beginning of one of the commands, it should complete it.
+test_gdb_complete_unique "show user f" "show user foo"
+test_gdb_complete_unique "show user b" "show user bar"
+
+# Define a user prefix.
+gdb_test "define-prefix mygroup"
+
+# Add a user defined command in the user defined prefix.
+set re [multi_line  "Type commands for definition of \"mygroup mycommand\"." \
+		    "End with a line saying just \"end\"." \
+		    ">$"]
+set test_name "define user command: mygroup mycommand"
+gdb_test_multiple "define mygroup mycommand" $test_name {
+    -re  $re {
+	gdb_test "print \"42\"\nend" "" $gdb_test_name
+    }
+}
+
+with_test_prefix "with user-prefix" {
+    # We now expect the completion to yield only 3 results.  As the 'mycommand'
+    # is within the 'mygroup' prefix, it should not be reachable without
+    # traversing 'mygroup' first.
+    test_gdb_complete_multiple "show user " "" "" "bar foo mygroup"
+}
+
+# Check that we can complete commands defined under a prefix.
+test_gdb_complete_unique "show user m" "show user mygroup"
+test_gdb_complete_unique "show user mygroup " "show user mygroup mycommand"