testing/tcl_commands: test target create, cget, configure

Introduce basic testing of error-handling in target configuration
related commands.

The tests can be run via `make check` when JTAG `dummy` adapter is
enabled.

Change-Id: Id0f382046dd70007d8e696d82d2396a7ccab7a33
Signed-off-by: Evgeniy Naydanov <evgeniy.naydanov@syntacore.com>
Reviewed-on: https://review.openocd.org/c/openocd/+/8644
Tested-by: jenkins
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>

testing/tcl_commands/test-target-create-command.cfg

@@ -0,0 +1,54 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
+
+namespace import testing_helpers::*
+namespace import configure_testing::*
+
+adapter driver dummy
+jtag newtap tap cpu -irlen 5
+
+check_syntax_err {target create}
+check_syntax_err {target create}
+check_syntax_err {target create test.target}
+check_error_matches -chain-position {target create test.target testee}
+
+{*}[target_create_first_args] {*}[simple_configure_options]
+
+foreach {opt arg} [simple_configure_options] {
+	check_error_matches ".*${opt}.*" {{*}[target_create_first_args] $opt}
+}
+
+foreach {opt1 arg1} [simple_configure_options] {
+	foreach {opt2 arg2} [simple_configure_options] {
+		check_error_matches ".*${opt2}.*" \
+			{{*}[target_create_first_args] $opt1 $arg1 $opt2}
+		check_error_matches {} \
+			{{*}[target_create_first_args] $opt1 $opt2 $arg2}
+	}
+}
+
+check_error_matches ".*-type.*" \
+	{{*}[target_create_first_args] -type}
+
+check_error_matches ".*-type.*" \
+	{{*}[target_create_first_args] {*}[simple_configure_options] -type}
+
+check_error_matches {.*-event [^ ]+ .*} \
+	{{*}[target_create_first_args] -event}
+
+check_error_matches {.*not-an-event.*} \
+	{{*}[target_create_first_args] -event not-an-event}
+
+check_error_matches {.*-event examine-start [^ ]+.*} \
+	{{*}[target_create_first_args] -event examine-start}
+
+{*}[target_create_first_args] {*}[simple_configure_options] \
+	-event examine-start body
+{*}[target_create_first_args] {*}[simple_configure_options] \
+	-event examine-start body \
+	-event examine-end another-body \
+	-event examine-start new-body
+{*}[target_create_first_args] -event examine-start body {*}[simple_configure_options]
+
+{*}[target_create_first_args] {*}[simple_configure_options] -defer-examine
+
+shutdown