Add TAP tests for client programs

Reviewed-by: Pavel Stěhule <pavel.stehule@gmail.com>
Reviewed-by: Erik Rijkers <er@xs4all.nl>

configure

@@ -627,6 +627,7 @@ ac_includes_default="\
 
 ac_subst_vars='LTLIBOBJS
 vpath_build
+PROVE
 OSX
 XSLTPROC
 COLLATEINDEX
@@ -14350,6 +14351,52 @@ fi
 done
 
 
+#
+# Check for test tools
+#
+for ac_prog in prove
+do
+  # Extract the first word of "$ac_prog", so it can be a program name with args.
+set dummy $ac_prog; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_prog_PROVE+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  if test -n "$PROVE"; then
+  ac_cv_prog_PROVE="$PROVE" # Let the user override the test.
+else
+as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_prog_PROVE="$ac_prog"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+fi
+fi
+PROVE=$ac_cv_prog_PROVE
+if test -n "$PROVE"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $PROVE" >&5
+$as_echo "$PROVE" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+  test -n "$PROVE" && break
+done
+
+
 # Thread testing
 
 # We have to run the thread test near the end so we have all our symbols