Use formula helper in tests
texinfo: modernize

Closes #35323.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
texinfo: add test

Closes #35323.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
jansson: add test

Closes #35324.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
gnu-prolog: add test

Closes #35325.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
libevent: add test

Closes #35326.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>