Fixed CI recipe, confirmed support for Catch < 2

.drone.yml

@@ -43,7 +43,7 @@ pipeline:
       - rm -rf build && mkdir -p build && cd build
       - cmake -DCMAKE_INSTALL_PREFIX=/usr -DWITH_TESTS=1 ..
       - make VERBOSE=1
-      - for test in test_*; do ${test}; done
+      - ctest ..
       - make install DESTDIR=install
       - make package
       - cmake -DWITH_DEB=ON ..

README.md

@@ -80,7 +80,7 @@ They are generated on Debian Stretch 64 bit and signed with my
 * [cmake](https://cmake.org/) (at least 3.2)
 * [imagemagick](https://www.imagemagick.org/) (tested: 7.0 / 6.7)
 * Optional:
-  * [Catch](https://github.com/catchorg/Catch2) (tested: 2.3.0)
+  * [Catch](https://github.com/catchorg/Catch2) (tested: 2.3 / 1.2)
 
 On a Debian system, install the packages:
 `build-essential cmake libmagick++-dev`.

tests.CMakeLists.txt

@@ -3,6 +3,7 @@ if(WITH_TESTS)
     if(Catch2_FOUND)
         set(MYCATCH, Catch2::Catch2)
     else()
+        message(WARNING "Catch2 not found. Assuming Catch 1.x is installed.")
         set(MYCATCH, "")
     endif()
     include(CTest)