Add drag-and-drop regression test and build targets

CMakeLists.txt

@@ -90,6 +90,42 @@ target_link_libraries(Monoslicer
         juce::juce_recommended_lto_flags
 )
 
+# Drag and drop regression test. Off by default: a console app needs its own copy
+# of the JUCE modules, so building it by default would roughly double build time.
+# Enable with -DMONOSLICER_BUILD_TESTS=ON, or just use `make test`.
+option(MONOSLICER_BUILD_TESTS "Build the test executables" OFF)
+
+if(MONOSLICER_BUILD_TESTS)
+  juce_add_console_app(MonoslicerDnDTest
+      PRODUCT_NAME "MonoslicerDnDTest"
+  )
+  target_sources(MonoslicerDnDTest PRIVATE
+      Tests/DragAndDropTest.cpp
+      Source/PluginProcessor.cpp
+      Source/PluginEditor.cpp
+      Source/SliceManager.cpp
+      Source/WaveformDisplay.cpp
+      Source/PianoRollDisplay.cpp
+  )
+  target_compile_definitions(MonoslicerDnDTest PUBLIC
+      JUCE_WEB_BROWSER=0
+      JUCE_USE_CURL=0
+      JUCE_VST3_CAN_REPLACE_VST2=0
+      JucePlugin_Name="Monoslicer"
+      GIT_VERSION="${GIT_VERSION}"
+      # handleDragDrop() defers filesDropped() via MessageManager::callAsync, so the
+      # test needs to be able to pump the message loop to observe it.
+      JUCE_MODAL_LOOPS_PERMITTED=1
+  )
+  target_link_libraries(MonoslicerDnDTest
+      PRIVATE
+          juce::juce_audio_utils
+          juce::juce_audio_processors
+          juce::juce_audio_formats
+          juce::juce_dsp
+  )
+endif()
+
 # Suppress JUCE / VST3 SDK warnings globally for all targets.
 if (CMAKE_CXX_COMPILER_ID MATCHES "Clang")
   set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fcolor-diagnostics")