Add drag-and-drop regression test and build targets

Makefile

@@ -2,7 +2,32 @@ JUCE_REPO    := https://github.com/juce-framework/JUCE.git
 JUCE_DIR     := lib/JUCE
 JUCE_TAG     := 8.0.9
 BUILD_DIR    := build
-CMAKE_ARGS   := -DCMAKE_BUILD_TYPE=Release
+TEST_BUILD_DIR := build-tests
+BUILD_TYPE   := Release
+CMAKE_ARGS   := -DCMAKE_BUILD_TYPE=$(BUILD_TYPE)
+UNAME_S      := $(shell uname -s)
+
+# Platform-aware CPU count
+ifeq ($(UNAME_S),Darwin)
+  JOBS := $(shell sysctl -n hw.ncpu 2>/dev/null || nproc 2>/dev/null || echo 4)
+else
+  JOBS := $(shell nproc 2>/dev/null || getconf _NPROCESSORS_ONLN 2>/dev/null || echo 4)
+endif
+
+ARTEFACTS := $(BUILD_DIR)/Monoslicer_artefacts/$(BUILD_TYPE)
+VST3       := $(ARTEFACTS)/VST3/Monoslicer.vst3
+
+# AU only exists on macOS; Standalone is a .app on macOS, a plain binary elsewhere
+ifeq ($(UNAME_S),Darwin)
+  AU        := $(ARTEFACTS)/AU/Monoslicer.component
+  AU_DIR    := ~/Library/Audio/Plug-Ins/Components
+  VST3_DIR  := ~/Library/Audio/Plug-Ins/VST3
+  FORMATS   := AU and VST3
+else
+  AU        :=
+  VST3_DIR  := ~/.vst3
+  FORMATS   := VST3
+endif
 
 C_RESET  := \033[0m
 C_BOLD   := \033[1m
@@ -25,9 +50,9 @@ COLORIZE = sed -E "$$(printf ' \
   s/(.*error:.*)$$/\033[1m\\1\033[0m/i \
 ')"
 
-.PHONY: all clean fetch configure build install
+.PHONY: all clean fetch configure build install test
 
-all: install
+all: build
 
 $(JUCE_DIR)/CMakeLists.txt:
 	$(call STEP,Fetching JUCE $(JUCE_TAG))
@@ -38,28 +63,42 @@ fetch: $(JUCE_DIR)/CMakeLists.txt
 
 configure: fetch
 	$(call STEP,Configuring CMake)
-	$(call INFO,$(C_DIM)cmake -B build -S . -DCMAKE_BUILD_TYPE=Release$(C_RESET))
+	$(call INFO,$(C_DIM)cmake -B $(BUILD_DIR) -S . $(CMAKE_ARGS)$(C_RESET))
 	cmake -B $(BUILD_DIR) -S . $(CMAKE_ARGS) | $(COLORIZE)
 
 build: configure
 	$(call STEP,Building Monoslicer)
-	$(call INFO,$(C_DIM)$(C_YELLOW)$(shell getconf _NPROCESSORS_ONLN)$(C_RESET)$(C_DIM) parallel jobs$(C_RESET))
-	cmake --build $(BUILD_DIR) -j$(shell getconf _NPROCESSORS_ONLN) | $(COLORIZE)
+	$(call INFO,$(C_DIM)$(C_YELLOW)$(JOBS)$(C_RESET)$(C_DIM) parallel jobs$(C_RESET))
+	cmake --build $(BUILD_DIR) -j$(JOBS) | $(COLORIZE)
 
 install: build
 	$(call STEP,Installing plugins)
-	$(call INFO,$(C_DIM)AU → ~/Library/Audio/Plug-Ins/Components$(C_RESET))
-	mkdir -p ~/Library/Audio/Plug-Ins/Components
-	cp -R $(BUILD_DIR)/Monoslicer_artefacts/Release/AU/Monoslicer.component ~/Library/Audio/Plug-Ins/Components/
-	$(call INFO,$(C_DIM)VST3 → ~/Library/Audio/Plug-Ins/VST3$(C_RESET))
-	mkdir -p ~/Library/Audio/Plug-Ins/VST3
-	cp -R $(BUILD_DIR)/Monoslicer_artefacts/Release/VST3/Monoslicer.vst3 ~/Library/Audio/Plug-Ins/VST3/
+ifeq ($(UNAME_S),Darwin)
+	$(call INFO,AU → $(AU_DIR))
+	mkdir -p $(AU_DIR)
+	cp -R $(AU) $(AU_DIR)/
+	$(call INFO,VST3 → $(VST3_DIR))
+	mkdir -p $(VST3_DIR)
+	cp -R $(VST3) $(VST3_DIR)/
 	$(call STEP,Rescanning Audio Units)
 	killall -9 AudioComponentRegistrar 2>/dev/null; true
-	@printf '\n  $(C_GREEN)$(C_BOLD)✓ Done.$(C_RESET) $(C_GREEN)Monoslicer$(C_RESET)$(C_DIM) installed as AU and VST3$(C_RESET)\n\n'
+else
+	$(call INFO,VST3 → $(VST3_DIR))
+	mkdir -p $(VST3_DIR)
+	cp -R $(VST3) $(VST3_DIR)/
+endif
+	@printf '\n  $(C_GREEN)$(C_BOLD)✓ Done.$(C_RESET) $(C_GREEN)Monoslicer$(C_RESET)$(C_DIM) installed as $(FORMATS)$(C_RESET)\n\n'
 
 clean:
 	$(call STEP,Cleaning)
-	rm -rf $(BUILD_DIR)
-	$(call INFO,$(C_DIM)removed $(BUILD_DIR)/$(C_RESET))
+	rm -rf $(BUILD_DIR) $(TEST_BUILD_DIR)
+	$(call INFO,$(C_DIM)removed $(BUILD_DIR)/ and $(TEST_BUILD_DIR)/$(C_RESET))
 	@printf '  $(C_GREEN)$(C_BOLD)✓ Clean.$(C_RESET)\n'
+
+# Tests live in their own build dir so `make` stays fast.
+test:
+	$(call STEP,Building and running tests)
+	$(call INFO,$(C_DIM)separate build dir → $(TEST_BUILD_DIR)$(C_RESET))
+	cmake -B $(TEST_BUILD_DIR) -S . $(CMAKE_ARGS) -DMONOSLICER_BUILD_TESTS=ON > /dev/null
+	cmake --build $(TEST_BUILD_DIR) -j$(JOBS) --target MonoslicerDnDTest > /dev/null
+	$(TEST_BUILD_DIR)/MonoslicerDnDTest_artefacts/$(BUILD_TYPE)/MonoslicerDnDTest