add test infrastructure

backend/Makefile

@@ -28,41 +28,33 @@ else
 	endif
 endif
 
-NO_MAIN = 0
-ifeq ($(NO_MAIN),1)
-	CXXFLAGS += -Dmain="not_main"
-endif
-
 build_dir = build
 obj_dir = $(build_dir)/obj
+src_dir = src
+test_dir = tests
 
-sources = \
-	src/main.cpp \
-	src/tcp.cpp \
-	src/http.cpp
+sources = $(shell find $(src_dir) -name '*.cpp' -and -not -name 'main.cpp')
+sources_with_main=$(sources) src/main.cpp
 
-tests = \
-	tests/true.cpp
+tests = $(shell find $(test_dir) -name '*.cpp')
 
 target=$(build_dir)/backend
 
 all: $(target)
 
-$(target): $(sources:%.cpp=$(obj_dir)/%.o)
+$(target): $(sources_with_main:%.cpp=$(obj_dir)/%.o)
 	$(LD) -o $@ $(CXXFLAGS) $(LDFLAGS) $^
 
-$(obj_dir)/%.o: %.cpp
+$(obj_dir)/%.o:%.cpp
 	@mkdir -p $(dir $@)
 	$(CXX) $< -c -o $@ -MMD -MP $(CXXFLAGS)
 
-test: $(sources:%.cpp=$(obj_dir)/%.o) run_tests
+test: $(tests:tests/%.cpp=$(build_dir)/tests/test_%)
+	printf "%s\n" $^ | xargs -I % sh -c 'echo "- %..." && ./% && echo "- %: OK" || (echo "- %: FAILED" && exit 1)'
 
-run_tests: $(tests:tests/%.cpp=$(build_dir)/tests/test_%)
-	printf "%s\n" $2 | xargs -I % sh -c 'echo "- %..." && ./% && echo "- %: OK" || echo "- %: FAILED" && exit 1'
-
-$(build_dir)/tests/test_%: tests/%.cpp
+$(build_dir)/tests/test_%: $(obj_dir)/tests/%.o $(sources:%.cpp=$(obj_dir)/%.o)
 	@mkdir -p $(dir $@)
-	$(CXX) $< -o $@ -MMD -MP $(CXXFLAGS)
+	$(LD) -o $@ $(CXXFLAGS) $(LDFLAGS) $^
 
 format:
 	$(CLANG_FORMAT) -style=file -i src/*
@@ -73,5 +65,5 @@ check:
 clean:
 	rm -rf $(build_dir)
 
--include $(sources:%.cpp=$(obj_dir)/%.d)
+-include $(sources_with_main:%.cpp=$(obj_dir)/%.d) $(tests:%.cpp=$(obj_dir)/%.d)
 

backend/tests/assertions.h

@@ -0,0 +1,18 @@
+#pragma once
+
+#include <cstdlib>
+#include <format>
+#include <iostream>
+
+#define ASSERT_EQ(EXPR, VALUE)                                                 \
+    do {                                                                       \
+        if ((EXPR) != (VALUE)) {                                               \
+            std::cerr << std::format(                                          \
+                "ASSERTION FAILED: Expected '{}' ({}) to be '{}' ({})\n",      \
+                #EXPR,                                                         \
+                (EXPR),                                                        \
+                #VALUE,                                                        \
+                (VALUE));                                                      \
+            std::exit(1);                                                      \
+        }                                                                      \
+    } while (false);

backend/tests/true.cpp

@@ -1,6 +1,7 @@
+#include "assertions.h"
 #include <cassert>
 
 int main()
 {
-    assert(true);
+    ASSERT_EQ(1 + 2, 3);
 }