WIP: Retreived the unit tests (formerly test cases)

Some of these still work, others have just been dummied out for now.

Also added tests for console colors tool, and tweaked it to work
properly.

tests/units/makefile

@@ -0,0 +1,86 @@
+#compiler settings
+CC=gcc
+CFLAGS+=-std=c17 -g -Wall -Werror -Wextra -Wpedantic -Wformat=2 -Wno-newline-eof
+LIBS+=-lm
+LDFLAGS+=
+
+ifeq ($(shell uname),Linux)
+LDFLAGS=-Wl,--gc-sections
+else ifeq ($(shell uname),NetBSD)
+LDFLAGS=-Wl,--gc-sections
+else ifeq ($(OS),Windows_NT)
+LDFLAGS=-Wl,--gc-sections
+else ifeq ($(shell uname),Darwin)
+LDFLAGS=-Wl,-dead_strip
+else
+	@echo "LDFLAGS set failed - what platform is this?"
+endif
+
+#directories
+TEST_ROOTDIR=../..
+TEST_SOURCEDIR=$(TEST_ROOTDIR)/$(TOY_SOURCEDIR)
+TEST_CASESDIR=.
+
+TEST_OUTDIR=out
+TEST_OBJDIR=obj
+
+#file names
+TEST_SOURCEFILES=$(wildcard $(TEST_SOURCEDIR)/*.c)
+TEST_CASESFILES=$(wildcard $(TEST_CASESDIR)/test_*.c)
+
+#build the object files, compile the test cases, and run
+all: build-source build-cases build-link build-run
+
+#targets for each step
+.PHONY: build-source
+build-source: $(TEST_OUTDIR) $(TEST_OBJDIR) $(addprefix $(TEST_OBJDIR)/,$(notdir $(TEST_SOURCEFILES:.c=.o)))
+
+.PHONY: build-cases
+build-cases: $(TEST_OUTDIR) $(TEST_OBJDIR) $(addprefix $(TEST_OBJDIR)/,$(notdir $(TEST_CASESFILES:.c=.o)))
+
+.PHONY: build-link
+build-link: $(TEST_OUTDIR) $(TEST_OBJDIR) $(addprefix $(TEST_OUTDIR)/,$(notdir $(TEST_CASESFILES:%.c=%.exe)))
+
+.PHONY: build-run
+build-run: $(addprefix $(TEST_OUTDIR)/,$(notdir $(TEST_CASESFILES:%.c=%.exe))) $(addprefix $(TEST_OUTDIR)/,$(notdir $(TEST_CASESFILES:%.c=%.run)))
+
+#util targets
+$(TEST_OUTDIR):
+	mkdir $(TEST_OUTDIR)
+
+$(TEST_OBJDIR):
+	mkdir $(TEST_OBJDIR)
+
+#compilation steps
+$(TEST_OBJDIR)/%.o: $(TEST_SOURCEDIR)/%.c
+	$(CC) -c -o $@ $< $(addprefix -I,$(TEST_SOURCEDIR)) $(CFLAGS) -fdata-sections -ffunction-sections
+
+$(TEST_OBJDIR)/%.o: $(TEST_CASESDIR)/%.c
+	$(CC) -c -o $@ $< $(addprefix -I,$(TEST_SOURCEDIR) $(TEST_CASESDIR)) $(CFLAGS) -fdata-sections -ffunction-sections
+
+$(TEST_OUTDIR)/%.exe: $(TEST_OBJDIR)/%.o
+	@$(CC) -o $@ $< $(addprefix $(TEST_OBJDIR)/,$(notdir $(TEST_SOURCEFILES:.c=.o))) $(CFLAGS) $(LIBS) $(LDFLAGS)
+
+.PRECIOUS: $(TEST_OUTDIR)/%.run
+$(TEST_OUTDIR)/%.run: $(TEST_OUTDIR)/%.exe
+	$<
+
+#debugging targets
+gdb: build-source build-cases build-link build-run-gdb
+
+.PHONY: build-run-gdb
+build-run-gdb: $(addprefix $(TEST_OUTDIR)/,$(notdir $(TEST_CASESFILES:%.c=%.exe))) $(addprefix $(TEST_OUTDIR)/,$(notdir $(TEST_CASESFILES:%.c=%.run-gdb)))
+
+.PRECIOUS: $(TEST_OUTDIR)/%.run-gdb
+$(TEST_OUTDIR)/%.run-gdb: $(TEST_OUTDIR)/%.exe
+	gdb $< -ix gdb_init -ex=run --batch --return-child-result --args "$<"
+
+#valgrind targets
+valgrind: build-source build-cases build-link build-run-valgrind
+
+.PHONY: build-run-valgrind
+build-run-valgrind: $(addprefix $(TEST_OUTDIR)/,$(notdir $(TEST_CASESFILES:%.c=%.exe))) $(addprefix $(TEST_OUTDIR)/,$(notdir $(TEST_CASESFILES:%.c=%.run-valgrind)))
+
+.PRECIOUS: $(TEST_OUTDIR)/%.run-valgrind
+$(TEST_OUTDIR)/%.run-valgrind: $(TEST_OUTDIR)/%.exe
+	valgrind --leak-check=full --show-leak-kinds=all --track-origins=yes $<