do not put the test build tree into TEXINPUTS

tests/.gitignore

+/src
 /pdflatex
 /xelatex
 /lualatex

tests/Makefile

@@ -2,7 +2,7 @@ PDFLATEX		?= pdflatex
 XELATEX			?= xelatex
 LUALATEX		?= lualatex
 
-export TEXINPUTS	:= $(CURDIR)/..//:$(TEXINPUTS)
+export TEXINPUTS	:= $(CURDIR)/src//:$(TEXINPUTS)
 
 cmd%pdflatex		 = $(PDFLATEX)
 cmd%xelatex		 = $(XELATEX)
@@ -11,15 +11,15 @@ cmd%lualatex		 = $(LUALATEX)
 engines			 = pdflatex xelatex lualatex
 targets			 = minimal minimal_handout tutorial
 
-%/minimal:
+%/minimal: src
 	@mkdir -p $(@D)
 	cd $(@D) && $(cmd%$*) ../../minimal/minimal.tex
 
-%/minimal_handout:
+%/minimal_handout: src
 	@mkdir -p $(@D)
 	cd $(@D) && $(cmd%$*) ../../minimal/minimal_handout.tex
 
-%/tutorial:
+%/tutorial: src %/minimal %/minimal_handout
 	@mkdir -p $(@D)
 	cd $(@D) && $(cmd%$*) ../../tutorial/tutorial.tex
 
@@ -28,6 +28,10 @@ all: $(engines)
 
 $(foreach engine,$(engines),$(eval $(engine): $(patsubst %,$(engine)/%,$(targets))))
 
+src:
+	mkdir -p $@
+	cd $@ && ln -s ../../*.sty ../../*.pdf .
 
 clean:
+	$(RM) -r src
 	$(RM) -r $(engines)