Adding do-nothing tests/fortran directory.

The `Makefile` depends on `test.f90` as the main program
that runs tests.

tests/fortran/Makefile

@@ -0,0 +1,49 @@
+CURR_DIR := $(shell dirname $(realpath $(lastword $(MAKEFILE_LIST))))
+SRC_DIR := $(realpath $(CURR_DIR)/../../src/bezier)
+QUADPACK_DIR := $(realpath $(SRC_DIR)/quadpack)
+
+FC = gfortran
+F77 = .f
+F90 = .f90
+OBJ = .o
+FCFLAGS = -fPIC -O3
+
+# NOTE: **Must** specify the order for source files.
+F77_SOURCES := \
+	$(QUADPACK_DIR)/d1mach$(F77) \
+	$(QUADPACK_DIR)/dqelg$(F77) \
+	$(QUADPACK_DIR)/dqpsrt$(F77) \
+	$(QUADPACK_DIR)/dqk21$(F77) \
+	$(QUADPACK_DIR)/dqagse$(F77)
+F90_SOURCES := \
+	$(SRC_DIR)/types$(F90) \
+	$(SRC_DIR)/helpers$(F90) \
+	$(SRC_DIR)/curve$(F90) \
+	$(SRC_DIR)/surface$(F90) \
+	$(SRC_DIR)/curve_intersection$(F90)
+F77_OBJS := $(patsubst $(QUADPACK_DIR)/%$(F77), $(QUADPACK_DIR)/%$(OBJ), $(F77_SOURCES))
+F90_OBJS := $(patsubst $(SRC_DIR)/%$(F90), $(SRC_DIR)/%$(OBJ), $(F90_SOURCES))
+
+test: $(CURR_DIR)/test-bin
+	$(CURR_DIR)/test-bin
+
+$(SRC_DIR)/%$(OBJ): $(SRC_DIR)/%$(F90)
+	$(FC) $(FCFLAGS) -c $< -o $@
+
+$(QUADPACK_DIR)/%$(OBJ): $(QUADPACK_DIR)/%$(F77)
+	$(FC) $(FCFLAGS) -c $< -o $@
+
+$(CURR_DIR)/test-bin: $(F77_OBJS) $(F90_OBJS) $(CURR_DIR)/test.f90
+	$(FC) $(FCFLAGS) \
+	  -o $(CURR_DIR)/test-bin \
+	  $(F77_OBJS) \
+	  $(F90_OBJS) \
+	  $(CURR_DIR)/test.f90
+
+clean:
+	rm -f $(CURR_DIR)/*.mod
+	rm -f $(SRC_DIR)/*$(OBJ)
+	rm -f $(QUADPACK_DIR)/*$(OBJ)
+	rm -f $(CURR_DIR)/test-bin
+
+.PHONY: all test clean

tests/fortran/README.md

@@ -0,0 +1,7 @@
+# Unit Tests for Fortran Surface of `libbezier`
+
+This is so that the Fortran source can evolve without
+having to have an equivalent Python function for every
+piece of code.
+
+To run the tests, simply run `make test` from this directory.

tests/fortran/test.f90

@@ -0,0 +1,8 @@
+program test
+
+  use types, only: dp
+  implicit none
+
+  print *, dp
+
+end program test