Fix mathics -f FILE arg

MANIFEST.in

@@ -7,4 +7,4 @@ include Makefile
 include mathics/Makefile
 include mathics/Makefile
 recursive-include mathics *.py
-recursive-include test *.py
+recursive-include test *.py *.m

mathics/main.py

@@ -323,7 +323,7 @@ def main() -> int:
             return exit_rc
 
     if args.FILE is not None:
-        feeder = FileLineFeeder(args.FILE)
+        feeder = MathicsFileLineFeeder(args.FILE)
         try:
             while not feeder.empty():
                 evaluation = Evaluation(

test/data/recursive-gcd.m

@@ -0,0 +1,40 @@
+(* Self-contained test for testing mathicscript <file>
+
+  Recursive GCD from https://mathematica.stackexchange.com/questions/156990/gcd-using-euclidean-algorithm
+  Test harness is the same used in Gries Schnieder testing.
+ *)
+
+ClearAll[expect, totalRight, totalWrong, totalTests];
+SetAttributes[ expect, HoldAllComplete ];
+totalRight = totalWrong = totalTests = 0;
+expect[expected_, actual_] := (* <~~~ Here's the API *)
+   Module[{evalActualOnce = actual,
+           evalExpectedOnce = expected},
+      totalTests += 1;
+      Print[ {"Test[" <> ToString[totalTests] <> "]:=\n",
+              HoldForm[actual],
+              "\nexpected", HoldForm[expected],
+              "\neval'd expected", evalExpectedOnce,
+              "\neval'd actual  ", evalActualOnce,
+              "\nright?",   evalExpectedOnce === evalActualOnce} ];
+      Print[ "" ]; (* newline *)
+      If[ evalExpectedOnce === evalActualOnce,
+          totalRight += 1,
+          totalWrong += 1 ];
+      {"total right", totalRight, "total wrong", totalWrong}
+      ];
+
+RecursiveGCD[a_, 0] := a;
+RecursiveGCD[a_, b_] := RecursiveGCD[b, Mod[a, b]];
+
+expect[6, RecursiveGCD[24, 18]]
+expect[1, RecursiveGCD[3, 5]]
+
+x = RandomInteger[{-100, 100}]
+expect[x, RecursiveGCD[x, 0]]
+expect[x, RecursiveGCD[2 x, x]]
+expect[x, RecursiveGCD[x 2, x]]
+(** uncomment to see a failure **)
+(*** expect[3 x, RecursiveGCD[x 2, x]] ***)
+Print["Total right: ", totalRight, ". Total wrong: ", totalWrong, ". Total tests: ", totalTests]
+If[ Or[totalTests <= 0, totalTests != totalRight], Quit[1], Quit[0]]

test/test_returncode.py

@@ -0,0 +1,18 @@
+import subprocess
+
+import os.path as osp
+
+def get_testdir():
+    filename = osp.normcase(osp.dirname(osp.abspath(__file__)))
+    return osp.realpath(filename)
+
+def test_returncode():
+    assert subprocess.run(["mathics", "-e", "Quit[5]"]).returncode == 5
+    assert subprocess.run(["mathics", "-e", "1 + 2'"]).returncode == 0
+    assert subprocess.run(["mathics", "-e", "Quit[0]"]).returncode == 0
+
+    gcd_file = osp.join(get_testdir(), "data", "recursive-gcd.m")
+    assert subprocess.run(["mathics", "-f", gcd_file]).returncode == 0
+
+if __name__ == "__main__":
+    test_returncode()