small edit of the MCFLIRT tests

Author: djarecka

nipype/interfaces/fsl/tests/test_preprocess.py

@@ -324,6 +324,12 @@ def test_mcflirt(setup_flirt):
     realcmd = 'mcflirt -in ' + infile + ' -out ' + outfile2
     assert frt.cmdline == realcmd
 
+
+@pytest.mark.skipif(no_fsl(), reason="fsl is not installed")
+def test_mcflirt_opt(setup_flirt):
+    tmpdir, infile, reffile = setup_flirt
+    _, nme = os.path.split(infile)
+
     opt_map = {
         'cost': ('-cost mutualinfo', 'mutualinfo'),
         'bins': ('-bins 256', 256),
@@ -344,6 +350,9 @@ def test_mcflirt(setup_flirt):
 
     for name, settings in list(opt_map.items()):
         fnt = fsl.MCFLIRT(in_file=infile, **{name: settings[1]})
+        outfile = os.path.join(os.getcwd(), nme)
+        outfile = fnt._gen_fname(outfile, suffix='_mcf')
+
         instr = '-in %s' % (infile)
         outstr = '-out %s' % (outfile)
         if name in ('init', 'cost', 'dof', 'mean_vol', 'bins'):
@@ -357,10 +366,14 @@ def test_mcflirt(setup_flirt):
                                             outstr,
                                             settings[0]])
 
+
+@pytest.mark.skipif(no_fsl(), reason="fsl is not installed")
+def test_mcflirt_noinput():
     # Test error is raised when missing required args
     fnt = fsl.MCFLIRT()
-    with pytest.raises(ValueError):
+    with pytest.raises(ValueError) as excinfo:
         fnt.run()
+    assert str(excinfo.value).startswith("MCFLIRT requires a value for input 'in_file'")
 
 # test fnirt