address Satra's comments

Author: salma1601

nipype/interfaces/afni/tests/test_auto_NwarpAdjust.py

@@ -15,17 +15,13 @@ def test_NwarpAdjust_inputs():
             nohash=True,
             usedefault=True,
         ),
-        in_files=dict(
-            argstr='-source %s',
-            mandatory=False,
-        ),
+        in_files=dict(argstr='-source %s', ),
         out_file=dict(
             argstr='-prefix %s',
             keep_extension=True,
-            mandatory=False,
             name_source='in_files',
             name_template='%s_NwarpAdjust',
-            xand=['in_files'],
+            xand=['requires'],
         ),
         terminal_output=dict(
             deprecated='1.0.0',

nipype/interfaces/afni/utils.py

@@ -1521,7 +1521,6 @@ class NwarpAdjustInputSpec(CommandLineInputSpec):
     in_files = InputMultiPath(
         File(exists=True),
         minlen=5,
-        mandatory=False,
         argstr='-source %s',
         desc='List of input 3D datasets to be warped by the adjusted warp '
              'datasets.  There must be exactly as many of these datasets as '
@@ -1531,11 +1530,10 @@ class NwarpAdjustInputSpec(CommandLineInputSpec):
              'The output dataset will be on the common grid shared by the '
              'source datasets.',
         argstr='-prefix %s',
-        mandatory=False,
         name_source='in_files',
         name_template='%s_NwarpAdjust',
         keep_extension=True,
-        xand=['in_files'])
+        xand=['requires'])
 
 
 class NwarpAdjust(AFNICommandBase):