file_size: require to be existing file

Author: scivision

+stdlib/file_size.m

@@ -7,12 +7,9 @@
 
 function s = file_size(p)
 arguments
-  p (1,1) string
+  p {mustBeTextScalar,mustBeFile}
 end
 
-s = [];
-if ~isfile(p), return, end
-
 if stdlib.isoctave()
   s = stat(p);
   if ~isempty(s)

test/TestFileImpure.m

@@ -14,19 +14,15 @@
 
 ph = {{0, '"stdin"'}, {1, '"stdout"'}, {2, '"stderr"'}, {fopen(tempname()), ""}}
 
-p_file_size = {mfilename("fullpath") + ".m", "", pwd()}
+p_file_size = {mfilename("fullpath") + ".m"}
 end
 
 
 methods (Test)
 
 function test_file_size(tc, p_file_size)
 s = stdlib.file_size(p_file_size);
-if isfile(p_file_size)
-  tc.verifyGreaterThan(s, 0)
-else
-  tc.verifyEmpty(s)
-end
+tc.verifyGreaterThan(s, 0)
 end