test: which: check assumptions

Author: scivision

+stdlib/which.m

@@ -27,7 +27,7 @@
   return
 end
 
-%  relative directory component, but path was not a file
+%  relative directory component, but path was not an executable file
 if ~strcmp(stdlib.filename(cmd), cmd)
   return
 end

test/TestWhich.m

@@ -39,8 +39,10 @@ function test_which_absolute(tc, mexe)
 end
 
 tc.assumeThat(r, matlab.unittest.constraints.IsFile)
+tc.assumeTrue(stdlib.is_exe(r))
 
-tc.verifyEqual(stdlib.which(mexe), r)
+tc.verifyGreaterThan(strlength(stdlib.which(r)), 0, "Expected which(" + r + " ) to find " + r)
+tc.verifyGreaterThan(strlength(stdlib.which(mexe)), 0, "Expected which(" + mexe + ") to find " + r)
 
 end