test symlink bc

Author: scivision

+stdlib/create_symlink.m

@@ -11,10 +11,10 @@
 % For example, Matlab 25.1.0.2973910 R2025a Update 1 gave this error.
 
 function [i, b] = create_symlink(target, link, backend)
-arguments
-  target
-  link
-  backend (1,:) string = ["native", "dotnet", "python", "sys"]
+if nargin < 3
+  backend = ["native", "dotnet", "python", "sys"];
+else
+  backend = string(backend);
 end
 
 i = logical.empty;

+stdlib/is_symlink.m

@@ -8,9 +8,10 @@
 % * b: backend used
 
 function [i, b] = is_symlink(file, backend)
-arguments
-  file
-  backend (1,:) string = ["native", "java", "python", "dotnet", "sys"]
+if nargin < 2
+  backend = ["native", "java", "python", "dotnet", "sys"];
+else
+  backend = string(backend);
 end
 
 i = logical.empty;

+stdlib/read_symlink.m

@@ -11,9 +11,10 @@
 % * b: backend used
 
 function [r, b] = read_symlink(file, backend)
-arguments
-  file
-  backend (1,:) string = ["native", "java", "dotnet", "python", "sys"]
+if nargin < 2
+  backend = ["native", "java", "python", "dotnet", "sys"];
+else
+  backend = string(backend);
 end
 
 

test/TestSymlink.m

@@ -1,5 +1,5 @@
 classdef (SharedTestFixtures={ matlab.unittest.fixtures.PathFixture(fileparts(fileparts(mfilename('fullpath'))))}, ...
-          TestTags = {'R2019b', 'symlink', 'impure'}) ...
+          TestTags = {'R2017b', 'symlink'}) ...
     TestSymlink < matlab.unittest.TestCase
 
 properties
@@ -21,13 +21,14 @@
 % needs to be per-method because multiple functions are used to make the same files
 
 function setup_symlink(tc)
-tc.applyFixture(matlab.unittest.fixtures.WorkingFolderFixture())
+tc.applyFixture(matlab.unittest.fixtures.WorkingFolderFixture());
 
-tc.link = fullfile(pwd(), 'my.lnk');
+tc.link = [pwd(), '/my.lnk'];
 
-tc.target = stdlib.append(mfilename("fullpath"), '.m');
+tc.target = [pwd(), '/my_target.txt'];
+tc.assertTrue(stdlib.touch(tc.target), "failed to create test target " + tc.target)
 
-tc.assumeTrue(stdlib.create_symlink(tc.target, tc.link), ...
+tc.assertTrue(stdlib.create_symlink(tc.target, tc.link), ...
     "failed to create test link " + tc.link)
 end
 end
@@ -75,7 +76,7 @@ function test_create_symlink(tc, B_create_symlink)
 tc.applyFixture(matlab.unittest.fixtures.SuppressedWarningsFixture(["MATLAB:io:filesystem:symlink:TargetNotFound","MATLAB:io:filesystem:symlink:FileExists"]))
 
 ano = fullfile(pwd(), 'another.lnk');
-tc.assertThat(ano, ~matlab.unittest.constraints.IsFile)
+tc.assertFalse(isfile(ano))
 tc.assertFalse(stdlib.is_symlink(ano))
 
 r = stdlib.create_symlink(tc.target, ano, B_create_symlink);