test: improve tempdir efficiency

Author: scivision

Readme.md

@@ -12,6 +12,9 @@ These system, filesystem, and HDF5 / HDF4 / NetCDF functions are used across num
 
 Matlab R2019b is the minimum required due to use of
 [function argument validation](https://www.mathworks.com/help/matlab/ref/arguments.html).
+Full functionality on macOS and Windows require minimum of Matlab R2020b (most functions work in R2019b and newer).
+Full functionality on Linux with minimum Matlab R2019b.
+
 
 ## Self-tests
 

test/TestAbsolute.m

@@ -12,8 +12,8 @@
 
 methods(TestClassSetup)
 function test_dirs(tc)
-  tc.td = createTempdir(tc);
   pkg_path(tc)
+  tc.td = createTempdir(tc);
 
   tc.applyFixture(matlab.unittest.fixtures.CurrentFolderFixture(tc.td))
 end

test/private/createTempdir.m

@@ -3,13 +3,17 @@
   tc (1,1) matlab.unittest.TestCase
 end
 
-if stdlib.matlabOlderThan('R2022a')
+try
+  td = tc.createTemporaryFolder();
+catch e
+  if e.identifier ~= "MATLAB:noSuchMethodOrField"
+    rethrow(e)
+  end
+
   td = tempname();
   [ok, err] = mkdir(td);
   tc.assumeTrue(ok, err)
   tc.addTeardown(@() rmdir(td, 's'))
-else
-  td = tc.createTemporaryFolder();
 end
 
 assert(nargout == 1, "use this function to set a test Property or variable directly")