test:hash: use temp dir method

Author: scivision

Readme.md

@@ -10,7 +10,7 @@ Matlab or
 users coming from other languages will benefit from the functionality contained within this user-developed, unofficial "stdlib" standard library of functions.
 These system, filesystem, and HDF5 / HDF4 / NetCDF functions are used across numerous projects.
 
-Matlab ≥ R2021a has full functionality.
+Matlab ≥ R2022a is required to run the self-test suite.
 Matlab R2019b is the minimum required due to use of
 [arguments](https://www.mathworks.com/help/matlab/ref/arguments.html)
 syntax.
@@ -21,10 +21,8 @@ Self-tests can be run from that matlab-stdlib/ directory:
 buildtool test
 ```
 
-## MEX C++
-
-Several functions are sped up with C++ Matlab MEX build.
-A couple functions are only available with C++ MEX build.
+Functions requiring or optionally benefiting from MEX are indicated in the
+[API Documentation](https://geospace-code.github.io/matlab-stdlib).
 
 ```matlab
 buildtool mex
@@ -38,7 +36,6 @@ legacy_mex_build()
 
 URLs (e.g. https://, s3:// and similar) are treated as not existing.
 
-[API Documentation](https://geospace-code.github.io/matlab-stdlib)
 
 ## Java-based functions
 

test/TestHash.m

@@ -1,5 +1,9 @@
 classdef TestHash < matlab.unittest.TestCase
 
+properties
+Folder
+end
+
 properties (TestParameter)
 type = {'sha256', 'md5'}
 hash = {"36c1bbbdfd8d04ef546ffb15b9c0a65767fd1fe9a6135a257847e3a51fb1426c", "d58cfb32e075781ba59082a8b18287f9"}
@@ -11,14 +15,17 @@ function java_required(tc)
 end
 end
 
+methods(TestMethodSetup)
+function setup_tempdir(tc)
+  tc.Folder = stdlib.posix(tc.createTemporaryFolder());
+end
+end
+
+
 methods (Test, ParameterCombination = 'sequential')
 
 function test_extract(tc)
 import matlab.unittest.constraints.IsFile
-import matlab.unittest.fixtures.TemporaryFolderFixture
-
-fixture = tc.applyFixture(TemporaryFolderFixture);
-tmpDir = fixture.Folder;
 
 r = fileparts(mfilename('fullpath'));
 fn = stdlib.posix(r) + "/hello.tar.zst";
@@ -27,8 +34,8 @@ function test_extract(tc)
 
 tc.assumeNotEmpty(stdlib.which("cmake"), "CMake not available")
 
-stdlib.extract_zstd(fn, tmpDir)
-tc.verifyThat(stdlib.posix(tmpDir) + "/test/hello.txt", IsFile)
+stdlib.extract_zstd(fn, tc.Folder)
+tc.verifyThat( tc.Folder + "/test/hello.txt", IsFile)
 
 end
 
@@ -50,14 +57,14 @@ function test_hash(tc, type, hash)
 
 function test_hash_text(tc)
 import matlab.unittest.constraints.IsFile
-import matlab.unittest.fixtures.TemporaryFolderFixture
-fixture = tc.applyFixture(TemporaryFolderFixture);
 
-fn = stdlib.posix(fixture.Folder) + "/hello";
+fn = tc.Folder + "/hello";
 fid = fopen(fn, "w");
+tc.addTeardown(@fclose, fid)
+
 tc.assumeGreaterThan(fid, 0);
 fprintf(fid, "hello");
-fclose(fid);
+
 tc.assumeThat(fn, IsFile)
 
 tc.verifyEqual(stdlib.file_checksum(fn, "md5"), "5d41402abc4b2a76b9719d911017c592")