has_python more robust

Author: scivision

+stdlib/has_python.m

@@ -1,13 +1,16 @@
+%% HAS_PYTHON checks if Python is available in the current environment.
+
 function y = has_python()
 
 try
   pe = pyenv();
 catch e
-  if strcmp(e.identifier, 'Octave:undefined-function')
-    y = false;
-    return
-  else
-    rethrow(e);
+  switch e.identifier
+    case {'Octave:undefined-function', 'MATLAB:Python:PythonUnavailable'}
+      y = false;
+      return
+    otherwise
+      rethrow(e);
   end
 end
 

test/TestSys.m

@@ -1,7 +1,8 @@
 classdef TestSys < matlab.unittest.TestCase
 
 properties (TestParameter)
-fun = {stdlib.iscygwin, stdlib.isoctave, stdlib.is_rosetta, stdlib.isinteractive}
+fun = {stdlib.iscygwin, stdlib.isoctave, stdlib.is_rosetta, stdlib.isinteractive, stdlib.has_dotnet, ...
+       stdlib.has_java, stdlib.has_python}
 fi32 = {stdlib.is_wsl}
 end
 
@@ -16,6 +17,18 @@ function test_platform_int32(tc, fi32)
 tc.verifyClass(fi32, 'int32')
 end
 
+function test_dotnet_version(tc)
+tc.assumeTrue(stdlib.has_dotnet())
+v = stdlib.dotnet_version();
+tc.verifyGreaterThan(v, "4.0", ".NET version should be greater than 4.0")
+end
+
+function test_has_python(tc)
+tc.assumeTrue(stdlib.has_python())
+v = stdlib.python_version();
+tc.verifyGreaterThan(strlength(v), 0, "expected non-empty Python version")
+end
+
 function test_os_version(tc)
 tc.assumeTrue(stdlib.has_dotnet() || stdlib.has_java())