test: is_cygwin

Author: scivision

+stdlib/is_cygwin.m

@@ -0,0 +1,16 @@
+%% IS_CYGWIN  Detect if running under Cygwin
+
+function y = is_cygwin()
+
+y = false;
+
+if isunix() && ~ismac()
+  fid = fopen('/proc/version');
+  if fid > 0
+    v = fscanf(fid,'%s');
+    fclose(fid);
+    y = ~isempty(strfind(v, 'CYGWIN')); %#ok<STREMP>
+  end
+end
+
+end

+stdlib/iscygwin.m

@@ -1,7 +1,7 @@
 classdef TestSys < matlab.unittest.TestCase
 
 properties (TestParameter)
-fun = {stdlib.iscygwin, stdlib.isoctave, stdlib.isinteractive, stdlib.has_dotnet, ...
+fun = {stdlib.isoctave, stdlib.isinteractive, stdlib.has_dotnet, ...
        stdlib.has_java, stdlib.has_python}
 end
 
@@ -12,6 +12,10 @@ function test_platform_logical(tc, fun)
 tc.verifyClass(fun, 'logical')
 end
 
+function test_is_cygwin(tc)
+tc.verifyFalse(stdlib.is_cygwin())
+end
+
 function test_is_rosetta(tc)
 if ismac()
   tc.verifyClass(stdlib.is_rosetta(), 'logical')