test and handle more corner cases

Author: scivision

+stdlib/absolute.m

@@ -43,4 +43,8 @@
   end
 end
 
+if isstring(p)
+  c = string(c);
+end
+
 end

+stdlib/canonical.m

@@ -21,7 +21,7 @@
 
 if s == 1
   c = r.Name;
-elseif ~strict
+elseif ~strict && ~stdlib.strempty(r)
   c = stdlib.normalize(file);
 else
   c = '';

+stdlib/cpu_load.m

@@ -10,8 +10,10 @@
 % If the system recent cpu usage is not available, the backend returns a negative or NaN value.
 
 function [i, b] = cpu_load(backend)
-arguments
-  backend (1,:) string = ["java", "python", "sys"]
+if nargin < 1
+  backend = ["java", "python", "sys"];
+else
+  backend = string(backend);
 end
 
 i = [];

+stdlib/get_username.m

@@ -7,8 +7,10 @@
 % * b: backend used
 
 function [r, b] = get_username(backend)
-arguments
-  backend (1,:) string = ["java", "dotnet", "python", "sys"]
+if nargin < 1
+  backend = ["java", "dotnet", "python", "sys"];
+else
+  backend = string(backend);
 end
 
 r = '';

+stdlib/hostname.m

@@ -9,8 +9,10 @@
 % Ref: https://docs.oracle.com/javase/8/docs/api/java/net/InetAddress.html#getHostName--
 
 function [r, b] = hostname(backend)
-arguments
-  backend (1,:) string = ["java", "dotnet", "python", "sys"]
+if nargin < 1
+  backend = ["java", "dotnet", "python", "sys"];
+else
+  backend = string(backend);
 end
 
 r = '';

+stdlib/is_admin.m

@@ -5,8 +5,10 @@
 % * b: backend used
 
 function [i, b] = is_admin(backend)
-arguments
-  backend (1,:) string = ["java", "dotnet", "perl", "python", "sys"]
+if nargin < 1
+  backend = ["java", "dotnet", "perl", "python", "sys"];
+else
+  backend = string(backend);
 end
 
 i = logical.empty;

+stdlib/os_version.m

@@ -11,8 +11,10 @@
 % Ref: https://bugs.openjdk.org/browse/JDK-8274840
 
 function [os, version, b] = os_version(backend)
-arguments
-  backend (1,:) string = ["sys", "python", "dotnet", "java"]
+if nargin < 1
+  backend = ["sys", "python", "dotnet", "java"];
+else
+  backend = string(backend);
 end
 
 os = '';

+stdlib/ram_free.m

@@ -13,8 +13,10 @@
 
 
 function [i, b] = ram_free(backend)
-arguments
-  backend (1,:) string = ["java", "python", "sys"]
+if nargin < 1
+  backend = ["java", "python", "sys"];
+else
+  backend = string(backend);
 end
 
 i = uint64.empty;

+stdlib/ram_total.m

@@ -10,8 +10,10 @@
 % * b: backend used
 
 function [i, b] = ram_total(backend)
-arguments
-  backend (1,:) string = ["java", "dotnet", "python", "sys"]
+if nargin < 1
+  backend = ["java", "dotnet", "python", "sys"];
+else
+  backend = string(backend);
 end
 
 i = uint64.empty;

test/TestAbsolute.m

@@ -3,7 +3,7 @@
     TestAbsolute < matlab.unittest.TestCase
 
 properties (TestParameter)
-p1 = {'', "hi", "./hi", "../hi"};
+p1 = {'', "", "hi", './hi', "../hi"};
 p2 = {{'', ''}, {'', 'hi'}, {"hi", ""}, {'there', 'hi'}};
 end
 
@@ -25,6 +25,10 @@ function test_absolute1arg(tc, p1)
   r = pwd();
 end
 
+if isstring(p1)
+  r = string(r);
+end
+
 rabs = stdlib.absolute(p1);
 
 tc.verifyClass(rabs, class(p1))