test: ram_* enhance

Author: scivision

+stdlib/ram_free.m

@@ -15,22 +15,31 @@
   % memory() was added cross-platform to Octave ~ 2021.
   % Matlab memory() at least through R2025a is still Windows only.
   m = memory();
-  bytes = uint64(m.MemAvailableAllArrays);
+
+  bytes = m.MemAvailableAllArrays;
+
 catch e
   switch e.identifier
     case {'MATLAB:memory:unsupported', 'Octave:undefined-function'}
-      b = javaMethod("getOperatingSystemMXBean", "java.lang.management.ManagementFactory");
+      if stdlib.has_java()
+        b = javaMethod("getOperatingSystemMXBean", "java.lang.management.ManagementFactory");
 
-      if stdlib.java_api() < 14
-        bytes = b.getFreePhysicalMemorySize();
+        if stdlib.java_api() < 14
+          bytes = b.getFreePhysicalMemorySize();
+        else
+          bytes = b.getFreeMemorySize();
+        end
       else
-        bytes = b.getFreeMemorySize();
+
+        bytes = 0;
+
       end
-      bytes = uint64(bytes);
     otherwise, rethrow(e)
   end
 end
 
+bytes = uint64(bytes);
+
 end
 
 %!assert(ram_free()>0)

test/TestSys.m

@@ -72,19 +72,26 @@ function test_cpu_arch(tc)
 tc.verifyGreaterThan(strlength(arch), 0)
 end
 
-function test_ram(tc)
+function test_ram_total(tc)
 tc.assumeTrue(stdlib.has_dotnet() || stdlib.has_java())
 
 t = stdlib.ram_total();
 tc.verifyGreaterThan(t, 0)
 tc.verifyClass(t, 'uint64')
+end
+
+
+function test_ram_free(tc)
+tc.assumeTrue(ispc() || stdlib.has_java())
 
 f = stdlib.ram_free();
 tc.verifyGreaterThan(f, 0)
 tc.verifyClass(f, 'uint64')
 
-tc.verifyLessThanOrEqual(f, t)
+tc.verifyLessThanOrEqual(f, stdlib.ram_total(), ...
+    "Free RAM should be less than or equal to total RAM")
 end
 
 end
+
 end