Fix specs for SystemError#message on Windows when errno value is not …

…supported

core/exception/system_call_error_spec.rb

@@ -96,11 +96,23 @@ def initialize
   end
 
   it "sets an 'unknown error' message when an unknown error number" do
-    SystemCallError.new(-1).message.should =~ /Unknown error(:)? -1/
+    platform_is_not :windows do
+      SystemCallError.new(-1).message.should =~ /Unknown error(:)? -1/
+    end
+
+    platform_is :windows do
+      SystemCallError.new(-1).message.should == "The operation completed successfully."
+    end
   end
 
   it "adds a custom error message to an 'unknown error' message when an unknown error number and a custom message specified" do
-    SystemCallError.new("custom message", -1).message.should =~ /Unknown error(:)? -1 - custom message/
+    platform_is_not :windows do
+      SystemCallError.new("custom message", -1).message.should =~ /Unknown error(:)? -1 - custom message/
+    end
+
+    platform_is :windows do
+      SystemCallError.new(-1).message.should == "The operation completed successfully. - custom message"
+    end
   end
 
   it "converts to Integer if errno is a Complex convertible to Integer" do

optional/capi/kernel_spec.rb

@@ -197,9 +197,13 @@ class CApiKernelSpecs::Exc < StandardError
     end
 
     it "uses an 'unknown error' message when errno is unknown" do
-      -> do
-        @s.rb_syserr_fail(-10, nil)
-      end.should raise_error(SystemCallError, /Unknown error(:)? -1/) # a new class Errno::E-01 is generated on the fly
+      platform_is_not :windows do
+        -> { @s.rb_syserr_fail(-10, nil) }.should raise_error(SystemCallError, /Unknown error(:)? -10/)
+      end
+
+      platform_is :windows do
+        -> { @s.rb_syserr_fail(-1, nil) }.should raise_error(SystemCallError, "The operation completed successfully.")
+      end
     end
   end
 
@@ -217,9 +221,13 @@ class CApiKernelSpecs::Exc < StandardError
     end
 
     it "uses an 'unknown error' message when errno is unknown" do
-      -> do
-        @s.rb_syserr_fail_str(-1, nil)
-      end.should raise_error(SystemCallError, /Unknown error(:)? -1/) # a new class Errno::E-01 is generated on the fly
+      platform_is_not :windows do
+        -> { @s.rb_syserr_fail_str(-10, nil) }.should raise_error(SystemCallError, /Unknown error(:)? -10/)
+      end
+
+      platform_is :windows do
+        -> { @s.rb_syserr_fail_str(-1, nil) }.should raise_error(SystemCallError, "The operation completed successfully.")
+      end
     end
   end