make unit test work for 19b and earlier

Author: petercorke

unit_test/PlotTest.m

@@ -16,9 +16,8 @@ function tranimate_test(tc)
 
     clf
     tranimate(X1, X2, 'axis', [-10 10 -20 20 -30 30]);
-    v = axis;
-    %tc.verifyEqual(v, [-10 10 -20 20 -30 30]);
-    tc.verifyEqual(v, [-10 10 -20 20]); % 19b doesnt give 
+    ax = gca; v = [ax.XLim ax.YLim ax.ZLim];
+    tc.verifyEqual(v, [-10 10 -20 20 -30 30]); % 19b doesnt give 
 
     tranimate(X1, X2, 'noxyz');
     tranimate(X1, X2, 'rgb');