Add regression tests to the round Expression function

worldedit-core/src/test/java/com/sk89q/worldedit/internal/expression/ExpressionTest.java

@@ -449,4 +449,14 @@ class ExpressionTest extends BaseExpressionTest {
         assertTrue(e.getMessage().contains("Calculations exceeded time limit"));
     }
 
+    @Test
+    public void testRound() {
+        checkTestCase("round(1.3)", 1);
+        checkTestCase("round(0.9)", 1);
+        checkTestCase("round(-1.1)", -1);
+        checkTestCase("round(-0.9)", -1);
+        checkTestCase("round(1.5)", 2);
+        checkTestCase("round(-1.5)", -1);
+    }
+
 }