tests: Add avm2/edittext_max_scroll_v_basic test

This test verifies how the max scroll behaves depending on
text field's height and text height.

tests/tests/swfs/avm2/edittext_max_scroll_v_basic/Test.as

@@ -0,0 +1,44 @@
+package {
+import flash.display.Sprite;
+import flash.text.TextField;
+import flash.text.TextFormat;
+
+public class Test extends Sprite {
+    [Embed(source="TestFont.ttf", fontName="TestFont", embedAsCFF="false", unicodeRange="U+0061-U+0064")]
+    private var TestFont:Class;
+
+    public function Test() {
+        stage.scaleMode = "noScale";
+
+        for (var h = 0; h < 50; ++h) {
+            for (var c = 0; c < 20; ++c) {
+                test(h, c);
+            }
+        }
+    }
+
+    private function test(height: int, chars: uint):void {
+        var text = new TextField();
+        text.multiline = true;
+        text.border = true;
+        text.width = 100;
+        text.height = height;
+        text.embedFonts = true;
+        var tf = new TextFormat();
+        tf.font = "TestFont";
+        tf.size = 20;
+        tf.leading = 6;
+        text.defaultTextFormat = tf;
+
+        var i = chars;
+        while (i > 1) {
+            text.text += "a\n";
+            i -= 2;
+        }
+        if (i > 0) {
+            text.text += "a";
+        }
+        trace("h=" + height + ",chars=" + chars + ",maxScrollV=" + text.maxScrollV + ",textHeight=" + text.textHeight);
+    }
+}
+}