--- /dev/null	2018-05-31 15:13:06.000000000 -0700
+++ new/test/jdk/java/awt/font/TextLayout/VariationSelectorTest.java	2018-05-31 15:13:05.000000000 -0700
@@ -0,0 +1,64 @@
+/* @test
+ * @summary Verify two identical 'a's are rendered
+ * @bug 8187100
+ * @ignore Requires a special font installed.
+ */
+import javax.swing.JFrame;
+import javax.swing.JComponent;
+import javax.swing.SwingUtilities;
+import javax.swing.WindowConstants;
+import java.awt.Font;
+import java.awt.Graphics;
+import java.awt.Graphics2D;
+import java.awt.font.FontRenderContext;
+import java.awt.font.GlyphVector;
+
+public class VariationSelectorTest {
+    // A font supporting Unicode variation selectors is required
+    private static final Font FONT = new Font("DejaVu Sans", Font.PLAIN, 12);
+
+    public static void main(String[] args) {
+        final String fontName = FONT.getFontName();
+        if (!fontName.equals("DejaVuSans")) {
+            System.err.println("*** Warning: Font DejaVuSans not installed.");
+            System.err.println("*** Using font: " + fontName);
+        }
+        SwingUtilities.invokeLater(() -> {
+            JFrame frame = new JFrame();
+            frame.setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
+            frame.add(new MyComponent());
+            frame.setSize(200, 200);
+            frame.setVisible(true);
+            frame.setLocationRelativeTo(null);
+        });
+    }
+
+    private static class MyComponent extends JComponent {
+        @Override
+        protected void paintComponent(Graphics g) {
+            Graphics2D g2d = (Graphics2D) g;
+            FontRenderContext frc = g2d.getFontRenderContext();
+            String text = "a";
+            GlyphVector gv = FONT.layoutGlyphVector(
+                                 frc, text.toCharArray(), 0, text.length(),
+                                 Font.LAYOUT_LEFT_TO_RIGHT);
+            System.out.println("'a'=" + gv.getNumGlyphs());
+            g2d.drawString("=" + gv.getNumGlyphs() + " ('a')", 100, 50);
+            g2d.drawGlyphVector(gv, 80, 50);
+            String text2 = "a\ufe00";
+            GlyphVector gv2 = FONT.layoutGlyphVector(
+                                 frc, text2.toCharArray(), 0, text2.length(),
+                                 Font.LAYOUT_LEFT_TO_RIGHT);
+            g2d.drawGlyphVector(gv2, 80, 100);
+            System.out.println("'a'+VS=" + gv2.getNumGlyphs());
+            g2d.drawString("=" + gv2.getNumGlyphs() + " ('a'+VS)", 100, 100);
+            if ((gv.getNumGlyphs() == 1) && (gv2.getNumGlyphs() == 1)) {
+                System.out.println("PASS");
+                g2d.drawString("PASS", 10, 15);
+            } else {
+                System.err.println("FAIL");
+                g2d.drawString("FAIL", 10, 15);
+            }
+        }
+    }
+}