Use a dummy implementation of Narrator library

JavaApp/src/main/java/com/mojang/text2speech/Narrator.java

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+package com.mojang.text2speech;
+
+public interface Narrator {
+    void say(final String msg, final boolean interrupt);
+
+    void clear();
+
+    boolean active();
+
+    void destroy();
+
+    static Narrator getNarrator() {
+        return new NarratorDummy();
+    }
+
+    static void setJNAPath(String sep) {
+        System.setProperty("jna.library.path", System.getProperty("jna.library.path") + sep + "./src/natives/resources/");
+        System.setProperty("jna.library.path", System.getProperty("jna.library.path") + sep + System.getProperty("java.library.path"));
+    }
+}

JavaApp/src/main/java/com/mojang/text2speech/NarratorDummy.java

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+package com.mojang.text2speech;
+
+public class NarratorDummy implements Narrator {
+    @Override
+    public void say(final String msg, final boolean interrupt) {
+    }
+
+    @Override
+    public void clear() {
+    }
+
+    @Override
+    public boolean active() {
+        return false;
+    }
+
+    @Override
+    public void destroy() {
+
+    }
+}

JavaApp/src/main/java/com/mojang/text2speech/NarratorLinux.java

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+package com.mojang.text2speech;
+
+public class NarratorLinux extends NarratorDummy {
+}

JavaApp/src/main/java/com/mojang/text2speech/NarratorOSX.java

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+package com.mojang.text2speech;
+
+public class NarratorOSX extends NarratorDummy {
+}

JavaApp/src/main/java/com/mojang/text2speech/NarratorWindows.java

@@ -0,0 +1,4 @@
+package com.mojang.text2speech;
+
+public class NarratorWindows extends NarratorDummy {
+}

JavaApp/src/main/java/com/mojang/text2speech/Text2Speech.java

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+package com.mojang.text2speech;
+
+public class Text2Speech {
+    public static void main(final String[] args) {
+        System.setProperty("jna.library.path", "./src/natives/resources/");
+        final Narrator narrator = Narrator.getNarrator();
+        narrator.say("This is a test", false);
+
+        while (true) {
+            try {
+                Thread.sleep(100);
+            } catch (final InterruptedException e) {
+                e.printStackTrace();
+            }
+        }
+    }
+}