add a test

.travis.yml

@@ -13,4 +13,7 @@ install:
   - export CC=gcc-4.8
   - export CXX=g++-4.8
   - cd capnproto-c++-0.4.1 && ./configure && make -j5 && sudo make install && cd ..
-script: make CXX=g++-4.8 CXX_FLAGS="-std=c++11 -I/usr/local/include -L/usr/local/lib -lcapnp -lkj"
+script:
+  - sbt compile
+  - sbt test
+

project/build.scala

@@ -60,8 +60,10 @@ object Build extends sbt.Build {
 object Shared {
 
   val testDeps = Seq(
-    "org.scalatest" %% "scalatest" % "2.1.6" % "it,test",
+//    "org.scalatest" %% "scalatest" % "2.1.6" % "it,test",
-    "org.scalacheck" %% "scalacheck" % "1.11.4" % "it,test"
+//    "org.scalacheck" %% "scalacheck" % "1.11.4" % "it,test",
+    "com.novocode" % "junit-interface" % "0.10" % "test",
+    "junit" % "junit" % "4.11" % "test"
   )
 
   val settings = Seq(

runtime/src/main/java/org/capnproto/StructReader.java

@@ -58,6 +58,14 @@ public final class StructReader {
         }
     }
 
+    public final long getLongField(int offset) {
+        if ((offset + 1) * 64 <= this.dataSize) {
+            return this.segment.buffer.getLong(this.data + offset * 8);
+        } else {
+            return 0;
+        }
+    }
+
     public final PointerReader getPointerField(int ptrIndex) {
         if (ptrIndex < this.pointerCount) {
             return new PointerReader(this.segment,

runtime/src/test/java/org/capnproto/LayoutTest.java

@@ -0,0 +1,27 @@
+package org.capnproto;
+
+import java.nio.ByteBuffer;
+import org.junit.Test;
+
+import static org.hamcrest.core.IsEqual.equalTo;
+import static org.junit.Assert.assertThat;
+
+public class LayoutTest {
+
+    @Test
+    public void simpleRawDataStruct() {
+        byte[] data = {0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00,
+                       0x01, 0x23, 0x45, 0x67,
+                       (byte)(0x89 & 0xff), (byte)(0xab & 0xff),
+                       (byte)(0xcd & 0xff), (byte)(0xef & 0xff)};
+
+        ByteBuffer buffer = ByteBuffer.wrap(data);
+        buffer.order(java.nio.ByteOrder.LITTLE_ENDIAN);
+        PointerReader pointerReader = new PointerReader(new SegmentReader(buffer), 0, 0x7fffffff);
+        StructReader reader = pointerReader.getStruct();
+
+        assertThat(reader.getLongField(0), equalTo(0xefcdab8967452301L));
+
+    }
+
+}