Add tests for java jni bindings

Summary: Add tests for java jni integration

Reviewed By: lucasr

Differential Revision: D4008411

fbshipit-source-id: c896a3925ff3f7fa368176a3d03c84eb7188ef60

java/tests/com/facebook/csslayout/CSSNodeTest.java

@@ -0,0 +1,61 @@
+/**
+ * Copyright (c) 2014-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ */
+
+package com.facebook.csslayout;
+
+import org.junit.Test;
+
+import static org.junit.Assert.assertEquals;
+
+public class CSSNodeTest {
+
+  @Test
+  public void testInit() {
+    final int refCount = CSSNode.jni_CSSNodeGetInstanceCount();
+    final CSSNode node = new CSSNode();
+    assertEquals(refCount + 1, CSSNode.jni_CSSNodeGetInstanceCount());
+  }
+
+  @Test
+  public void testFree() {
+    final int refCount = CSSNode.jni_CSSNodeGetInstanceCount();
+    final CSSNode node = new CSSNode();
+    node.free();
+    assertEquals(refCount, CSSNode.jni_CSSNodeGetInstanceCount());
+  }
+
+  @Test
+  public void testReinit() {
+    final int refCount = CSSNode.jni_CSSNodeGetInstanceCount();
+    final CSSNode node = new CSSNode();
+    node.free();
+    node.reinit();
+    assertEquals(refCount + 1, CSSNode.jni_CSSNodeGetInstanceCount());
+  }
+
+  @Test
+  public void testMeasure() {
+    final CSSNode node = new CSSNode();
+    node.setMeasureFunction(new CSSNodeAPI.MeasureFunction() {
+        public void measure(
+            CSSNodeAPI node,
+            float width,
+            CSSMeasureMode widthMode,
+            float height,
+            CSSMeasureMode heightMode,
+            MeasureOutput measureOutput) {
+          measureOutput.width = 100;
+          measureOutput.height = 100;
+        }
+    });
+    node.calculateLayout(null);
+    assertEquals(100, (int) node.getLayoutWidth());
+    assertEquals(100, (int) node.getLayoutHeight());
+  }
+}