multi select metadata field (#610)

src/main/java/com/box/sdk/Metadata.java

@@ -225,6 +225,22 @@ public Metadata test(String path, String value) {
         return this;
     }
 
+    /**
+     * Tests that a list of properties has the expected value.
+     * The values passed in will have to be an exact match with no extra elements.
+     * @param path      the path that designates the key. Must be prefixed with a "/".
+     * @param values    the list of expected values.
+     * @return          this metadata object.
+     */
+    public Metadata test(String path, List<String> values) {
+        JsonArray arr = new JsonArray();
+        for (String value : values) {
+            arr.add(value);
+        }
+        this.addOp("test", path, arr);
+        return this;
+    }
+
     /**
      * Returns a value.
      * @param path the path that designates the key. Must be prefixed with a "/".

src/test/java/com/box/sdk/MetadataTest.java

@@ -66,6 +66,22 @@ public void testTest() {
         Assert.assertEquals("bar", op.get("value").asString());
     }
 
+    @Test
+    @Category(UnitTest.class)
+    public void testMultiSelect() {
+        String expectedList = "[\"public test 1\",\"public test 2\",\"public test 3\"]";
+        List<String> list = new ArrayList<>();
+        list.add("public test 1");
+        list.add("public test 2");
+        list.add("public test 3");
+        Metadata m = new Metadata().test("/foo", list);
+        JsonArray operations = JsonArray.readFrom(m.getPatch());
+        JsonObject op = operations.get(0).asObject();
+        Assert.assertEquals("test", op.get("op").asString());
+        Assert.assertEquals("/foo", op.get("path").asString());
+        Assert.assertEquals(expectedList, op.get("value").toString());
+    }
+
     @Test
     @Category(UnitTest.class)
     public void testRemove() {