initial test for JSONPointer class

src/test/org/json/junit/JSONPointerTest.java

@@ -0,0 +1,78 @@
+package org.json.junit;
+
+import static org.junit.Assert.assertSame;
+
+import org.json.JSONObject;
+import org.json.JSONPointer;
+import org.json.JSONPointerException;
+import org.junit.Test;
+
+public class JSONPointerTest {
+
+    private static final JSONObject document = new JSONObject("{"
+            + "\"foo\": [\"bar\", \"baz\"], "
+            + "\"\": 0,"
+            + "\"a/b\": 1,"
+            + "\"c%d\": 2,"
+            + "\"e^f\": 3,"
+            + "\"g|h\": 4," + "\"i\\\\j\": 5,"
+            + "\"k\\\"l\": 6,"
+            + "\" \": 7,"
+            + "\"m~n\": 8"
+            + "}");
+
+    private Object query(String pointer) {
+        return new JSONPointer(pointer).queryFrom(document);
+    }
+
+    @Test
+    public void emptyPointer() {
+        assertSame(document, query(""));
+    }
+
+    @Test(expected = NullPointerException.class)
+    public void nullPointer() {
+        new JSONPointer(null);
+    }
+
+    @Test
+    public void objectPropertyQuery() {
+        assertSame(document.get("foo"), query("/foo"));
+    }
+
+    @Test
+    public void arrayIndexQuery() {
+        assertSame(document.getJSONArray("foo").get(0), query("/foo/0"));
+    }
+
+    @Test(expected = JSONPointerException.class)
+    public void stringPropOfArrayFailure() {
+        query("/foo/bar");
+    }
+
+    @Test
+    public void queryByEmptyKey() {
+        assertSame(document.get(""), query("/"));
+    }
+
+    @Test
+    public void slashEscaping() {
+        assertSame(document.get("a/b"), query("/a~1b"));
+    }
+
+    @Test
+    public void tildeEscaping() {
+        assertSame(document.get("m~n"), query("/m~0n"));
+    }
+
+    @Test
+    public void uriFragmentNotation() {
+        assertSame(document.get("foo"), query("#/foo"));
+    }
+
+    @Test(expected = IllegalArgumentException.class)
+    public void syntaxError() {
+        new JSONPointer("key");
+    }
+
+}