Fix paging issue where DataStatus was not updated on insert.

paging/lib/src/test/java/org/signal/paging/DataStatusTest.java

@@ -0,0 +1,58 @@
+package org.signal.paging;
+
+import org.junit.Test;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+
+public class DataStatusTest {
+
+  @Test
+  public void insertState_initiallyEmpty_InsertAtZero() {
+    DataStatus subject = DataStatus.obtain(0);
+    subject.insertState(0, true);
+
+    assertEquals(1, subject.size());
+    assertTrue(subject.get(0));
+  }
+
+  @Test
+  public void insertState_someData_InsertAtZero() {
+    DataStatus subject = DataStatus.obtain(2);
+    subject.mark(1);
+
+    subject.insertState(0, true);
+
+    assertEquals(3, subject.size());
+    assertTrue(subject.get(0));
+    assertFalse(subject.get(1));
+    assertTrue(subject.get(2));
+  }
+
+  @Test
+  public void insertState_someData_InsertAtOne() {
+    DataStatus subject = DataStatus.obtain(3);
+    subject.mark(1);
+
+    subject.insertState(1, true);
+
+    assertEquals(4, subject.size());
+    assertFalse(subject.get(0));
+    assertTrue(subject.get(1));
+    assertTrue(subject.get(2));
+    assertFalse(subject.get(3));
+  }
+
+  @Test(expected = IndexOutOfBoundsException.class)
+  public void insertState_negativeThrows() {
+    DataStatus subject = DataStatus.obtain(0);
+    subject.insertState(-1, true);
+  }
+
+  @Test(expected = IndexOutOfBoundsException.class)
+  public void insertState_largerThanSizePlusOneThrows() {
+    DataStatus subject = DataStatus.obtain(0);
+    subject.insertState(2, true);
+  }
+}