diff --git a/src/Record/Timeline_Iterator.php b/src/Record/Timeline_Iterator.php
index 6ee6db7..3a3e1a8 100644
--- a/src/Record/Timeline_Iterator.php
+++ b/src/Record/Timeline_Iterator.php
@@ -52,6 +52,8 @@ class Timeline_Iterator implements \Iterator {
 	}
 
 	/**
+	 * @codeCoverageIgnore
+	 *
 	 * @return void
 	 */
 	public function key() {
diff --git a/tests/Record/IteratorTest.php b/tests/Record/IteratorTest.php
new file mode 100644
index 0000000..7effa57
--- /dev/null
+++ b/tests/Record/IteratorTest.php
@@ -0,0 +1,63 @@
+<?php
+
+use Rarst\Laps\Record\Recursive_Record_Iterator;
+use Rarst\Laps\Record\Timeline_Iterator;
+use Rarst\Laps\Tests\LapsTestCase;
+use Rarst\Laps\Tests\Record\StubRecord;
+
+class IteratorTest extends LapsTestCase {
+
+	public function testRecord() {
+
+		$record_a = new StubRecord( 'Parent', 0, 100 );
+		$record_b = new StubRecord( 'Child', 50, 100 );
+
+		$records = [ $record_b, $record_a ];
+
+		$iterator = new Recursive_Record_Iterator( $records );
+
+		$this->assertCount( 1, $iterator->getArrayCopy() );
+
+		foreach ( $iterator as $record ) {
+			$this->assertEquals( 'Parent', $record->get_name() );
+		}
+
+		$this->assertTrue( $iterator->hasChildren() );
+		$children = $iterator->getChildren();
+		$this->assertCount( 1, $children );
+
+		foreach ( $children as $record ) {
+			$this->assertEquals( 'Child', $record->get_name() );
+		}
+
+		return $iterator;
+	}
+
+	/**
+	 * @depends testRecord
+	 */
+	public function testTimeline( Recursive_Record_Iterator $iterator ) {
+
+		$iterator = new Timeline_Iterator( $iterator );
+
+		$iterator->rewind();
+		$this->assertTrue( $iterator->valid() );
+
+		$records = $iterator->current();
+		$this->assertInternalType( 'array', $records );
+
+		$this->assertArrayHasKey( 'description', $records[0] );
+		$this->assertArrayHasKey( 'category', $records[0] );
+		$this->assertArrayHasKey( 'offset', $records[0] );
+		$this->assertArrayHasKey( 'width', $records[0] );
+
+		$iterator->next();
+		$this->assertTrue( $iterator->valid() );
+
+		$records = $iterator->current();
+		$this->assertInternalType( 'array', $records );
+
+		$iterator->next();
+		$this->assertFalse( $iterator->valid() );
+	}
+}
diff --git a/tests/Record/SqlTest.php b/tests/Record/SqlTest.php
new file mode 100644
index 0000000..18bebdd
--- /dev/null
+++ b/tests/Record/SqlTest.php
@@ -0,0 +1,43 @@
+<?php
+
+namespace Rarst\Laps\Tests\Record;
+
+use Rarst\Laps\Record\Sql_Record;
+use Rarst\Laps\Record\Sql_Record_Collector;
+use Rarst\Laps\Tests\LapsTestCase;
+
+class SqlTest extends LapsTestCase {
+
+	public function testCollector() {
+
+		define( 'SAVEQUERIES', true );
+
+		$collector = new Sql_Record_Collector();
+
+		$this->assertTrue( has_filter( 'query', [ $collector, 'query' ] ) );
+
+		$query = 'SELECT * FROM wp_posts';
+
+		$collector->query( $query );
+
+		global $wpdb;
+
+		$wpdb            = new \stdClass();
+		$duration        = 100;
+		$wpdb->queries[] = [ $query, $duration ];
+
+		$records = $collector->get_records();
+
+		$this->assertInternalType( 'array', $records );
+		$this->assertCount( 1, $records );
+
+		$record = $records[0];
+
+		$this->assertInstanceOf( Sql_Record::class, $record );
+		$this->assertEquals( $query, $record->get_name() );
+		$this->assertContains( $query, $record->get_description() );
+		$this->assertInternalType( 'float', $record->get_origin() );
+		$this->assertEquals( $duration * 1000, $record->get_duration() );
+		$this->assertEquals( 'query-read', $record->get_category() );
+	}
+}
diff --git a/tests/Record/StubRecord.php b/tests/Record/StubRecord.php
new file mode 100644
index 0000000..1831c0d
--- /dev/null
+++ b/tests/Record/StubRecord.php
@@ -0,0 +1,38 @@
+<?php
+
+namespace Rarst\Laps\Tests\Record;
+
+use Rarst\Laps\Record\Record_Interface;
+
+class StubRecord implements Record_Interface {
+
+	protected $name;
+	protected $origin;
+	protected $duration;
+
+	public function __construct( $name, $origin, $duration ) {
+		$this->name     = $name;
+		$this->origin   = $origin;
+		$this->duration = $duration;
+	}
+
+	public function get_name() {
+		return $this->name;
+	}
+
+	public function get_description() {
+
+	}
+
+	public function get_origin() {
+		return $this->origin;
+	}
+
+	public function get_duration() {
+		return $this->duration;
+	}
+
+	public function get_category() {
+
+	}
+}