Added a basic unit test.

src/main/scala/com/lucidchart/open/relate/SqlQuery.scala

@@ -10,18 +10,27 @@ private[relate] case class ExpandableQuery(
   listParams: mutable.Map[String, ListParam] = mutable.Map[String, ListParam]()
 ) extends ParameterizableSql with Expandable {
 
+  val timeout: Option[Int] = None
+
   val params = Nil
   protected[relate] def queryParams = QueryParams(
     query,
     params,
     listParams
   )
 
+  protected def setTimeout(stmt: PreparedStatement): Unit = {
+    for {
+      seconds <- timeout
+      stmt <- Option(stmt)
+    } yield (stmt.setQueryTimeout(seconds))
+  }
+
   def withTimeout(seconds: Int): ExpandableQuery = new ExpandableQuery(query, listParams) {
+    override val timeout: Option[Int] = Some(seconds)
+
     override def applyParams(stmt: PreparedStatement) {
-      if (stmt != null) {
-        stmt.setQueryTimeout(seconds)
-      }
+      setTimeout(stmt)
 
       super.applyParams(stmt)
     }

src/test/scala/SqlQuerySpec.scala

@@ -0,0 +1,24 @@
+package com.lucidchart.open.relate
+
+import java.sql.Connection
+import java.sql.PreparedStatement
+import org.specs2.mutable._
+import org.specs2.mock.Mockito
+
+class SqlQuerySpec extends Specification with Mockito {
+
+
+  "ExpandableQuery.withTimeout" should {
+    class TestEq extends ExpandableQuery("")
+
+    "set the timeout" in {
+      val eq = new TestEq().withTimeout(10)
+      eq.timeout must beSome(10)
+    }
+
+    "not set the timtout" in {
+      val eq = new TestEq()
+      eq.timeout must beNone
+    }
+  }
+}