Coverage improvements

Because "age" is already an Expression<Int?>, many test paths weren't
being hit.

Signed-off-by: Stephen Celis <stephen@stephencelis.com>

SQLite Tests/ExpressionTests.swift

@@ -454,7 +454,7 @@ class ExpressionTests: SQLiteTestCase {
     }
 
     let email2 = Expression<String?>("email")
-    let age2 = Expression<Int?>("age")
+    let age2 = Expression<Int>("age")
     let salary2 = Expression<Double?>("salary")
     let admin2 = Expression<Bool?>("admin")
 

SQLite Tests/FTSTests.swift

@@ -14,6 +14,12 @@ class FTSTests: SQLiteTestCase {
         AssertSQL("CREATE VIRTUAL TABLE \"emails\" USING fts4(\"subject\", \"body\")")
     }
 
+    func test_createVtable_usingFts4_withSimpleTokenizer_createsVirtualTableWithTokenizer() {
+        db.create(vtable: emails, using: fts4([subject, body], tokenize: .Simple))
+
+        AssertSQL("CREATE VIRTUAL TABLE \"emails\" USING fts4(\"subject\", \"body\", tokenize=simple)")
+    }
+
     func test_createVtable_usingFts4_withPorterTokenizer_createsVirtualTableWithTokenizer() {
         db.create(vtable: emails, using: fts4([subject, body], tokenize: .Porter))