Swift: Additional test case.

Author: geoffw0

swift/ql/test/query-tests/Security/CWE-311/SensitiveExprs.expected

@@ -13,6 +13,7 @@
 | testRealm.swift:34:11:34:11 | myPassword | label:myPassword, type:credential |
 | testRealm.swift:42:11:42:11 | myPassword | label:myPassword, type:credential |
 | testRealm.swift:52:12:52:12 | myPassword | label:myPassword, type:credential |
+| testRealm.swift:59:11:59:11 | myPassword | label:myPassword, type:credential |
 | testSend.swift:29:19:29:19 | passwordPlain | label:passwordPlain, type:credential |
 | testSend.swift:33:19:33:19 | passwordPlain | label:passwordPlain, type:credential |
 | testSend.swift:45:13:45:13 | password | label:password, type:credential |

swift/ql/test/query-tests/Security/CWE-311/testRealm.swift

@@ -53,6 +53,11 @@ func test1(realm : Realm, myPassword : String, myHashedPassword : String) {
 
 	var f = realm.object(ofType: MyRealmSwiftObject.self, forPrimaryKey: "key")
 	f!.data = myHashedPassword // GOOD (not sensitive)
+
+	let g = MyRealmSwiftObject()
+	g.data = "" // GOOD (not sensitive)
+	g.data = myPassword // BAD [NOT DETECTED]
+	g.data = "" // GOOD (not sensitive)
 }
 
 // limitation: its possible to configure a Realm DB to be stored encrypted, if this is done correctly