Filter expressions to source files in tests

java/ql/test/kotlin/library-tests/exprs/exprs.ql

@@ -35,4 +35,5 @@ MaybeElement enclosingCallable(Expr e) {
 }
 
 from Expr e
+where e.getFile().isSourceFile()
 select e, enclosingCallable(e), e.getPrimaryQlClasses()

java/ql/test/kotlin/library-tests/literals/literals.ql

@@ -1,4 +1,5 @@
 import java
 
 from Literal l
+where l.getFile().isSourceFile()
 select l, l.getPrimaryQlClasses()

java/ql/test/kotlin/library-tests/stmts/exprs.ql

@@ -1,4 +1,5 @@
 import java
 
 from Expr e
+where e.getFile().isSourceFile()
 select e, e.getPrimaryQlClasses()

java/ql/test/kotlin/library-tests/variables/variableAccesses.ql

@@ -1,6 +1,6 @@
 import java
 
-query predicate varAcc(VarAccess va) { any() }
+query predicate varAcc(VarAccess va) { va.getFile().isSourceFile() }
 
 query predicate extensionReceiverAcc(ExtensionReceiverAccess va) { any() }