Swift: add more tests for the generated parent-child relationship

Author: redsun82

swift/ql/test/library-tests/parent/child.expected

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+import swift
+import codeql.swift.generated.ParentChild
+import TestUtils
+
+from AstNode parent, AstNode child, int index, string accessor
+where
+  toBeTested(parent) and
+  child = getImmediateChildAndAccessor(parent, index, accessor)
+select parent, index, accessor, child

swift/ql/test/library-tests/parent/child.ql

@@ -0,0 +1,10 @@
+import swift
+private import codeql.swift.generated.ParentChild
+
+from AstNode parent, int index, AstNode child1, AstNode child2
+where
+  child1 != child2 and
+  child1 = getImmediateChildAndAccessor(parent, index, _) and
+  child2 = getImmediateChildAndAccessor(parent, index, _)
+select parent, parent.getPrimaryQlClasses(), index, child1, child1.getPrimaryQlClasses(), child2,
+  child2.getPrimaryQlClasses()

swift/ql/test/library-tests/parent/no_double_children.expected

@@ -0,0 +1,9 @@
+import swift
+private import codeql.swift.generated.ParentChild
+
+from AstNode parent, int index1, int index2, AstNode child
+where
+  index1 != index2 and
+  child = getImmediateChildAndAccessor(parent, index1, _) and
+  child = getImmediateChildAndAccessor(parent, index2, _)
+select parent, parent.getPrimaryQlClasses(), child, child.getPrimaryQlClasses(), index1, index2