Swift: Add tests for LogicalOperaion.qll.

swift/ql/test/library-tests/elements/expr/logicaloperation/logicaloperation.ql

@@ -0,0 +1,12 @@
+import swift
+
+string describe(LogicalOperation e) {
+	(e instanceof BinaryLogicalOperation and result = "BinaryLogicalExpr") or
+	(e instanceof LogicalAndExpr and result = "LogicalAndExpr") or
+	(e instanceof LogicalOrExpr and result = "LogicalOrExpr") or
+	(e instanceof UnaryLogicalOperation and result = "UnaryLogicalOperation") or
+	(e instanceof NotExpr and result = "NotExpr")
+}
+
+from LogicalOperation e
+select e, concat(describe(e), ", ")

swift/ql/test/library-tests/elements/expr/logicaloperation/logicaloperation.swift

@@ -0,0 +1,8 @@
+
+func test(a: Bool, b: Bool, c: Bool) {
+	// logical operations
+	if (a && b) {}
+	if (a || b) {}
+	if (!a) {}
+	if (!((a && b) || c)) {}
+}