fix: IN operator can be a list or single value (#327)

Author: BramKaashoek

.changeset/yellow-rabbits-marry.md

@@ -0,0 +1,5 @@
+---
+"@labdigital/commercetools-mock": patch
+---
+
+Fix IN operator to work correctly with array values in predicate parser

src/lib/predicateParser.test.ts

@@ -369,6 +369,14 @@ describe("Predicate filter", () => {
 			),
 		).toBeFalsy();
 	});
+
+	test("in operator with array values", async () => {
+		expect(match(`arrayProperty in ("foo")`)).toBeTruthy();
+		expect(match(`arrayProperty in ("bar")`)).toBeTruthy();
+		expect(match(`arrayProperty in ("missing")`)).toBeFalsy();
+		expect(match(`arrayProperty in ("foo", "bar")`)).toBeTruthy();
+		expect(match(`arrayProperty in ("missing", "alsomissing")`)).toBeFalsy();
+	});
 });
 
 describe("Report parse errors", () => {

src/lib/predicateParser.ts

@@ -403,6 +403,11 @@ const generateMatchFunc = (predicate: string): MatchFunc => {
 					resolveSymbol(item, vars),
 				);
 				const value = resolveValue(obj, left);
+
+				if (Array.isArray(value)) {
+					return inValues.some((inValue: any) => value.includes(inValue));
+				}
+
 				return inValues.includes(value);
 			};
 		})