test: add failing tests for enums with type [string, null]

Author: toomuchdesign

packages/openapi-typescript/test/schema-object.test.ts

@@ -278,12 +278,19 @@ describe("Schema Object", () => {
         expect(generated).toBe("OneOf<[string, boolean, number, null]>");
       });
 
-      test("enum + polymorphism + nullable", () => {
-        const generated = transformSchemaObject(
-          { type: ["string", "null"], enum: ["", "false positive", "won't fix", "used in tests"] },
-          options
-        );
-        expect(generated).toBe(`"" | "false positive" | "won't fix" | "used in tests" | null`);
+      test("enum + polymorphism + nullable 1", () => {
+        const generated = transformSchemaObject({ type: ["string", "null"], enum: ["false positive", "won't fix", "used in tests"] }, options);
+        expect(generated).toBe(`"false positive" | "won't fix" | "used in tests"`);
+      });
+
+      test("enum + polymorphism + nullable 2", () => {
+        const generated = transformSchemaObject({ type: ["string", "null"], enum: ["", "false positive", "won't fix", "used in tests"] }, options);
+        expect(generated).toBe(`"" | "false positive" | "won't fix" | "used in tests"`);
+      });
+
+      test("enum + polymorphism + nullable 3", () => {
+        const generated = transformSchemaObject({ type: ["string", "null"], enum: [null, "false positive", "won't fix", "used in tests"] }, options);
+        expect(generated).toBe(`null | "false positive" | "won't fix" | "used in tests"`);
       });
     });
   });