Chai Assertion Library

// eql() vs equal() — know the difference

// Numbers and strings — both work
pm.expect(42).to.equal(42);     // PASS
pm.expect(42).to.eql(42);       // PASS

// Objects — only eql() works
const a = { name: "John" };
const b = { name: "John" };
pm.expect(a).to.eql(b);         // PASS (same values)
pm.expect(a).to.equal(b);       // FAIL (different references!)

// Rule: use eql() for everything. It's safer.

// You can chain multiple checks in one assertion
pm.test("Title is a non-empty string", function () {
    const response = pm.response.json();
    pm.expect(response.title)
        .to.be.a("string")
        .and.not.be.empty
        .and.have.lengthOf.above(5);
});

// Negation — use .not anywhere in the chain
pm.test("Error field does not exist", function () {
    const response = pm.response.json();
    pm.expect(response).to.not.have.property("error");
});