In Chai assertion library, we can assert a deep property to exist and have a value:

expect(obj).to.have.deep.property("field1.field2", 1);

But, what if we need to assert this property to have one of multiple values? In this case, the test should pass if obj has a field1.field2 property that has 0 or 1 or 2 value.

FYI, I need this to check that a ESLint plugin ships with a remended rules configuration that has a "warning level" configured for every rule. Warning level can be of 0, 1 or 2 values.

In Chai assertion library, we can assert a deep property to exist and have a value:

expect(obj).to.have.deep.property("field1.field2", 1);

But, what if we need to assert this property to have one of multiple values? In this case, the test should pass if obj has a field1.field2 property that has 0 or 1 or 2 value.

FYI, I need this to check that a ESLint plugin ships with a remended rules configuration that has a "warning level" configured for every rule. Warning level can be of 0, 1 or 2 values.

• javascript
• testing
• chai
• assertions

1 Answer 1

You can use .oneOf():

expect(obj).to.have.deep.property('field1.field2').that.is.oneOf([ 0, 1, 2 ])

Or .within():

expect(obj).to.have.deep.property('field1.field2').that.is.within(0, 2)