"Exploring the intersection of Jest and GraphQL through integration testing with error

Currently, I am working on integration tests for my db and graphql server using jest as my test runner and assertions library.

During each test, I verify that there are no errors by checking:

const result = await graphql(schema, query);
expect(result.errors).toBeUndefined();

However, when a test fails due to an error, the result.errors is not undefined. Instead of displaying the error message, jest shows:

Expected value to be undefined, instead received
  [[GraphQLError: Invalid value [object Object]]]

This message does not provide enough information about what the actual "invalid value" is. How can I configure jest to print the complete error object?

javascripttypescriptgraphqljestjs

Answer №1

When dealing with jest, the [object Object] is actually generated by calling object.toString() which is then displayed in the error log. If you wish to view more details about the object, you must modify the toString function of the object. You can accomplish this using the following code:

obj = {x:"x"};
alert(obj)
obj.toString = function(){return JSON.stringify(obj)};
alert(obj)

Answer №2

When you encounter the error message 

GraphQLError: Invalid value [object Object]
, it is likely due to mistakenly passing the string [object Object] instead of the intended object. This could be an issue with your schema, query, or roots setup. Without access to these components, pinpointing the exact problem becomes a matter of speculation.

Exploring the graphql object reveals valuable properties that are not automatically logged but greatly aid in debugging efforts. Two particularly useful ones are error.path and error.stack. For a comprehensive list, refer to the error object source.

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