How to use the lightning/testUtils.shadowQuerySelectorAll function in lightning

return Promise.resolve().then(() => {
                const inputFields = shadowQuerySelectorAll(
                    element,
                    'lightning-input-field,lightning-output-field'
                );

                expect(inputFields[0].fieldName).toBe('Name');
            });
        });

return Promise.resolve().then(() => {
                const inputFields = shadowQuerySelectorAll(
                    element,
                    'lightning-input-field,lightning-output-field'
                );

                const fieldNames = Array.prototype.slice
                    .call(inputFields)
                    .map(field => {
                        return field.fieldName;
                    });
                expect(fieldNames).toEqual(fields);
            });
        });

return Promise.resolve().then(() => {
                const buttons = shadowQuerySelectorAll(
                    element,
                    'lightning-button-icon'
                );

                const outputFields = shadowQuerySelectorAll(
                    element,
                    'lightning-output-field'
                );

                checkNodeListLength(outputFields, 1);
                checkNodeListLength(buttons, 0);
            });
        });

return Promise.resolve().then(() => {
                const inputFields = shadowQuerySelectorAll(
                    element,
                    'lightning-input-field'
                );

                expect(inputFields[0].fieldName).toBe('Name');
            });
        });

return Promise.resolve().then(() => {
                const buttons = shadowQuerySelectorAll(
                    element,
                    'lightning-button-icon'
                );

                const outputFields = shadowQuerySelectorAll(
                    element,
                    'lightning-output-field'
                );

                checkNodeListLength(outputFields, 1);
                checkNodeListLength(buttons, 0);
            });
        });

return Promise.resolve().then(() => {
                const outputFields = shadowQuerySelectorAll(
                    element,
                    'lightning-button-icon'
                );

                const length = outputFields.length;
                expect(length).toEqual(2);
            });
        });

return Promise.resolve().then(() => {
                const inputFields = shadowQuerySelectorAll(
                    element,
                    'lightning-input-field'
                );

                const outputFields = shadowQuerySelectorAll(
                    element,
                    'lightning-output-field'
                );

                checkNodeListLength(inputFields, 1);
                checkNodeListLength(outputFields, 1);
            });
        });

return Promise.resolve().then(() => {
                    const inputFields = shadowQuerySelectorAll(
                        element,
                        'lightning-input-field,lightning-output-field'
                    );

                    expect(inputFields).toHaveLength(2);
                });
            });

return Promise.resolve().then(() => {
                const outputFields = shadowQuerySelectorAll(
                    element,
                    'lightning-output-field'
                );

                const length = outputFields.length;

                expect(length).toEqual(1);
            });
        });