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LWC test using jest testing framework throws error - unknown public property "smalldevicesize" of element


By : Dana M Knowles
Date : October 01 2020, 01:00 AM
seems to work fine You are using a wrong attribute name smalldevicesize this should be small-device-size
Here is an example:
code :
<lightning-layout-item small-device-size="">


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Protractor/jasmine test throws "UnknownError: unknown error: Maximum call stack size exceeded"


By : user2411200
Date : March 29 2020, 07:55 AM
help you fix your problem I'm having the same issue. I've found that returning big objects from the browser to protractor leads to the "UnknownError: unknown error: Maximum call stack size exceeded" error.
You should check the complexity of the resp object you're sending back with the callback. If it's too big, try to send back less data.

React - Testing a wrapper for server request with Jest and mock throws: "Error: read ECONNRESE"


By : user2030306
Date : March 29 2020, 07:55 AM
around this issue Found out what I was missing out on. I needed to add the following to my src/setupTests.ts:
code :
// react-testing-library renders your components to document.body,
// this will ensure they're removed after each test.
// this adds jest-dom's custom assertions
import "jest-dom/extend-expect";
import "react-testing-library/cleanup-after-each";
// setupJest.js or similar file
const globalAny: any = global;
// tslint:disable-next-line
globalAny.fetch = require("jest-fetch-mock");

Jest Testing with Bazel Throws "Module ts-jest in the transform option was not found"


By : user3519161
Date : March 29 2020, 07:55 AM
I hope this helps . Edit Real Issue
I took a second look. Leaving the bellow answer since I think it has useful stuff in it. Your version of build_bazel_rules_nodejs was rather old. Update to the newest version 1.01. You were on version 0.42.2 which I think has some weird ways it handles npm dependencies.
code :
http_archive(
    name = "build_bazel_rules_nodejs",
    sha256 = "e1a0d6eb40ec89f61a13a028e7113aa3630247253bcb1406281b627e44395145",
    urls = ["https://github.com/bazelbuild/rules_nodejs/releases/download/1.0.1/rules_nodejs-1.0.1.tar.gz"],
)
{
  "extends": "./tsconfig.json",
  "lib": ["jest"]
}

load("@npm_bazel_typescript//:index.bzl", "ts_config")
ts_config(
    name = "tsconfig.jest.json",
    src = "tsconfig.test.json",
    deps = [
        ":tsconfig.json",
    ],
)
load("@npm_bazel_typescript//:index.bzl", "ts_library")
ts_library(
    name = "test_lib",
    srcs = ["util.spec.ts"],
    # References the test tsconfig
    tsconfig = "//:tsconfig.jest.json",
    deps = [
        "//packages/enums/src:lib",
        "//packages/hello/src:lib",
        "@npm//faker",
        "@npm//@types/faker",
        "@npm//express",
        "@npm//@types/express",
        "@npm//cors",
        "@npm//@types/jest",
    ],
)

filegroup(
    name = "test_lib.js",
    srcs = [":test_lib"],
    output_group = "es5_sources",
)

load("@lbm//:jest.bzl", "jest_test")
jest_test(
    name = "test",
    srcs = [
        ":test_lib.js",
    ],
    jest_config = "@lbm//:jest.config.js",
    deps = [
        # UPDATE HERE
        ":lib",
        # END UPDATE 
        "//packages/enums/src:lib",
        "//packages/hello/src:lib",
        "@npm//faker",
        "@npm//express",
        "@npm//jest",
    ],
)

when I use jest to test react component it throws "Invariant Violation:Element type is invalid: expected a string (


By : user3674685
Date : March 29 2020, 07:55 AM
I wish this help you If you are trying to import the named export (Tooltip from export default Tooltip), this should fix it:
code :
import Tooltip from "../../../../../main/js/app/components/ui/Tooltip"
export class Tooltip extends React.Component {
 // the rest 
}
import { Tooltip } from "../../../../../main/js/app/components/ui/Tooltip"

Testing Vuejs and TypeScript with Jest causes an error "Property 'xxx' does not exist on type 'CombinedVueInstance'


By : masquare
Date : March 29 2020, 07:55 AM
I hope this helps you . You must specify type of wrapper.vm
A solution that works is to specify type to any :
code :
expect((wrapper.vm as any).sum(1, 2)).toEqual(3)
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