captureAssertion() — react Function Reference

Architecture documentation for the captureAssertion() function in reactTestMatchers.js from the react codebase.

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BabelCompiler→ Entrypoint→ captureAssertion() — react Function Reference

Dependency Diagram

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  54d4b321_4d14_1f1b_b941_7337c643b772["captureAssertion()"]
  3d868c1f_a0e6_ed76_347e_51c4c370a7b5["reactTestMatchers.js"]
  54d4b321_4d14_1f1b_b941_7337c643b772 -->|defined in| 3d868c1f_a0e6_ed76_347e_51c4c370a7b5
  5cb4ccde_ac4d_2440_88a3_2b9f5a5d3c26["toMatchRenderedOutput()"]
  5cb4ccde_ac4d_2440_88a3_2b9f5a5d3c26 -->|calls| 54d4b321_4d14_1f1b_b941_7337c643b772
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Relationship Graph

Source Code

scripts/jest/matchers/reactTestMatchers.js lines 7–21

function captureAssertion(fn) {
  // Trick to use a Jest matcher inside another Jest matcher. `fn` contains an
  // assertion; if it throws, we capture the error and return it, so the stack
  // trace presented to the user points to the original assertion in the
  // test file.
  try {
    fn();
  } catch (error) {
    return {
      pass: false,
      message: () => error.message,
    };
  }
  return {pass: true};
}