codePositionToIndex.test.mjs

import { strictEqual, throws } from "assert";

import CodePosition from "./CodePosition.mjs";
import codePositionToIndex from "./codePositionToIndex.mjs";

export default (tests) => {
  tests.add(
    "`codePositionToIndex` with argument 1 `codePosition` not a `CodePosition` instance.",
    () => {
      throws(() => {
        codePositionToIndex(true);
      }, new TypeError("Argument 1 `codePosition` must be a `CodePosition` instance."));
    }
  );

  tests.add(
    "`codePositionToIndex` with argument 2 `code` not a string.",
    () => {
      throws(() => {
        codePositionToIndex(new CodePosition(1, 1), true);
      }, new TypeError("Argument 2 `code` must be a string."));
    }
  );

  tests.add(
    "`codePositionToIndex` with argument 2 `code` not a populated string.",
    () => {
      throws(() => {
        codePositionToIndex(new CodePosition(1, 1), "");
      }, new TypeError("Argument 2 `code` must be a populated string."));
    }
  );

  tests.add("`codePositionToIndex` with singleline code, start.", () => {
    strictEqual(codePositionToIndex(new CodePosition(1, 1), "abc"), 0);
  });

  tests.add("`codePositionToIndex` with singleline code, between.", () => {
    strictEqual(codePositionToIndex(new CodePosition(1, 2), "abc"), 1);
  });

  tests.add("`codePositionToIndex` with singleline code, end.", () => {
    strictEqual(codePositionToIndex(new CodePosition(1, 3), "abc"), 2);
  });

  tests.add("`codePositionToIndex` with multiline code, start.", () => {
    strictEqual(
      codePositionToIndex(
        new CodePosition(1, 1),
        `abc
def
hij`
      ),
      0
    );
  });

  tests.add("`codePositionToIndex` with multiline code, between.", () => {
    strictEqual(
      codePositionToIndex(
        new CodePosition(2, 2),
        `abc
def
hij`
      ),
      5
    );
  });

  tests.add("`codePositionToIndex` with multiline code, end.", () => {
    strictEqual(
      codePositionToIndex(
        new CodePosition(3, 3),
        `abc
def
hij`
      ),
      10
    );
  });
};