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getArrayElementSatisfiesThePredicateIfSuchElementIsExactlyOne.test.ts
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getArrayElementSatisfiesThePredicateIfSuchElementIsExactlyOne.test.ts
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import {
UnexpectedEventError,
getArrayElementSatisfiesThePredicateIfSuchElementIsExactlyOne
} from "../../../Source";
import Assert from "assert";
describe("getArrayElementSatisfiesThePredicateIfSuchElementIsExactlyOne", (): void => {
const sample: Array<string> = [ "Saint Paul", "Santa Barbara", "St. Louis", "Santa Monica" ];
it("One match", (): void => {
Assert.strictEqual(
getArrayElementSatisfiesThePredicateIfSuchElementIsExactlyOne(
sample, (arrayElement: string): boolean => arrayElement.startsWith("St.")
),
"St. Louis"
);
});
it("More than one match", (): void => {
Assert.strictEqual(
getArrayElementSatisfiesThePredicateIfSuchElementIsExactlyOne(
sample, (arrayElement: string): boolean => arrayElement.startsWith("Santa")
),
null
);
Assert.throws(
(): void => {
getArrayElementSatisfiesThePredicateIfSuchElementIsExactlyOne(
sample,
(arrayElement: string): boolean => arrayElement.startsWith("Santa"),
{ mustThrowErrorIfElementNotFoundOrMoreThan1: true }
);
},
UnexpectedEventError
);
});
it("No matches", (): void => {
Assert.strictEqual(
getArrayElementSatisfiesThePredicateIfSuchElementIsExactlyOne(
sample, (arrayElement: string): boolean => arrayElement.startsWith("Las")
),
null
);
Assert.throws(
(): void => {
getArrayElementSatisfiesThePredicateIfSuchElementIsExactlyOne(
sample,
(arrayElement: string): boolean => arrayElement.startsWith("Santa"),
{ mustThrowErrorIfElementNotFoundOrMoreThan1: true }
);
},
UnexpectedEventError
);
});
});