150 lines
3.9 KiB
TypeScript
150 lines
3.9 KiB
TypeScript
import { describe, expect, it } from "vitest"
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import { capitalize, reduceConsecutiveCharacters, trimAny } from "../strings.ts"
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describe("capitalize", () => {
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it("should capitalize the first letter of a string", () => {
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// Arrange - Given
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const input = "hello, world!"
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// Act - When
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const output = capitalize(input)
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// Assert - Then
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const expected = "Hello, world!"
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expect(output).toEqual(expected)
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})
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it("should return an empty string when the input is an empty string", () => {
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// Arrange - Given
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const input = ""
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// Act - When
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const output = capitalize(input)
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// Assert - Then
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const expected = ""
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expect(output).toEqual(expected)
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})
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it("should return the same string when the first letter is already capitalized", () => {
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// Arrange - Given
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const input = "Hello, world!"
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// Act - When
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const output = capitalize(input)
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// Assert - Then
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const expected = "Hello, world!"
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expect(output).toEqual(expected)
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})
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})
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describe("trimAny", () => {
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it("should trim any of the specified characters from the start and end of a string", () => {
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// Arrange - Given
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const input = "_____foo bar "
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const characters = [" ", "_"]
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// Act - When
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const output = trimAny(input, characters)
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// Assert - Then
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const expected = "foo bar"
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expect(output).toEqual(expected)
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})
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it("should trim any of the specified characters from the start and end of a string even if the start and end characters are different", () => {
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// Arrange - Given
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const input = "_ __ _foo bar _"
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const characters = [" ", "_"]
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// Act - When
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const output = trimAny(input, characters)
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// Assert - Then
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const expected = "foo bar"
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expect(output).toEqual(expected)
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})
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it("should return the same string when the input does not start or end with any of the specified characters", () => {
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// Arrange - Given
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const input = "foo bar"
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const characters = [" ", "_"]
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// Act - When
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const output = trimAny(input, characters)
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// Assert - Then
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const expected = "foo bar"
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expect(output).toEqual(expected)
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})
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it("should return an empty string when the input is an empty string", () => {
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// Arrange - Given
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const input = ""
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const characters = [" ", "_"]
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// Act - When
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const output = trimAny(input, characters)
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// Assert - Then
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const expected = ""
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expect(output).toEqual(expected)
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})
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it("should return an empty string when the input starts and ends with the specified characters", () => {
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// Arrange - Given
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const input = " _ "
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const characters = [" ", "_"]
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// Act - When
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const output = trimAny(input, characters)
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// Assert - Then
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const expected = ""
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expect(output).toEqual(expected)
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})
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})
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describe("reduceConsecutiveCharacters", () => {
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it("should reduce consecutive occurrences of specified characters in a string to a single occurrence", () => {
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// Arrange - Given
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const input = "Hello___there!!"
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const characters = ["_", "!"]
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// Act - When
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const output = reduceConsecutiveCharacters(input, characters)
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// Assert - Then
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const expected = "Hello_there!"
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expect(output).toEqual(expected)
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})
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it("should return the same string when there are no consecutive occurrences of specified characters", () => {
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// Arrange - Given
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const input = "Hello there!"
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const characters = ["_", "!"]
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// Act - When
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const output = reduceConsecutiveCharacters(input, characters)
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// Assert - Then
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const expected = "Hello there!"
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expect(output).toEqual(expected)
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})
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it("should return an empty string when the input is an empty string", () => {
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// Arrange - Given
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const input = ""
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const characters = ["_", "!"]
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// Act - When
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const output = reduceConsecutiveCharacters(input, characters)
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// Assert - Then
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const expected = ""
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expect(output).toEqual(expected)
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})
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})
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