42 lines
977 B
TypeScript
42 lines
977 B
TypeScript
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import { describe, expect, it } from "vitest"
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import { capitalize } from "../strings.js"
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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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