yoastseo-dep/spec/languageProcessing/helpers/morphology/regexHelpersSpec.js

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import {
	doesWordMatchRegex,
	searchAndReplaceWithRegex,
	applyAllReplacements,
} from "../../../../src/languageProcessing/helpers/morphology/regexHelpers";

describe( "A test to return a regex match", () => {
	it( "Returns true if there is a match", () => {
		expect( doesWordMatchRegex( "balletje", "etje$" ) ).toEqual( true );
	} );

	it( "Returns false if there is no match", () => {
		expect( doesWordMatchRegex( "ball", "etje$" ) ).toEqual( false );
	} );
} );

describe( "A test to apply multiple suffixes to a stem (stops after first match is found)", () => {
	it( "Apply the replacement if a match is found", () => {
		expect( searchAndReplaceWithRegex( "balletje", [ [ "(et)(je)$", "$1" ], [ "(nn)(en)$", "$1" ] ] ) ).toEqual( "ballet" );
	} );

	it( "Stops after the first match is found", () => {
		expect( searchAndReplaceWithRegex( "abc", [ [ "a", "x" ], [ "c", "z" ] ] ) ).toEqual( "xbc" );
	} );

	it( "Returns undefined if no match is found", () => {
		expect( searchAndReplaceWithRegex( "abc", [ [ "d", "x" ], [ "e", "z" ] ] ) ).toBeUndefined();
	} );

	it( "Returns undefined if the word is empty", () => {
		expect( searchAndReplaceWithRegex( "", [ [ "d", "x" ], [ "e", "z" ] ] ) ).toBeUndefined();
	} );
} );

describe( "A test to cumulatively apply multiple replacements", () => {
	it( "Cumulatively applies multiple changes to a word", () => {
		expect( applyAllReplacements( "abc", [ [ "a", "x" ], [ "c", "z" ] ] ) ).toEqual( "xbz" );
	} );

	it( "Returns the original word if no match is found", () => {
		expect( applyAllReplacements( "abc", [ [ "d", "x" ], [ "e", "z" ] ] ) ).toEqual( "abc" );
	} );
} );