fix: normalize provider in finance.creditCardNumber (#662)

Author: Shinigami92

src/finance.ts

@@ -249,7 +249,7 @@ export class Finance {
   /**
    * Generates a random credit card number.
    *
-   * @param provider The (lowercase) name of the provider or the format used to generate one.
+   * @param provider The name of the provider (case insensitive) or the format used to generate one.
    *
    * @example
    * faker.finance.creditCardNumber() // '4427163488668'
@@ -259,8 +259,9 @@ export class Finance {
   creditCardNumber(provider = ''): string {
     let format: string;
     const localeFormat = this.faker.definitions.finance.credit_card;
-    if (provider in localeFormat) {
-      format = this.faker.random.arrayElement(localeFormat[provider]);
+    const normalizedProvider = provider.toLowerCase();
+    if (normalizedProvider in localeFormat) {
+      format = this.faker.random.arrayElement(localeFormat[normalizedProvider]);
     } else if (provider.match(/#/)) {
       // The user chose an optional scheme
       format = provider;

test/finance.spec.ts

@@ -384,6 +384,18 @@ describe('finance', () => {
           expect(luhnCheck(faker.finance.creditCardNumber())).toBeTruthy();
         });
 
+        it('should ignore case for provider', () => {
+          const seed = faker.seedValue;
+
+          faker.seed(seed);
+          const actualNonLowerCase = faker.finance.creditCardNumber('ViSa');
+
+          faker.seed(seed);
+          const actualLowerCase = faker.finance.creditCardNumber('visa');
+
+          expect(actualNonLowerCase).toBe(actualLowerCase);
+        });
+
         it('should return a correct credit card number when issuer provided', () => {
           //TODO: implement checks for each format with regexp
           const visa = faker.finance.creditCardNumber('visa');
@@ -417,7 +429,7 @@ describe('finance', () => {
           expect(luhnCheck(instapayment)).toBeTruthy();
         });
 
-        it('should return custom formated strings', () => {
+        it('should return custom formatted strings', () => {
           let number = faker.finance.creditCardNumber('###-###-##L');
           expect(number).match(/^\d{3}\-\d{3}\-\d{3}$/);
           expect(luhnCheck(number)).toBeTruthy();