fix(finance.bic): remove hardcoded elements and simplify function (#1171)

3 files changed, 19 insertions, 28 deletions

diff --git a/src/modules/finance/index.ts b/src/modules/finance/index.ts
index 5d83963b..7085ea36 100644
--- a/src/modules/finance/index.ts
+++ b/src/modules/finance/index.ts
@@ -390,29 +390,25 @@ export class Finance {
   }
 
   /**
-   * Generates a random bic.
+   * Generates a random SWIFT/BIC code based on the [ISO-9362](https://en.wikipedia.org/wiki/ISO_9362) format.
    *
    * @example
    * faker.finance.bic() // 'WYAUPGX1432'
    */
   bic(): string {
-    const vowels = ['A', 'E', 'I', 'O', 'U'];
-    const prob = this.faker.datatype.number(100);
-
-    return [
-      this.faker.helpers.replaceSymbols('???'),
-      this.faker.helpers.arrayElement(vowels),
-      this.faker.helpers.arrayElement(iban.iso3166),
-      this.faker.helpers.replaceSymbols('?'),
-      '1',
-      prob < 10
-        ? this.faker.helpers.replaceSymbols(
-            `?${this.faker.helpers.arrayElement(vowels)}?`
-          )
-        : prob < 40
-        ? this.faker.helpers.replaceSymbols('###')
-        : '',
-    ].join('');
+    const bankIdentifier = this.faker.random.alpha({
+      count: 4,
+      casing: 'upper',
+    });
+    const countryCode = this.faker.helpers.arrayElement(iban.iso3166);
+    const locationCode = this.faker.random.alphaNumeric(2, { casing: 'upper' });
+    const branchCode = this.faker.datatype.boolean()
+      ? this.faker.datatype.boolean()
+        ? this.faker.random.alphaNumeric(3, { casing: 'upper' })
+        : 'XXX'
+      : '';
+
+    return `${bankIdentifier}${countryCode}${locationCode}${branchCode}`;
   }
 
   /**
diff --git a/test/__snapshots__/finance.spec.ts.snap b/test/__snapshots__/finance.spec.ts.snap
index f45679f4..1e7486db 100644
--- a/test/__snapshots__/finance.spec.ts.snap
+++ b/test/__snapshots__/finance.spec.ts.snap
@@ -16,7 +16,7 @@ exports[`finance > 42 > amount > with min 1`] = `"380.79"`;
 
 exports[`finance > 42 > amount > with min and max and dec and symbol 1`] = `"$24.98160"`;
 
-exports[`finance > 42 > bic 1`] = `"UYEOSCP1514"`;
+exports[`finance > 42 > bic 1`] = `"JUYEPSSLXXX"`;
 
 exports[`finance > 42 > bitcoinAddress 1`] = `"3XbJMAAara64sSkA9HD24YHQWd1b"`;
 
@@ -80,7 +80,7 @@ exports[`finance > 1211 > amount > with min 1`] = `"929.24"`;
 
 exports[`finance > 1211 > amount > with min and max and dec and symbol 1`] = `"$47.14081"`;
 
-exports[`finance > 1211 > bic 1`] = `"LXUEBTZ1"`;
+exports[`finance > 1211 > bic 1`] = `"YLXUDE4Z"`;
 
 exports[`finance > 1211 > bitcoinAddress 1`] = `"1TMe8Z3EaFdLqmaGKP1LEEJQVriSZRZdsA"`;
 
@@ -144,7 +144,7 @@ exports[`finance > 1337 > amount > with min 1`] = `"269.40"`;
 
 exports[`finance > 1337 > amount > with min and max and dec and symbol 1`] = `"$20.48098"`;
 
-exports[`finance > 1337 > bic 1`] = `"OEFELYL1032"`;
+exports[`finance > 1337 > bic 1`] = `"GOEFFIJG"`;
 
 exports[`finance > 1337 > bitcoinAddress 1`] = `"3adhxs2jewAgkYgJi7No6Cn8JZa"`;
 
diff --git a/test/finance.spec.ts b/test/finance.spec.ts
index b1aed4ad..afc671a7 100644
--- a/test/finance.spec.ts
+++ b/test/finance.spec.ts
@@ -482,15 +482,10 @@ describe('finance', () => {
       describe('bic()', () => {
         it('should return a random yet formally correct BIC number', () => {
           const bic = faker.finance.bic();
-          const expr = new RegExp(
-            `^[A-Z]{4}(${ibanLib.iso3166.join(
-              '|'
-            )})[A-Z2-9][A-NP-Z0-9]([A-Z0-9]{3})?\$`,
-            'i'
-          );
 
           expect(bic).toBeTypeOf('string');
-          expect(bic).toMatch(expr);
+          expect(bic).toMatch(/^[A-Z]{6}[A-Z0-9]{2}([A-Z0-9]{3})?$/);
+          expect(ibanLib.iso3166).toContain(bic.substring(4, 6));
         });
       });