chore: fix mustache type warning and add some tests (#753)

1 files changed, 44 insertions, 5 deletions

diff --git a/test/helpers.spec.ts b/test/helpers.spec.ts
index 0be83f98..cf817ae5 100644
--- a/test/helpers.spec.ts
+++ b/test/helpers.spec.ts
@@ -724,11 +724,50 @@ describe('helpers', () => {
       });
 
       describe('mustache()', () => {
-        it('returns empty string with no arguments', () => {
-          expect(
-            // @ts-expect-error
-            faker.helpers.mustache()
-          ).toBe('');
+        it('returns empty string with no template input', () => {
+          expect(faker.helpers.mustache(undefined, {})).toBe('');
+        });
+
+        it('returns empty string with empty template input', () => {
+          expect(faker.helpers.mustache('', {})).toBe('');
+        });
+
+        it('supports string replace values', () => {
+          const actual = faker.helpers.mustache('1{{value}}3', { value: '2' });
+
+          expect(actual).toBe('123');
+        });
+
+        it('supports function replace values faker values', () => {
+          const actual = faker.helpers.mustache('1{{value}}3', {
+            value: faker.datatype.string(2),
+          });
+
+          expect(actual).toHaveLength(4);
+        });
+
+        it('supports function replace values faker function', () => {
+          const actual = faker.helpers.mustache('1{{value}}3', {
+            value: () => faker.datatype.string(3),
+          });
+
+          expect(actual).toHaveLength(5);
+        });
+
+        it('supports function replace values no args', () => {
+          const actual = faker.helpers.mustache('1{{value}}3', {
+            value: () => '7',
+          });
+
+          expect(actual).toBe('173');
+        });
+
+        it('supports function replace values with args', () => {
+          const actual = faker.helpers.mustache('1{{value}}3', {
+            value: (key) => String(key.length),
+          });
+
+          expect(actual).toBe('193');
         });
       });