Add max-parallelism to test workflow

and add more tests for isPositiveInteger
function

.github/workflows/test-workflow.yml

@@ -38,6 +38,7 @@ jobs:
           files: '**/*.txt'
           replacement-text: '1.0.2'
           exclude: '**/*.check.txt'
+          max-parallelism: '1'
 
       - name: Replace in Files - replace using special characters
         uses: ./
@@ -91,6 +92,26 @@ jobs:
           encoding: 'invalid'
           exclude: '**/*.check.txt'
 
+      - name: Replace in Files - error on invalid max-parallelism (invalid number)
+        uses: ./
+        continue-on-error: true
+        with:
+          search-text: 'foo'
+          files: '**/*.txt'
+          replacement-text: 'bar'
+          exclude: '**/*.check.txt'
+          max-parallelism: '-1'
+
+      - name: Replace in Files - error on invalid max-parallelism (invalid string)
+        uses: ./
+        continue-on-error: true
+        with:
+          search-text: 'foo'
+          files: '**/*.txt'
+          replacement-text: 'bar'
+          exclude: '**/*.check.txt'
+          max-parallelism: 'invalid'
+
       - name: Verify changes
         run: |
           echo "  > Actual - test1.txt"

__tests__/utils.test.ts

@@ -29,6 +29,22 @@ describe('isPositiveInteger', () => {
   it('should return false for non-numeric strings', () => {
     expect(isPositiveInteger('abc')).toBe(false);
   });
+
+  it('should return false for empty strings', () => {
+    expect(isPositiveInteger('')).toBe(false);
+  });
+
+  it('should return false for whitespace strings', () => {
+    expect(isPositiveInteger(' ')).toBe(false);
+  });
+
+  it('should return false for null', () => {
+    expect(isPositiveInteger(null as any)).toBe(false);
+  });
+
+  it('should return false for undefined', () => {
+    expect(isPositiveInteger(undefined as any)).toBe(false);
+  });
 });
 
 describe('isValidEncoding', () => {