1 files changed, 21 insertions, 0 deletions
diff --git a/src/tools/ipv4-range-expander/ipv4-range-expander.service.test.ts b/src/tools/ipv4-range-expander/ipv4-range-expander.service.test.ts
new file mode 100644
index 0000000..66a9137
--- /dev/null
+++ b/src/tools/ipv4-range-expander/ipv4-range-expander.service.test.ts
@@ -0,0 +1,21 @@
+import { expect, describe, it } from 'vitest';
+import { calculateCidr } from './ipv4-range-expander.service';
+
+describe('ipv4RangeExpander', () => {
+  describe('when there are two valid ipv4 addresses given', () => {
+    it('should calculate valid cidr for given addresses', () => {
+      const result = calculateCidr({ startIp: '192.168.1.1', endIp: '192.168.7.255' });
+
+      expect(result).toBeDefined();
+      expect(result?.oldSize).toEqual(1791);
+      expect(result?.newSize).toEqual(2048);
+      expect(result?.newStart).toEqual('192.168.0.0');
+      expect(result?.newEnd).toEqual('192.168.7.255');
+      expect(result?.newCidr).toEqual('192.168.0.0/21');
+    });
+
+    it('should return empty result for invalid input', () => {
+      expect(calculateCidr({ startIp: '192.168.7.1', endIp: '192.168.6.255' })).not.toBeDefined();
+    });
+  });
+});