diff --git a/test/base-commands/twilio-client-command.test.js b/test/base-commands/twilio-client-command.test.js
index 33660254..89c809ec 100644
--- a/test/base-commands/twilio-client-command.test.js
+++ b/test/base-commands/twilio-client-command.test.js
@@ -341,6 +341,32 @@ describe('base-commands', () => {
         expect(ctx.testCmd.twilioApiClient.edge).to.equal('dublin');
         expect(ctx.testCmd.twilioApiClient.region).to.equal('ie1');
       });
+
+      setUpTest(['-l', 'debug'], { configEdge: 'custom-edge', envRegion: 'ie1' }).it(
+        'should warn when both edge and region are set',
+        (ctx) => {
+          // Access twilioApiClient first to trigger buildClient
+          expect(ctx.testCmd.twilioApiClient.edge).to.equal('custom-edge');
+          expect(ctx.testCmd.twilioApiClient.region).to.equal('ie1');
+          // Now check for the warning
+          expect(ctx.stderr).to.contain('Deprecation Warning');
+          expect(ctx.stderr).to.contain('For regional processing, DNS is of format product.edge.region.twilio.com');
+        },
+      );
+
+      setUpTest(['-l', 'debug'], { envRegion: 'ie1' }).it('should warn when setting default edge for region', (ctx) => {
+        // Access twilioApiClient first to trigger buildClient
+        expect(ctx.testCmd.twilioApiClient.edge).to.equal('dublin');
+        expect(ctx.testCmd.twilioApiClient.region).to.equal('ie1');
+        // Now check for the warning
+        expect(ctx.stderr).to.contain('Deprecation Warning');
+        expect(ctx.stderr).to.contain('Setting default `edge` for provided `region`');
+      });
+
+      setUpTest([], { envRegion: 'unknown-region' }).it('should not set edge for unmapped region', (ctx) => {
+        expect(ctx.testCmd.twilioApiClient.edge).to.be.undefined;
+        expect(ctx.testCmd.twilioApiClient.region).to.equal('unknown-region');
+      });
     });
   });
 });