test: add test case for Fn::Sub

Author: theburningmonk

lib/deploy/stepFunctions/compileIamRole.test.js

@@ -1230,11 +1230,20 @@ describe('#compileIamRole', () => {
     // function name can be...
     const lambda1 = { Ref: 'MyFunction' }; // name
     const lambda2 = { 'Fn::GetAtt': ['MyFunction', 'Arn'] }; // Arn
+    const lambda3 = { // or, something we don't need special handling for
+      'Fn::Sub': [
+        'arn:aws:lambda:${AWS::Region}:${AWS::AccountId}:function:${FunctionName}',
+        {
+          FunctionName: 'myFunction',
+        },
+      ],
+    };
 
     serverless.service.stepFunctions = {
       stateMachines: {
         myStateMachine1: getStateMachine('sm1', lambda1),
         myStateMachine2: getStateMachine('sm2', lambda2),
+        myStateMachine3: getStateMachine('sm3', lambda3),
       },
     };
 
@@ -1260,6 +1269,14 @@ describe('#compileIamRole', () => {
           'Arn',
         ],
       },
+      {
+        'Fn::Sub': [
+          'arn:aws:lambda:${AWS::Region}:${AWS::AccountId}:function:${FunctionName}',
+          {
+            FunctionName: 'myFunction',
+          },
+        ],
+      },
     ];
     expect(lambdaPermissions[0].Resource).to.deep.eq(lambdaArns);
   });