fix: Fix handling of maxInstances setting (#199)

Author: holmerjohn

package/lib/compileFunctions.js

@@ -55,7 +55,9 @@ module.exports = {
         });
       }
 
-      funcTemplate.properties.maxInstances = funcObject.maxInstances;
+      if (funcObject.maxInstances) {
+        funcTemplate.properties.maxInstances = funcObject.maxInstances;
+      }
 
       if (!_.size(funcTemplate.properties.environmentVariables)) {
         delete funcTemplate.properties.environmentVariables;

package/lib/compileFunctions.test.js

@@ -683,5 +683,70 @@ describe('CompileFunctions', () => {
         ).toEqual(compiledResources);
       });
     });
+
+    it('should not require max instances on each function configuration', () => {
+      googlePackage.serverless.service.functions = {
+        func1: {
+          handler: 'func1',
+          memorySize: 128,
+          runtime: 'nodejs8',
+          vpc: 'projects/pg-us-n-app-123456/locations/us-central1/connectors/my-vpc',
+          events: [{ http: 'foo' }],
+        },
+        func2: {
+          handler: 'func2',
+          memorySize: 128,
+          runtime: 'nodejs8',
+          maxInstances: 10,
+          vpc: 'projects/pg-us-n-app-123456/locations/us-central1/connectors/my-vpc',
+          events: [{ http: 'bar' }],
+        },
+      };
+
+      const compiledResources = [
+        {
+          type: 'cloudfunctions.v1beta2.function',
+          name: 'my-service-dev-func1',
+          properties: {
+            location: 'us-central1',
+            runtime: 'nodejs8',
+            function: 'func1',
+            availableMemoryMb: 128,
+            timeout: '60s',
+            sourceArchiveUrl: 'gs://sls-my-service-dev-12345678/some-path/artifact.zip',
+            httpsTrigger: {
+              url: 'foo',
+            },
+            labels: {},
+            vpcConnector: 'projects/pg-us-n-app-123456/locations/us-central1/connectors/my-vpc',
+          },
+        },
+        {
+          type: 'cloudfunctions.v1beta2.function',
+          name: 'my-service-dev-func2',
+          properties: {
+            location: 'us-central1',
+            runtime: 'nodejs8',
+            function: 'func2',
+            availableMemoryMb: 128,
+            timeout: '60s',
+            maxInstances: 10,
+            sourceArchiveUrl: 'gs://sls-my-service-dev-12345678/some-path/artifact.zip',
+            httpsTrigger: {
+              url: 'bar',
+            },
+            labels: {},
+            vpcConnector: 'projects/pg-us-n-app-123456/locations/us-central1/connectors/my-vpc',
+          },
+        },
+      ];
+
+      return googlePackage.compileFunctions().then(() => {
+        expect(consoleLogStub.called).toEqual(true);
+        expect(
+          googlePackage.serverless.service.provider.compiledConfigurationTemplate.resources
+        ).toEqual(compiledResources);
+      });
+    });
   });
 });