r/instance: Function for availability zone config

aws/resource_aws_instance_test.go

@@ -3280,6 +3280,19 @@ data "aws_availability_zones" "available" {
 `, strings.Join(excludeZoneIds, "\", \""))
 }
 
+func testAccAvailableAZsNoOptInConfig() string {
+	return `
+data "aws_availability_zones" "available" {
+  state = "available"
+
+  filter {
+    name   = "opt-in-status"
+    values = ["opt-in-not-required"]
+  }
+}
+`
+}
+
 func testAccInstanceConfigInDefaultVpcBySgName(rName string) string {
 	return testAccAvailableAZsNoOptInDefaultExcludeConfig() +
 		testAccLatestAmazonLinuxHvmEbsAmiConfig() +
@@ -4886,16 +4899,7 @@ resource "aws_subnet" "test" {
 }
 
 func testAccAwsInstanceVpcConfigBasic(rName string) string {
-	return fmt.Sprintf(`
-data "aws_availability_zones" "available" {
-  state            = "available"
-
-  filter {
-    name   = "opt-in-status"
-    values = ["opt-in-not-required"]
-  }
-}
-
+	return composeConfig(testAccAvailableAZsNoOptInConfig(), fmt.Sprintf(`
 resource "aws_vpc" "test" {
   cidr_block = "10.0.0.0/16"
 
@@ -4913,7 +4917,7 @@ resource "aws_subnet" "test" {
     Name = %[1]q
   }
 }
-`, rName)
+`, rName))
 }
 
 // testAccAwsInstanceVpcSecurityGroupConfig returns the configuration for tests that create

docs/contributing/running-and-writing-acceptance-tests.md

@@ -1012,18 +1012,25 @@ The below are location-based items that _may_ be noted during review and are rec
   }
   ```
 
-- [ ] __Uses aws_availability_zones Data Source__: Any hardcoded AWS Availability Zone configuration, e.g. `us-west-2a`, should be replaced with the [`aws_availability_zones` data source](https://www.terraform.io/docs/providers/aws/d/availability_zones.html). A common pattern is declaring `data "aws_availability_zones" "available" {...}` and referencing it via `data.aws_availability_zones.available.names[0]` or `data.aws_availability_zones.available.names[count.index]` in resources utilizing `count`.
+- [ ] __Uses aws_availability_zones Data Source__: Any hardcoded AWS Availability Zone configuration, e.g. `us-west-2a`, should be replaced with the [`aws_availability_zones` data source](https://www.terraform.io/docs/providers/aws/d/availability_zones.html). Use the convenience function called `testAccAvailableAZsNoOptInConfig()` (defined in `resource_aws_instance_test.go`) to declare `data "aws_availability_zones" "available" {...}`. You can then reference the data source via `data.aws_availability_zones.available.names[0]` or `data.aws_availability_zones.available.names[count.index]` in resources utilizing `count`.
 
-  ```hcl
-  data "aws_availability_zones" "available" {
-    state = "available"
+Here's an example of using `testAccAvailableAZsNoOptInConfig()` and `data.aws_availability_zones.available.names[0]`:
 
-    filter {
-      name   = "opt-in-status"
-      values = ["opt-in-not-required"]
-    }
+```go
+func testAccAwsInstanceVpcConfigBasic(rName string) string {
+	return testAccAvailableAZsNoOptInConfig() + fmt.Sprintf(`
+resource "aws_subnet" "test" {
+  availability_zone       = data.aws_availability_zones.available.names[0]
+  cidr_block              = "10.0.0.0/24"
+  vpc_id                  = aws_vpc.test.id
+
+  tags = {
+    Name = %[1]q
   }
-  ```
+}
+`, rName)
+}
+```
 
 - [ ] __Uses aws_region Data Source__: Any hardcoded AWS Region configuration, e.g. `us-west-2`, should be replaced with the [`aws_region` data source](https://www.terraform.io/docs/providers/aws/d/region.html). A common pattern is declaring `data "aws_region" "current" {}` and referencing it via `data.aws_region.current.name`
 - [ ] __Uses aws_partition Data Source__: Any hardcoded AWS Partition configuration, e.g. the `aws` in a `arn:aws:SERVICE:REGION:ACCOUNT:RESOURCE` ARN, should be replaced with the [`aws_partition` data source](https://www.terraform.io/docs/providers/aws/d/partition.html). A common pattern is declaring `data "aws_partition" "current" {}` and referencing it via `data.aws_partition.current.partition`