add acceptance test and update documentation

aws/resource_aws_secretsmanager_secret.go

@@ -39,12 +39,14 @@ func resourceAwsSecretsManagerSecret() *schema.Resource {
 			"name": {
 				Type:          schema.TypeString,
 				Optional:      true,
+				Computed:      true,
 				ForceNew:      true,
 				ConflictsWith: []string{"name_prefix"},
 			},
 			"name_prefix": {
 				Type:          schema.TypeString,
 				Optional:      true,
+				Computed:      true,
 				ForceNew:      true,
 				ConflictsWith: []string{"name"},
 			},

aws/resource_aws_secretsmanager_secret_test.go

@@ -103,6 +103,34 @@ func TestAccAwsSecretsManagerSecret_Basic(t *testing.T) {
 	})
 }
 
+func TestAccAwsSecretsManagerSecret_withNamePrefix(t *testing.T) {
+	var secret secretsmanager.DescribeSecretOutput
+	rName := "tf-acc-test-"
+	resourceName := "aws_secretsmanager_secret.test"
+
+	resource.ParallelTest(t, resource.TestCase{
+		PreCheck:     func() { testAccPreCheck(t) },
+		Providers:    testAccProviders,
+		CheckDestroy: testAccCheckAwsSecretsManagerSecretDestroy,
+		Steps: []resource.TestStep{
+			{
+				Config: testAccAwsSecretsManagerSecretConfig_withNamePrefix(rName),
+				Check: resource.ComposeTestCheckFunc(
+					testAccCheckAwsSecretsManagerSecretExists(resourceName, &secret),
+					resource.TestMatchResourceAttr(resourceName, "arn", regexp.MustCompile(fmt.Sprintf("^arn:[^:]+:secretsmanager:[^:]+:[^:]+:secret:%s.+$", rName))),
+					resource.TestMatchResourceAttr(resourceName, "name", regexp.MustCompile(fmt.Sprintf("^%s", rName))),
+				),
+			},
+			{
+				ResourceName:            resourceName,
+				ImportState:             true,
+				ImportStateVerify:       true,
+				ImportStateVerifyIgnore: []string{"recovery_window_in_days", "name_prefix"},
+			},
+		},
+	})
+}
+
 func TestAccAwsSecretsManagerSecret_Description(t *testing.T) {
 	var secret secretsmanager.DescribeSecretOutput
 	rName := acctest.RandomWithPrefix("tf-acc-test")
@@ -495,6 +523,14 @@ resource "aws_secretsmanager_secret" "test" {
 `, rName)
 }
 
+func testAccAwsSecretsManagerSecretConfig_withNamePrefix(rName string) string {
+	return fmt.Sprintf(`
+resource "aws_secretsmanager_secret" "test" {
+  name_prefix = "%s"
+}
+`, rName)
+}
+
 func testAccAwsSecretsManagerSecretConfig_KmsKeyID(rName string) string {
 	return fmt.Sprintf(`
 resource "aws_kms_key" "test1" {

website/docs/r/secretsmanager_secret.html.markdown

@@ -43,7 +43,8 @@ resource "aws_secretsmanager_secret" "rotation-example" {
 
 The following arguments are supported:
 
-* `name` - (Required) Specifies the friendly name of the new secret. The secret name can consist of uppercase letters, lowercase letters, digits, and any of the following characters: `/_+=.@-` Spaces are not permitted.
+* `name` - (Optional) Specifies the friendly name of the new secret. The secret name can consist of uppercase letters, lowercase letters, digits, and any of the following characters: `/_+=.@-` Conflicts with `name_prefix`.
+* `name_prefix` - (Optional) Creates a unique name beginning with the specified prefix. Conflicts with `name`.
 * `description` - (Optional) A description of the secret.
 * `kms_key_id` - (Optional) Specifies the ARN or alias of the AWS KMS customer master key (CMK) to be used to encrypt the secret values in the versions stored in this secret. If you don't specify this value, then Secrets Manager defaults to using the AWS account's default CMK (the one named `aws/secretsmanager`). If the default KMS CMK with that name doesn't yet exist, then AWS Secrets Manager creates it for you automatically the first time.
 * `policy` - (Optional) A valid JSON document representing a [resource policy](https://docs.aws.amazon.com/secretsmanager/latest/userguide/auth-and-access_resource-based-policies.html). For more information about building AWS IAM policy documents with Terraform, see the [AWS IAM Policy Document Guide](/docs/providers/aws/guides/iam-policy-documents.html).