remove test-related special casing

builder/amazon/chroot/builder_test.go

@@ -11,6 +11,8 @@ func testConfig() map[string]interface{} {
 		"ami_name":   "foo",
 		"source_ami": "foo",
 		"region":     "us-east-1",
+		// region validation logic is checked in ami_config_test
+		"skip_region_validation": true,
 	}
 }
 

builder/amazon/common/access_config.go

@@ -148,7 +148,8 @@ func (c *AccessConfig) Prepare(ctx *interpolate.Context) []error {
 	}
 
 	if c.RawRegion != "" && !c.SkipValidation {
-		if valid := ValidateRegion(c.RawRegion); !valid {
+		ec2conn := getValidationSession()
+		if valid := ValidateRegion(c.RawRegion, ec2conn); !valid {
 			errs = append(errs, fmt.Errorf("Unknown region: %s", c.RawRegion))
 		}
 	}

builder/amazon/common/access_config_test.go

@@ -13,33 +13,40 @@ func testAccessConfig() *AccessConfig {
 
 func TestAccessConfigPrepare_Region(t *testing.T) {
 	c := testAccessConfig()
-	c.RawRegion = ""
-	if err := c.Prepare(nil); err != nil {
-		t.Fatalf("shouldn't have err: %s", err)
-	}
+
+	mockConn := &mockEC2Client{}
 
 	c.RawRegion = "us-east-12"
-	if err := c.Prepare(nil); err == nil {
-		t.Fatal("should have error")
+	valid := ValidateRegion(c.RawRegion, mockConn)
+	if valid {
+		t.Fatalf("should have region validation err: %s", c.RawRegion)
 	}
 
 	c.RawRegion = "us-east-1"
-	if err := c.Prepare(nil); err != nil {
-		t.Fatalf("shouldn't have err: %s", err)
+	valid = ValidateRegion(c.RawRegion, mockConn)
+	if !valid {
+		t.Fatalf("shouldn't have region validation err: %s", c.RawRegion)
 	}
 
 	c.RawRegion = "custom"
-	if err := c.Prepare(nil); err == nil {
-		t.Fatalf("should have err")
+	valid = ValidateRegion(c.RawRegion, mockConn)
+	if valid {
+		t.Fatalf("should have region validation err: %s", c.RawRegion)
 	}
 
 	c.RawRegion = "custom"
 	c.SkipValidation = true
+	// testing whole prepare func here; this is checking that validation is
+	// skipped, so we don't need a mock connection
 	if err := c.Prepare(nil); err != nil {
 		t.Fatalf("shouldn't have err: %s", err)
 	}
-	c.SkipValidation = false
 
+	c.SkipValidation = false
+	c.RawRegion = ""
+	if err := c.Prepare(nil); err != nil {
+		t.Fatalf("shouldn't have err: %s", err)
+	}
 }
 
 func TestAccessConfigPrepare_RegionRestricted(t *testing.T) {

builder/amazon/common/ami_config.go

@@ -71,7 +71,7 @@ func (c *AMIConfig) Prepare(accessConfig *AccessConfig, ctx *interpolate.Context
 
 			if !c.AMISkipRegionValidation {
 				// Verify the region is real
-				if valid := ValidateRegion(region); !valid {
+				if valid := ValidateRegion(region, getValidationSession()); !valid {
 					errs = append(errs, fmt.Errorf("Unknown region: %s", region))
 				}
 			}

builder/amazon/common/ami_config_test.go

@@ -3,6 +3,9 @@ package common
 import (
 	"reflect"
 	"testing"
+
+	"github.com/aws/aws-sdk-go/service/ec2"
+	"github.com/aws/aws-sdk-go/service/ec2/ec2iface"
 )
 
 func testAMIConfig() *AMIConfig {
@@ -29,6 +32,19 @@ func TestAMIConfigPrepare_name(t *testing.T) {
 	}
 }
 
+type mockEC2Client struct {
+	ec2iface.EC2API
+}
+
+func (m *mockEC2Client) DescribeRegions(*ec2.DescribeRegionsInput) (*ec2.DescribeRegionsOutput, error) {
+	// Describes a region.
+	regionString := "us-east-1"
+	reg := ec2.Region{RegionName: &regionString}
+	return &ec2.DescribeRegionsOutput{
+		Regions: []*ec2.Region{&reg},
+	}, nil
+}
+
 func TestAMIConfigPrepare_regions(t *testing.T) {
 	c := testAMIConfig()
 	c.AMIRegions = nil
@@ -36,7 +52,8 @@ func TestAMIConfigPrepare_regions(t *testing.T) {
 		t.Fatalf("shouldn't have err: %s", err)
 	}
 
-	c.AMIRegions = listEC2Regions()
+	mockConn := &mockEC2Client{}
+	c.AMIRegions = listEC2Regions(mockConn)
 	if err := c.Prepare(nil, nil); err != nil {
 		t.Fatalf("shouldn't have err: %s", err)
 	}

builder/amazon/common/regions.go

@@ -1,19 +1,22 @@
 package common
 
 import (
-	"flag"
-
 	"github.com/aws/aws-sdk-go/aws/session"
 	"github.com/aws/aws-sdk-go/service/ec2"
+	"github.com/aws/aws-sdk-go/service/ec2/ec2iface"
 )
 
-func listEC2Regions() []string {
-	var regions []string
+func getValidationSession() *ec2.EC2 {
 	sess := session.Must(session.NewSessionWithOptions(session.Options{
 		SharedConfigState: session.SharedConfigEnable,
 	}))
 
 	ec2conn := ec2.New(sess)
+	return ec2conn
+}
+
+func listEC2Regions(ec2conn ec2iface.EC2API) []string {
+	var regions []string
 	resultRegions, _ := ec2conn.DescribeRegions(nil)
 	for _, region := range resultRegions.Regions {
 		regions = append(regions, *region.RegionName)
@@ -24,24 +27,8 @@ func listEC2Regions() []string {
 
 // ValidateRegion returns true if the supplied region is a valid AWS
 // region and false if it's not.
-func ValidateRegion(region string) bool {
-
-	// To pass tests
-	if v := flag.Lookup("test.v"); v != nil || v.Value.String() == "true" {
-		regions := []string{
-			"us-east-1",
-			"us-east-2",
-			"us-west-1",
-		}
-		for _, valid := range regions {
-			if region == valid {
-				return true
-			}
-		}
-	}
-
-	// Normal run
-	for _, valid := range listEC2Regions() {
+func ValidateRegion(region string, ec2conn ec2iface.EC2API) bool {
+	for _, valid := range listEC2Regions(ec2conn) {
 		if region == valid {
 			return true
 		}

vendor/vendor.json

@@ -531,6 +531,14 @@
 			"version": "v1.12.72",
 			"versionExact": "v1.12.72"
 		},
+		{
+			"checksumSHA1": "u+wyWp/GWHHINKLeXP0eQmbfQ38=",
+			"path": "github.com/aws/aws-sdk-go/service/ec2/ec2iface",
+			"revision": "586c9ba6027a527800564282bb843d7e6e7985c9",
+			"revisionTime": "2018-02-07T00:16:19Z",
+			"version": "v1.12.72",
+			"versionExact": "v1.12.72"
+		},
 		{
 			"checksumSHA1": "kEgV0dSAj3M3M1waEkC27JS7VnU=",
 			"comment": "v1.7.1",
@@ -1005,12 +1013,6 @@
 			"revision": "0fb14efe8c47ae851c0034ed7a448854d3d34cf3",
 			"revisionTime": "2018-02-01T23:52:37Z"
 		},
-		{
-			"checksumSHA1": "0PeWsO2aI+2PgVYlYlDPKfzCLEQ=",
-			"path": "github.com/hashicorp/serf/coordinate",
-			"revision": "984a73625de3138f44deb38d00878fab39eb6447",
-			"revisionTime": "2018-05-30T15:59:58Z"
-		},
 		{
 			"checksumSHA1": "HtpYAWHvd9mq+mHkpo7z8PGzMik=",
 			"path": "github.com/hashicorp/hcl",
@@ -1065,6 +1067,12 @@
 			"revision": "ef8a98b0bbce4a65b5aa4c368430a80ddc533168",
 			"revisionTime": "2018-04-04T17:41:02Z"
 		},
+		{
+			"checksumSHA1": "0PeWsO2aI+2PgVYlYlDPKfzCLEQ=",
+			"path": "github.com/hashicorp/serf/coordinate",
+			"revision": "984a73625de3138f44deb38d00878fab39eb6447",
+			"revisionTime": "2018-05-30T15:59:58Z"
+		},
 		{
 			"checksumSHA1": "oi8fnfAPPTf2nN7zptlyu/EsMMs=",
 			"path": "github.com/hashicorp/vault/api",