diff --git a/hcl2template/types.required_plugins_test.go b/hcl2template/types.required_plugins_test.go
index d487210ba..650f51a47 100644
--- a/hcl2template/types.required_plugins_test.go
+++ b/hcl2template/types.required_plugins_test.go
@@ -4,182 +4,71 @@ import (
 	"testing"
 
 	"github.com/google/go-cmp/cmp"
-	"github.com/google/go-cmp/cmp/cmpopts"
-	"github.com/hashicorp/hcl/v2"
+	"github.com/hashicorp/go-version"
 	"github.com/hashicorp/packer/hcl2template/addrs"
 )
 
-func TestPackerConfig_decodeImplicitRequiredPluginsBlocks(t *testing.T) {
-	type fields struct {
-		PackerConfig
-	}
-	type args struct {
-		block *hcl.Block
-	}
+func TestPackerConfig_required_plugin_parse(t *testing.T) {
+	defaultParser := getBasicParser()
+
 	tests := []struct {
-		name       string
-		fields     fields
-		args       args
-		wantDiags  bool
-		wantConfig PackerConfig
+		name           string
+		cfg            PackerConfig
+		requirePlugins string
+		restOfTemplate string
+		wantDiags      bool
+		wantConfig     PackerConfig
 	}{
-		{"invalid block", fields{PackerConfig: PackerConfig{}}, args{block: &hcl.Block{}}, false, PackerConfig{}},
-		{"invalid block name", fields{PackerConfig: PackerConfig{}}, args{block: &hcl.Block{Labels: []string{""}}}, false, PackerConfig{}},
-		{"implicitly require amazon plugin through datasource",
-			fields{PackerConfig: PackerConfig{}},
-			args{block: &hcl.Block{Labels: []string{"amazon-ami"}}},
-			false,
-			PackerConfig{
-				Packer: struct {
-					VersionConstraints []VersionConstraint
-					RequiredPlugins    []*RequiredPlugins
-				}{
-					RequiredPlugins: []*RequiredPlugins{
-						{
-							RequiredPlugins: map[string]*RequiredPlugin{
-								"amazon": {
-									Name:                   "amazon",
-									Source:                 "github.com/hashicorp/amazon",
-									Type:                   &addrs.Plugin{"github.com", "hashicorp", "amazon"},
-									PluginDependencyReason: PluginDependencyImplicit,
-								},
-							},
-						},
-					},
-				},
-			}},
-		{"don't replace explicitly imported amazon plugin",
-			fields{PackerConfig: PackerConfig{
-				Packer: struct {
-					VersionConstraints []VersionConstraint
-					RequiredPlugins    []*RequiredPlugins
-				}{
-					RequiredPlugins: []*RequiredPlugins{
-						{
-							RequiredPlugins: map[string]*RequiredPlugin{
-								"amazon": {
-									Name:                   "amazon",
-									Source:                 "github.com/hashicorp/amazon",
-									Type:                   &addrs.Plugin{"github.com", "hashicorp", "amazon"},
-									PluginDependencyReason: PluginDependencyExplicit,
-								},
-							},
-						},
-					},
-				},
-			}},
-			args{block: &hcl.Block{Labels: []string{"amazon-ami"}}},
-			false,
-			PackerConfig{
-				Packer: struct {
-					VersionConstraints []VersionConstraint
-					RequiredPlugins    []*RequiredPlugins
-				}{
-					RequiredPlugins: []*RequiredPlugins{
-						{
-							RequiredPlugins: map[string]*RequiredPlugin{
-								"amazon": {
-									Name:                   "amazon",
-									Source:                 "github.com/hashicorp/amazon",
-									Type:                   &addrs.Plugin{"github.com", "hashicorp", "amazon"},
-									PluginDependencyReason: PluginDependencyExplicit,
-								},
-							},
-						},
-					},
-				},
-			}},
-		{"implict import of a plugin without a dash",
-			fields{PackerConfig: PackerConfig{}},
-			args{block: &hcl.Block{Labels: []string{"google"}}},
-			false,
-			PackerConfig{
-				Packer: struct {
-					VersionConstraints []VersionConstraint
-					RequiredPlugins    []*RequiredPlugins
-				}{
-					RequiredPlugins: []*RequiredPlugins{
-						{
-							RequiredPlugins: map[string]*RequiredPlugin{
-								"google": {
-									Name:                   "google",
-									Source:                 "github.com/hashicorp/google",
-									Type:                   &addrs.Plugin{"github.com", "hashicorp", "google"},
-									PluginDependencyReason: PluginDependencyImplicit,
-								},
-							},
-						},
-					},
-				},
-			}},
-		{"ignore already imported google plugin",
-			fields{PackerConfig: PackerConfig{
-				Packer: struct {
-					VersionConstraints []VersionConstraint
-					RequiredPlugins    []*RequiredPlugins
-				}{
-					RequiredPlugins: []*RequiredPlugins{
-						{
-							RequiredPlugins: map[string]*RequiredPlugin{
-								"google": {
-									Name:                   "google",
-									Source:                 "github.com/hashicorp/google",
-									Type:                   &addrs.Plugin{"github.com", "hashicorp", "google"},
-									PluginDependencyReason: PluginDependencyExplicit,
-								},
-							},
-						},
-					},
-				},
-			}},
-			args{block: &hcl.Block{Labels: []string{"google"}}},
-			false,
-			PackerConfig{
-				Packer: struct {
-					VersionConstraints []VersionConstraint
-					RequiredPlugins    []*RequiredPlugins
-				}{
-					RequiredPlugins: []*RequiredPlugins{
-						{
-							RequiredPlugins: map[string]*RequiredPlugin{
-								"google": {
-									Name:                   "google",
-									Source:                 "github.com/hashicorp/google",
-									Type:                   &addrs.Plugin{"github.com", "hashicorp", "google"},
-									PluginDependencyReason: PluginDependencyExplicit,
-								},
+		// {"empty source labels", PackerConfig{parser: defaultParser}, ``, `source "" "" {}`, false, PackerConfig{}},
+		{"add required_plugin", PackerConfig{parser: defaultParser}, `
+		packer {
+			required_plugins {
+				amazon = {
+					source  = "github.com/hashicorp/amazon"
+					version = "~> v1.2.3"
+				}
+			}
+		}
+		`, ``, false, PackerConfig{
+			Packer: struct {
+				VersionConstraints []VersionConstraint
+				RequiredPlugins    []*RequiredPlugins
+			}{
+				RequiredPlugins: []*RequiredPlugins{
+					{RequiredPlugins: map[string]*RequiredPlugin{
+						"amazon": {
+							Name:   "amazon",
+							Source: "github.com/hashicorp/amazon",
+							Type:   &addrs.Plugin{"github.com", "hashicorp", "amazon"},
+							Requirement: VersionConstraint{
+								Required: mustVersionConstraints(version.NewConstraint("~> v1.2.3")),
 							},
+							PluginDependencyReason: PluginDependencyExplicit,
 						},
-					},
+					}},
 				},
-			}},
+			},
+		}},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
-			cfg := PackerConfig{
-				Packer:                  tt.fields.Packer,
-				Basedir:                 tt.fields.Basedir,
-				CorePackerVersionString: tt.fields.CorePackerVersionString,
-				Cwd:                     tt.fields.Cwd,
-				Sources:                 tt.fields.Sources,
-				InputVariables:          tt.fields.InputVariables,
-				LocalVariables:          tt.fields.LocalVariables,
-				Datasources:             tt.fields.Datasources,
-				LocalBlocks:             tt.fields.LocalBlocks,
-				ValidationOptions:       tt.fields.ValidationOptions,
-				Builds:                  tt.fields.Builds,
-				parser:                  tt.fields.parser,
-				files:                   tt.fields.files,
-				except:                  tt.fields.except,
-				only:                    tt.fields.only,
-				force:                   tt.fields.force,
-				debug:                   tt.fields.debug,
-				onError:                 tt.fields.onError,
+			cfg := tt.cfg
+			file, diags := cfg.parser.ParseHCL([]byte(tt.requirePlugins), "required_plugins.pkr.hcl")
+			if len(diags) > 0 {
+				t.Fatal(diags)
+			}
+			if diags := cfg.decodeRequiredPluginsBlock(file); len(diags) > 0 {
+				t.Fatal(diags)
+			}
+
+			rest, diags := cfg.parser.ParseHCL([]byte(tt.restOfTemplate), "rest.pkr.hcl")
+			if len(diags) > 0 {
+				t.Fatal(diags)
 			}
-			if gotDiags := cfg.inferImplicitRequiredPluginFromBlocks(tt.args.block); (len(gotDiags) > 0) != tt.wantDiags {
-				t.Errorf("PackerConfig.inferImplicitRequiredPluginFromBlocks() = %v", gotDiags)
+			if gotDiags := cfg.decodeImplicitRequiredPluginsBlocks(rest); (len(gotDiags) > 0) != tt.wantDiags {
+				t.Fatal(gotDiags)
 			}
-			if diff := cmp.Diff(tt.wantConfig, cfg, cmpopts.IgnoreUnexported(PackerConfig{})); diff != "" {
+			if diff := cmp.Diff(tt.wantConfig, cfg, cmpOpts...); diff != "" {
 				t.Errorf("PackerConfig.inferImplicitRequiredPluginFromBlocks() unexpected PackerConfig: %v", diff)
 			}
 		})