Revert "Remove tests for code that was supposed to be removed in v4"

This reverts commit 6bce2f9.

packages/@ember/-internals/glimmer/tests/integration/components/curly-components-test.js

@@ -1269,7 +1269,7 @@ moduleFor(
 
     ['@test non-block with properties on this.attrs']() {
       this.registerComponent('non-block', {
-        template: 'In layout - someProp: {{@someProp}}',
+        template: 'In layout - someProp: {{this.attrs.someProp}}{{log this.attrs}}',
       });
 
       this.render('{{non-block someProp=this.prop}}', {
@@ -1476,10 +1476,13 @@ moduleFor(
       );
     }
 
-    ['@test @foo === foo']() {
+    ['@test this.attrs.foo === @foo === foo']() {
       this.registerComponent('foo-bar', {
         template: strip`
-        Args: {{@value}} | {{this.value}}
+        Args: {{this.attrs.value}} | {{@value}} | {{this.value}}
+        {{#each this.attrs.items as |item|}}
+          {{item}}
+        {{/each}}
         {{#each @items as |item|}}
           {{item}}
         {{/each}}
@@ -1503,11 +1506,11 @@ moduleFor(
         this.context.set('model.items', [1]);
       });
 
-      this.assertText(strip`Args: lul | lul11`);
+      this.assertText(strip`Args: lul | lul | lul111`);
 
       runTask(() => this.context.set('model', { value: 'wat', items: [1, 2, 3] }));
 
-      this.assertText('Args: wat | wat123123');
+      this.assertText('Args: wat | wat | wat123123123');
     }
 
     ['@test non-block with properties on self']() {
@@ -1572,6 +1575,36 @@ moduleFor(
       }, "Using {{attrs}} to reference named arguments is not supported. {{attrs.someProp}} should be updated to {{@someProp}}. ('my-app/templates/components/with-block.hbs' @ L1:C24) ");
     }
 
+    ['@test block with properties on this.attrs']() {
+      this.registerComponent('with-block', {
+        template: 'In layout - someProp: {{this.attrs.someProp}} - {{yield}}',
+      });
+
+      this.render(
+        strip`
+      {{#with-block someProp=this.prop}}
+        In template
+      {{/with-block}}`,
+        {
+          prop: 'something here',
+        }
+      );
+
+      this.assertText('In layout - someProp: something here - In template');
+
+      runTask(() => this.rerender());
+
+      this.assertText('In layout - someProp: something here - In template');
+
+      runTask(() => this.context.set('prop', 'something else'));
+
+      this.assertText('In layout - someProp: something else - In template');
+
+      runTask(() => this.context.set('prop', 'something here'));
+
+      this.assertText('In layout - someProp: something here - In template');
+    }
+
     ['@test block with named argument']() {
       this.registerComponent('with-block', {
         template: 'In layout - someProp: {{@someProp}} - {{yield}}',

packages/ember-template-compiler/lib/plugins/assert-against-attrs.ts

@@ -32,7 +32,6 @@ export default function assertAgainstAttrs(env: EmberASTPluginEnvironment): ASTP
     stack.push(parent.concat(blockParams));
   }
 
-  // https://deprecations.emberjs.com/v3.x#toc_attrs-arg-access
   return {
     name: 'assert-against-attrs',