diff --git a/src/webgpu/shader/validation/parse/requires.spec.ts b/src/webgpu/shader/validation/parse/requires.spec.ts
index 0b1bc210056f..bcd3e617e078 100644
--- a/src/webgpu/shader/validation/parse/requires.spec.ts
+++ b/src/webgpu/shader/validation/parse/requires.spec.ts
@@ -2,6 +2,7 @@ export const description = `Parser validation tests for requires`;
 
 import { makeTestGroup } from '../../../../common/framework/test_group.js';
 import { keysOf } from '../../../../common/util/data_tables.js';
+import { assert } from '../../../../common/util/util.js';
 import { kKnownWGSLLanguageFeatures } from '../../../capability_info.js';
 import { ShaderValidationTest } from '../shader_validation_test.js';
 
@@ -96,3 +97,17 @@ g.test('wgsl_matches_api')
     const code = `requires ${t.params.feature};`;
     t.expectCompileResult(t.hasLanguageFeature(t.params.feature), code);
   });
+
+g.test('have_all_language_features')
+  .desc(
+    `The spec technically requires support for all WGSL language features listed in the spec.
+    This test enforces that. It should be the ONLY test that fails when a new feature is
+    unavailable - others should skip themselves.`
+  )
+  .params(u => u.combine('feature', kKnownWGSLLanguageFeatures))
+  .fn(t => {
+    // First check that the API exposes the feature.
+    assert(t.hasLanguageFeature(t.params.feature));
+    // If it does, then also check that WGSL allows it.
+    t.expectCompileResult(true, `requires ${t.params.feature};`);
+  });