diff --git a/playground/assets/__tests__/relative-base/relative-base-assets.spec.ts b/playground/assets/__tests__/relative-base/assets-relative-base.spec.ts
similarity index 100%
rename from playground/assets/__tests__/relative-base/relative-base-assets.spec.ts
rename to playground/assets/__tests__/relative-base/assets-relative-base.spec.ts
diff --git a/playground/assets/__tests__/runtime-base/runtime-base-assets.spec.ts b/playground/assets/__tests__/runtime-base/assets-runtime-base.spec.ts
similarity index 100%
rename from playground/assets/__tests__/runtime-base/runtime-base-assets.spec.ts
rename to playground/assets/__tests__/runtime-base/assets-runtime-base.spec.ts
diff --git a/playground/assets/__tests__/url-base/url-base-assets.spec.ts b/playground/assets/__tests__/url-base/assets-url-base.spec.ts
similarity index 100%
rename from playground/assets/__tests__/url-base/url-base-assets.spec.ts
rename to playground/assets/__tests__/url-base/assets-url-base.spec.ts
diff --git a/playground/config/__tests__/load.spec.ts b/playground/config/__tests__/config.spec.ts
similarity index 100%
rename from playground/config/__tests__/load.spec.ts
rename to playground/config/__tests__/config.spec.ts
diff --git a/playground/css-codesplit-cjs/__tests__/css-codesplit.spec.ts b/playground/css-codesplit-cjs/__tests__/css-codesplit-cjs.spec.ts
similarity index 100%
rename from playground/css-codesplit-cjs/__tests__/css-codesplit.spec.ts
rename to playground/css-codesplit-cjs/__tests__/css-codesplit-cjs.spec.ts
diff --git a/playground/css-lightningcss/__tests__/lightningcss.spec.ts b/playground/css-lightningcss/__tests__/css-lightningcss.spec.ts
similarity index 100%
rename from playground/css-lightningcss/__tests__/lightningcss.spec.ts
rename to playground/css-lightningcss/__tests__/css-lightningcss.spec.ts
diff --git a/playground/css-sourcemap/__tests__/lib-entry/lib-entry.spec.ts b/playground/css-sourcemap/__tests__/lib-entry/css-sourcemap-lib-entry.spec.ts
similarity index 100%
rename from playground/css-sourcemap/__tests__/lib-entry/lib-entry.spec.ts
rename to playground/css-sourcemap/__tests__/lib-entry/css-sourcemap-lib-entry.spec.ts
diff --git a/playground/css/__tests__/no-css-minify/no-css-minify.spec.ts b/playground/css/__tests__/no-css-minify/css-no-css-minify.spec.ts
similarity index 100%
rename from playground/css/__tests__/no-css-minify/no-css-minify.spec.ts
rename to playground/css/__tests__/no-css-minify/css-no-css-minify.spec.ts
diff --git a/playground/css/__tests__/postcss-plugins-different-dir/postcss-plugins-different-dir.spec.ts b/playground/css/__tests__/postcss-plugins-different-dir/css-postcss-plugins-different-dir.spec.ts
similarity index 100%
rename from playground/css/__tests__/postcss-plugins-different-dir/postcss-plugins-different-dir.spec.ts
rename to playground/css/__tests__/postcss-plugins-different-dir/css-postcss-plugins-different-dir.spec.ts
diff --git a/playground/css/__tests__/same-file-name/same-file-name.spec.ts b/playground/css/__tests__/same-file-name/css-same-file-name.spec.ts
similarity index 100%
rename from playground/css/__tests__/same-file-name/same-file-name.spec.ts
rename to playground/css/__tests__/same-file-name/css-same-file-name.spec.ts
diff --git a/playground/json/__tests__/csr/json.spec.ts b/playground/json/__tests__/csr/json-csr.spec.ts
similarity index 100%
rename from playground/json/__tests__/csr/json.spec.ts
rename to playground/json/__tests__/csr/json-csr.spec.ts
diff --git a/playground/json/__tests__/ssr/json.spec.ts b/playground/json/__tests__/ssr/json-ssr.spec.ts
similarity index 100%
rename from playground/json/__tests__/ssr/json.spec.ts
rename to playground/json/__tests__/ssr/json-ssr.spec.ts
diff --git a/playground/legacy/__tests__/client-and-ssr/client-legacy-ssr-sequential-builds.spec.ts b/playground/legacy/__tests__/client-and-ssr/legacy-client-legacy-ssr-sequential-builds.spec.ts
similarity index 100%
rename from playground/legacy/__tests__/client-and-ssr/client-legacy-ssr-sequential-builds.spec.ts
rename to playground/legacy/__tests__/client-and-ssr/legacy-client-legacy-ssr-sequential-builds.spec.ts
diff --git a/playground/legacy/__tests__/no-polyfills-no-systemjs/no-polyfills-no-systemjs.spec.ts b/playground/legacy/__tests__/no-polyfills-no-systemjs/legacy-no-polyfills-no-systemjs.spec.ts
similarity index 100%
rename from playground/legacy/__tests__/no-polyfills-no-systemjs/no-polyfills-no-systemjs.spec.ts
rename to playground/legacy/__tests__/no-polyfills-no-systemjs/legacy-no-polyfills-no-systemjs.spec.ts
diff --git a/playground/legacy/__tests__/no-polyfills/no-polyfills.spec.ts b/playground/legacy/__tests__/no-polyfills/legacy-no-polyfills.spec.ts
similarity index 100%
rename from playground/legacy/__tests__/no-polyfills/no-polyfills.spec.ts
rename to playground/legacy/__tests__/no-polyfills/legacy-no-polyfills.spec.ts
diff --git a/playground/legacy/__tests__/watch/styles-only-entry-watch.spec.ts b/playground/legacy/__tests__/watch/legacy-styles-only-entry-watch.spec.ts
similarity index 100%
rename from playground/legacy/__tests__/watch/styles-only-entry-watch.spec.ts
rename to playground/legacy/__tests__/watch/legacy-styles-only-entry-watch.spec.ts
diff --git a/playground/optimize-deps-no-discovery/__tests__/optimize-deps.spec.ts b/playground/optimize-deps-no-discovery/__tests__/optimize-deps-no-discovery.spec.ts
similarity index 100%
rename from playground/optimize-deps-no-discovery/__tests__/optimize-deps.spec.ts
rename to playground/optimize-deps-no-discovery/__tests__/optimize-deps-no-discovery.spec.ts
diff --git a/playground/proxy-bypass/__tests__/proxy-hmr.spec.ts b/playground/proxy-bypass/__tests__/proxy-bypass.spec.ts
similarity index 100%
rename from playground/proxy-bypass/__tests__/proxy-hmr.spec.ts
rename to playground/proxy-bypass/__tests__/proxy-bypass.spec.ts
diff --git a/playground/worker/__tests__/es/es-worker.spec.ts b/playground/worker/__tests__/es/worker-es.spec.ts
similarity index 100%
rename from playground/worker/__tests__/es/es-worker.spec.ts
rename to playground/worker/__tests__/es/worker-es.spec.ts
diff --git a/playground/worker/__tests__/iife/iife-worker.spec.ts b/playground/worker/__tests__/iife/worker-iife.spec.ts
similarity index 100%
rename from playground/worker/__tests__/iife/iife-worker.spec.ts
rename to playground/worker/__tests__/iife/worker-iife.spec.ts
diff --git a/playground/worker/__tests__/relative-base-iife/relative-base-iife-worker.spec.ts b/playground/worker/__tests__/relative-base-iife/worker-relative-base-iife.spec.ts
similarity index 100%
rename from playground/worker/__tests__/relative-base-iife/relative-base-iife-worker.spec.ts
rename to playground/worker/__tests__/relative-base-iife/worker-relative-base-iife.spec.ts
diff --git a/playground/worker/__tests__/relative-base/relative-base-worker.spec.ts b/playground/worker/__tests__/relative-base/worker-relative-base.spec.ts
similarity index 100%
rename from playground/worker/__tests__/relative-base/relative-base-worker.spec.ts
rename to playground/worker/__tests__/relative-base/worker-relative-base.spec.ts
diff --git a/playground/worker/__tests__/sourcemap-hidden/sourcemap-hidden-worker.spec.ts b/playground/worker/__tests__/sourcemap-hidden/worker-sourcemap-hidden.spec.ts
similarity index 100%
rename from playground/worker/__tests__/sourcemap-hidden/sourcemap-hidden-worker.spec.ts
rename to playground/worker/__tests__/sourcemap-hidden/worker-sourcemap-hidden.spec.ts
diff --git a/playground/worker/__tests__/sourcemap-inline/sourcemap-inline-worker.spec.ts b/playground/worker/__tests__/sourcemap-inline/worker-sourcemap-inline.spec.ts
similarity index 100%
rename from playground/worker/__tests__/sourcemap-inline/sourcemap-inline-worker.spec.ts
rename to playground/worker/__tests__/sourcemap-inline/worker-sourcemap-inline.spec.ts
diff --git a/playground/worker/__tests__/sourcemap/sourcemap-worker.spec.ts b/playground/worker/__tests__/sourcemap/worker-sourcemap.spec.ts
similarity index 100%
rename from playground/worker/__tests__/sourcemap/sourcemap-worker.spec.ts
rename to playground/worker/__tests__/sourcemap/worker-sourcemap.spec.ts