fix(ssr): address scope token test failures (#5324)

* test(ssr): add test for imported template not used for rendering

* fix(ssr-compiler): always attach default template

Can't detect at compile time whether or not it will be used

* test(ssr): add test for empty render method

* chore(fixtures): rename empty-render to render-undefined

* chore(fixtures): clean up test

* test(ssr): add fixture for rendering with an invalid function

* test(ssr): update scope token tests to expect correct results

Author: wjhsf

packages/@lwc/engine-server/src/__tests__/fixtures/scope-token-extended/config.json

@@ -1,4 +1,7 @@
 {
     "entry": "x/component",
-    "features": ["DISABLE_SCOPE_TOKEN_VALIDATION"]
+    "features": ["DISABLE_SCOPE_TOKEN_VALIDATION"],
+    "ssrFiles": {
+        "expected": "expected-ssr.html"
+    }
 }

packages/@lwc/engine-server/src/__tests__/fixtures/scope-token-extended/expected-ssr.html

@@ -0,0 +1,10 @@
+<fixture-test class="lwc-6a8uqob2ku4-host" data-lwc-host-scope-token="lwc-6a8uqob2ku4-host">
+  <style class="lwc-6a8uqob2ku4" id="lwc-style--0" type="text/css">
+    p.lwc-6a8uqob2ku4 {font-size: 2em;}
+  </style>
+  <lwc-style style-id="lwc-style--0">
+  </lwc-style>
+  <p class="lwc-6a8uqob2ku4">
+    je suis une pomme de terre
+  </p>
+</fixture-test>

packages/@lwc/engine-server/src/__tests__/fixtures/scope-token/.skip

@@ -1,3 +1,7 @@
 {
-    "entry": "x/component"
+    "entry": "x/component",
+    "ssrFiles": {
+        "error": "error-ssr.txt",
+        "expected": "expected-ssr.html"
+    }
 }

packages/@lwc/engine-server/src/__tests__/fixtures/scope-token/config.json

@@ -0,0 +1,10 @@
+<fixture-test class="lwc-6a8uqob2ku4-host" data-lwc-host-scope-token="lwc-6a8uqob2ku4-host">
+  <style class="lwc-6a8uqob2ku4" id="lwc-style--0" type="text/css">
+    p.lwc-6a8uqob2ku4 {font-size: 2em;}
+  </style>
+  <lwc-style style-id="lwc-style--0">
+  </lwc-style>
+  <p class="lwc-6a8uqob2ku4">
+    je suis une pomme de terre
+  </p>
+</fixture-test>

packages/@lwc/engine-server/src/__tests__/fixtures/scope-token/error-ssr.txt

@@ -8,8 +8,6 @@
 // We should slowly drive down these test failures or at least document where we expect the failures
 // TODO [#4815]: enable all SSR v2 tests
 export const expectedFailures = new Set([
-    'scope-token/config.json',
-    'scope-token-extended/config.json',
     'render-undefined/config.json',
     'render-bad-value/config.json',
 ]);