refactor(http): reached full line coverage, unwind ternary to improve reability (#6885)

Author: achedges

http/etag.ts

@@ -158,7 +158,11 @@ export async function eTag(
       ? calcFileInfo(entity, options)
       : calcEntity(entity, options));
 
-  return tag ? weak ? `W/"${tag}"` : `"${tag}"` : undefined;
+  if (!tag) {
+    return undefined;
+  }
+
+  return weak ? `W/"${tag}"` : `"${tag}"`;
 }
 
 const STAR_REGEXP = /^\s*\*\s*$/;

http/etag_test.ts

@@ -147,3 +147,17 @@ Deno.test({
     }
   },
 });
+
+Deno.test({
+  name: "eTag() returns undefined when calcFileInfo returns undefined",
+  async fn() {
+    {
+      const result = await eTag({
+        mtime: null,
+        size: 1024,
+      });
+
+      assert(result === undefined);
+    }
+  },
+});