1 files changed, 12 insertions, 13 deletions
diff --git a/std/http/_io_test.ts b/std/http/_io_test.ts
index 3e74e365d..3b385d013 100644
--- a/std/http/_io_test.ts
+++ b/std/http/_io_test.ts
@@ -1,5 +1,4 @@
 import {
-  AssertionError,
   assertThrowsAsync,
   assertEquals,
   assert,
@@ -105,8 +104,8 @@ test("readTrailer should throw if undeclared headers found in trailer", async ()
       async () => {
         await readTrailers(h, new BufReader(new Buffer(encode(trailer))));
       },
-      Error,
-      "Undeclared trailer field"
+      Deno.errors.InvalidData,
+      `Undeclared trailers: [ "`
     );
   }
 });
@@ -120,8 +119,8 @@ test("readTrailer should throw if trailer contains prohibited fields", async ()
       async () => {
         await readTrailers(h, new BufReader(new Buffer()));
       },
-      Error,
-      "Prohibited field for trailer"
+      Deno.errors.InvalidData,
+      `Prohibited trailer names: [ "`
     );
   }
 });
@@ -145,15 +144,15 @@ test("writeTrailer should throw", async () => {
     () => {
       return writeTrailers(w, new Headers(), new Headers());
     },
-    Error,
-    'must have "trailer"'
+    TypeError,
+    "Missing trailer header."
   );
   await assertThrowsAsync(
     () => {
       return writeTrailers(w, new Headers({ trailer: "deno" }), new Headers());
     },
-    Error,
-    "only allowed"
+    TypeError,
+    `Trailers are only allowed for "transfer-encoding: chunked", got "transfer-encoding: null".`
   );
   for (const f of ["content-length", "trailer", "transfer-encoding"]) {
     await assertThrowsAsync(
@@ -164,8 +163,8 @@ test("writeTrailer should throw", async () => {
           new Headers({ [f]: "1" })
         );
       },
-      AssertionError,
-      "prohibited"
+      TypeError,
+      `Prohibited trailer names: [ "`
     );
   }
   await assertThrowsAsync(
@@ -176,8 +175,8 @@ test("writeTrailer should throw", async () => {
         new Headers({ node: "js" })
       );
     },
-    AssertionError,
-    "Not trailer"
+    TypeError,
+    `Undeclared trailers: [ "node" ].`
   );
 });