Add further tests for error handling, improving overall coverage to 9…

…4.2%

tests/kernel.test.ts

@@ -84,7 +84,7 @@ Deno.test("test middleware catches 404 error", async () => {
     const { error } = ctx;
 
     if (error?.status === 404) {
-      return 'Page not found';
+      return "Page not found";
     }
   });
 
@@ -104,7 +104,7 @@ Deno.test("test middleware catches server error", async () => {
     const { error } = ctx;
 
     if (error?.status === 500) {
-      return 'Internal server error';
+      return "Internal server error";
     }
   });
 
@@ -118,16 +118,16 @@ Deno.test("test middleware catches bad request error", async () => {
 
   app.add((_ctx: Context) => {
     throw new BadRequest([
-      'There was an error in validation of field #1',
-      'There was an error in validation of field #2'
+      "There was an error in validation of field #1",
+      "There was an error in validation of field #2",
     ]);
   });
 
   app.add((ctx: Context) => {
     const { error } = ctx;
 
     if (error?.status === 400) {
-      return 'Bad request';
+      return "Bad request";
     }
   });