test: increase coverage for Blob

Refs: https://coverage.nodejs.org/coverage-68e6673224365120/lib/internal/blob.js.html#L132

PR-URL: https://github.com/nodejs/node/pull/38515
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Darshan Sen <raisinten@gmail.com>

test/parallel/test-blob.js

@@ -3,6 +3,7 @@
 const common = require('../common');
 const assert = require('assert');
 const { Blob } = require('buffer');
+const { inspect } = require('util');
 
 {
   const b = new Blob();
@@ -190,3 +191,10 @@ assert.throws(() => new Blob({}), {
     assert.strictEqual(text, 'test42');
   }));
 }
+
+{
+  const b = new Blob();
+  assert.strictEqual(inspect(b, { depth: null }),
+                     'Blob { size: 0, type: \'\' }');
+  assert.strictEqual(inspect(b, { depth: -1 }), '[Blob]');
+}