Tests: added js_body_filter test with non-UTF8 data.

To test for implicit UTF8 conversion.

nginx/t/js_body_filter.t

@@ -55,6 +55,11 @@ http {
  proxy_pass http://127.0.0.1:8081/source;
  }
 
+ location /buffer_type_nonutf8 {
+ js_body_filter test.buffer_type buffer_type=buffer;
+ proxy_pass http://127.0.0.1:8081/nonutf8_source;
+ }
+
  location /forward {
  js_body_filter test.forward buffer_type=string;
  proxy_pass http://127.0.0.1:8081/source;
@@ -80,6 +85,11 @@ http {
  postpone_output 1;
  js_content test.source;
  }
+
+ location /nonutf8_source {
+ postpone_output 1;
+ js_content test.nonutf8_source;
+ }
  }
 }
 
@@ -128,6 +138,17 @@ $t->write_file('test.js', <<EOF);
  chain(chunks, 0);
  }
 
+ function nonutf8_source(r) {
+ var chunks = ['aaaa', 'bb', 'cc', 'dddd'].map(v=>Buffer.from(v, 'hex'));
+ chunks.delay = 5;
+ chunks.r = r;
+ chunks.chain = chain;
+
+ r.status = 200;
+ r.sendHeader();
+ chain(chunks, 0);
+ }
+
  function filter(r, data, flags) {
  if (flags.last || data.length >= Number(r.args.len)) {
  r.sendBuffer(`\${data}|`, flags);
@@ -149,16 +170,18 @@ $t->write_file('test.js', <<EOF);
  }
 
  export default {njs: test_njs, append, buffer_type, filter, forward,
- prepend, source};
+ prepend, source, nonutf8_source};
 
 EOF
 
-$t->try_run('no njs body filter')->plan(6);
+$t->try_run('no njs body filter')->plan(7);
 
 ###############################################################################
 
 like(http_get('/append'), qr/AAABBCDDDDXXX/, 'append');
 like(http_get('/buffer_type'), qr/AAABBCDDDD/, 'buffer type');
+like(http_get('/buffer_type_nonutf8'), qr/\xaa\xaa\xbb\xcc\xdd\xdd/,
+ 'buffer type nonutf8');
 like(http_get('/forward'), qr/AAABBCDDDD/, 'forward');
 like(http_get('/filter?len=3'), qr/AAA|DDDD|/, 'filter 3');
 like(http_get('/filter?len=2&dup=1'), qr/AAA|AAABB|BBDDDD|DDDD/,