skip brotli tests on node 8

Should not have been removed in a308619.

test/brotli-flush.js

@@ -1,5 +1,9 @@
 'use strict';
 const t = require('tap')
+if (!require('zlib').BrotliDecompress) {
+  t.plan(0, 'brotli not supported')
+  process.exit(0)
+}
 const zlib = require('../')
 const {resolve} = require('path')
 const fixture = resolve(__dirname, 'fixtures/person.jpg')

test/brotli-from-brotli.js

@@ -3,6 +3,10 @@
 // piped in as fast as possible.
 
 const t = require('tap')
+if (!require('zlib').BrotliDecompress) {
+  t.plan(0, 'brotli not supported')
+  process.exit(0)
+}
 const zlib = require('../')
 const {resolve, basename} = require('path')
 const {sync: mkdirp} = require('mkdirp')

test/brotli-from-string.js

@@ -2,6 +2,10 @@
 // Test compressing and uncompressing a string with brotli
 
 const t = require('tap')
+if (!require('zlib').BrotliDecompress) {
+  t.plan(0, 'brotli not supported')
+  process.exit(0)
+}
 const zlib = require('../');
 
 const inputString = 'ΩΩLorem ipsum dolor sit amet, consectetur adipiscing eli' +

test/brotli-kmaxlength-rangeerror.js

@@ -5,12 +5,16 @@
 // https://github.com/nodejs/node/pull/1811
 
 const t = require('tap')
-
 // Change kMaxLength for zlib to trigger the error without having to allocate
 // large Buffers.
 const buffer = require('buffer');
 const oldkMaxLength = buffer.kMaxLength;
 buffer.kMaxLength = 128;
+if (!require('zlib').BrotliDecompress) {
+  t.plan(0, 'brotli not supported')
+  process.exit(0)
+}
+
 const zlib = require('../');
 buffer.kMaxLength = oldkMaxLength;
 

test/brotli.js

@@ -1,4 +1,8 @@
 const t = require('tap')
+if (!require('zlib').BrotliDecompress) {
+  t.plan(0, 'brotli not supported')
+  process.exit(0)
+}
 const zlib = require('../')
 const fs = require('fs')
 const {resolve} = require('path')