refactor tail invokation into logtail.sh

src/test/logs-test.js

@@ -0,0 +1,29 @@
+/* global it:false */
+/* global describe:false */
+
+'use strict';
+
+const expect = require('expect.js'),
+    fs = require('fs'),
+    logs = require('../logs.js'),
+    stream = require('stream');
+
+describe('log stream', function () {
+    it('can create stream', function (done) {
+        fs.writeFileSync('/tmp/test-input.log', '2022-10-09T15:19:48.740Z message', 'utf8');
+        const input = fs.createReadStream('/tmp/test-input.log');
+        const log = new logs.LogStream({ format: 'json', source: 'test' });
+        const output = fs.createWriteStream('/tmp/test-output.log');
+
+        stream.pipeline(input, log, output, function (error) {
+            expect(error).to.not.be.ok();
+
+            const out = fs.readFileSync('/tmp/test-output.log', 'utf8');
+            const firstLine = JSON.parse(out.split('\n')[0]);
+            expect(firstLine.realtimeTimestamp).to.be.a('number');
+            expect(firstLine.message).to.be('message');
+            expect(firstLine.source).to.be('test');
+            done();
+        });
+    });
+});