style(test): update test helper lint-friendly

spec/helpers/tests2png/painter.js

@@ -1,3 +1,4 @@
+/*eslint-disable no-param-reassign, no-use-before-define*/
 var gm = require('gm');
 var _ = require('lodash');
 
@@ -66,6 +67,12 @@ function measureObservableArrow(maxFrame, streamData) {
  return {startX: startX, endX: endX};
 }
 
+function measureInclination(startX, endX, angle) {
+ var length = endX - startX;
+ var cotAngle = Math.cos(angle * TO_RAD) / Math.sin(angle * TO_RAD);
+ return (length / cotAngle);
+}
+
 function measureNestedStreamHeight(maxFrame, streamData) {
  var measurements = measureObservableArrow(maxFrame, streamData);
  var startX = measurements.startX;
@@ -76,22 +83,16 @@ function measureNestedStreamHeight(maxFrame, streamData) {
 function measureStreamHeight(maxFrame) {
  return function measureStreamHeightWithMaxFrame(streamData) {
  var maxMessageHeight = streamData.messages
- .map(function(message) {
+ .map(function (message) {
  return isNestedStreamData(message) ?
  measureNestedStreamHeight(maxFrame, message.notification.value) + OBSERVABLE_HEIGHT * 0.25 :
  OBSERVABLE_HEIGHT * 0.5;
  })
- .reduce(function(acc, curr) {
+ .reduce(function (acc, curr) {
  return curr > acc ? curr : acc;
  }, 0);
  return OBSERVABLE_HEIGHT * 0.5 + maxMessageHeight;
- }
-}
-
-function measureInclination(startX, endX, angle) {
- var length = endX - startX;
- var cotAngle = Math.cos(angle * TO_RAD) / Math.sin(angle * TO_RAD);
- return (length / cotAngle);
+ };
 }
 
 function drawObservableArrow(out, maxFrame, y, angle, streamData) {
@@ -242,7 +243,6 @@ function sanitizeHigherOrderInputStreams(inputStreams, outputStream) {
  });
 }
 
-
 module.exports = function painter(inputStreams, operatorLabel, outputStream, filename) {
  var maxFrame = getMaxFrame(inputStreams.concat(outputStream));
  inputStreams = sanitizeHigherOrderInputStreams(inputStreams, outputStream);