Graph: Fix to legend value Max and negative values, Fixes #1136

src/app/components/timeSeries.js

@@ -64,7 +64,7 @@ function (_, kbn) {
     var result = [];
 
     this.stats.total = 0;
-    this.stats.max = Number.MIN_VALUE;
+    this.stats.max = -Number.MAX_VALUE;
     this.stats.min = Number.MAX_VALUE;
     this.stats.avg = null;
     this.stats.current = null;
@@ -106,7 +106,7 @@ function (_, kbn) {
       this.stats.timeStep = this.datapoints[1][1] - this.datapoints[0][1];
     }
 
-    if (this.stats.max === Number.MIN_VALUE) { this.stats.max = null; }
+    if (this.stats.max === -Number.MAX_VALUE) { this.stats.max = null; }
     if (this.stats.min === Number.MAX_VALUE) { this.stats.min = null; }
 
     if (result.length) {

src/test/specs/timeSeries-specs.js

@@ -35,6 +35,14 @@ define([
         expect(series.stats.current).to.be(10);
       });
 
+      it('max value should work for negative values', function() {
+        series = new TimeSeries({
+          datapoints: [[-10,1], [-4, 2]]
+        });
+        series.getFlotPairs('null', yAxisFormats);
+        expect(series.stats.max).to.be(-4);
+      });
+
     });
 
     describe('series overrides', function() {