js/graph.js, tests: add 'reads'

browser/js/graph.js

@@ -1649,7 +1649,7 @@ Graph.prototype = {
         // duplicate from info; refactor
         var read_number = this.m.reads.segmented
         var percent = (read_number[this.m.t] / this.m.reads.total[this.m.t]) * 100;
-        var reads   = this.m.toStringThousands(read_number[this.m.t]) + " (" + percent.toFixed(2) + "%)";
+        var reads   = this.m.toStringThousands(read_number[this.m.t]) + " reads (" + percent.toFixed(2) + "%)";
         tooltip    += breakChar + reads
         return tooltip
     },

browser/test/functional/issues/test_4370.rb

@@ -39,7 +39,7 @@ class TestGraph < BrowserTest
     sleep 1.5 # no update icon in this case; so whould use a fixed time
     assert ( $tooltip.style('opacity') == "1" ), "correct opacity of tooltip when label is hover"
 
-    content = "T8045-BC082-fu1\n2019-12-27\n+10\n250 000 (57.19%)"
+    content = "T8045-BC082-fu1\n2019-12-27\n+10\n250 000 reads (57.19%)"
     assert ( $tooltip.text == content), "Correct text in the sample tooltip"
   end
 
@@ -51,7 +51,7 @@ class TestGraph < BrowserTest
     sleep 2 
     assert ( $tooltip.style('opacity') == "1" ), "correct opacity of tooltip when label is hover"
 
-    content = "helloworld\n741 684 (94.26%)"
+    content = "helloworld\n741 684 reads (94.26%)"
     assert ( $tooltip.text == content), "Correct text in the sample tooltip"
   end