Test Highcharts with selenium webdriver
# Get the origin and datapoints of the first line
s = selenium.get_eval("window.jQuery('svg g.highcharts-tracker path:eq(0)')")
splitted = re.split('s+Ls+', s)
origin = splitted[0].split(' ')[1:]
data = [p.split(' ') for p in splitted[1:]]
# Convert to floats
origin = [float(origin[1]), float(origin[2])]
data = [[float(x), float(y)] for x, y in data]

# Get the min and max y-axis value and position
min_y_val = float(selenium.get_eval(
             "window.jQuery('svg g.highcharts-axis:eq(1) text:first').text()")
max_y_val = float(selenium.get_eval(
             "window.jQuery('svg g.highcharts-axis:eq(1) text:last').text()")
min_y_pos = float(selenium.get_eval(
             "window.jQuery('svg g.highcharts-axis:eq(1) text:first').attr('y')")
max_y_pos = float(selenium.get_eval(
             "window.jQuery('svg g.highcharts-axis:eq(1) text:last').attr('y')")

# Calculate the value based on the retrieved positions
y_scale = min_y_pos - max_y_pos
y_range = max_y_val - min_y_val
y_percentage = data[0][1] * 100.0 / y_scale
value = max_y_val - (y_range * percentage)