Would be better to show more examples

The method has a different name in the first test buyOrPass instead of buy_or_pass

Anyone know why this doesn't work? I get the error message bad value for range but when I try it in irb it works:

def summation(x)
a = [*1..x]
b = a.inject(0, &:+)
if x.is_a?(Integer)
return b
else
"Invalid Value"
end
end

State that input will be floats or integers as well as postive or negative

Does this code work? It works in my terminal put not on this kata.

def buy_or_pass(stock_price,all_time_high)
a = all_time_high * 0.8
if stock_price < a
'Buy'
else
'Pass'
end
end

Hello all,
I'm a little stuck in my understanding of Ruby. So far I know that 'string'is_a?(String) => true , whereas 12.is_a?(String) => false. But my method isn't working:
def repeat_it(string,n)
string.is_a?(String)
if true
string * n
elsif false
"Not a string"
end
end

This passes everything expect when the method isn't a string I get this message:

Returned unexpected value - Expected: "Not a string", instead got: []

Any advice would be useful. Thanks.