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Andrew WC Brown

2008-Jan-30 00:48 UTC

[rspec-users] catching errors, rspec basics

Trying to spec the following but don''t know if I''m using the
right matcher.
How do I spec? Plz, sugar on tops.

Audience.stats
- should have a stats of 80 when passed a flux of 10
- should return an error when passed a string (ERROR - 1)

1)
TypeError in ''Audience.stats should return an error when passed a
string''
String can''t be coerced into Fixnum
./audience.rb:11:in `*''
./audience.rb:11:in `stats=''
./audience_spec.rb:29:

Finished in 0.006333 seconds

2 examples, 1 failure
monsterbox:spec andrew_wc_brown$



class Audience

  attr_accessor :stats

  def initialize(name = nil,value = nil)
    @name ||= ''all''
    @value ||= value
  end

  def stats=(flux)
    @stats = @value * flux / 0.025
  end

  def market_share
    "The Market share is for #{@name} at a high of #{@stats}"
  end

end

describe "Audience.stats" do

before :all do
  @audience = Audience.new(nil,20)
end

  it  "should have a stats of 80 when passed a flux of 10" do
    @audience.stats = 10
    @audience.stats.should == 8000
  end

  it "should return an error when passed a string" do
    @audience.stats = ''Market Goblin''
    @audience.stats.should raise_error
  end
end
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Shane Mingins

2008-Jan-30 00:49 UTC

head link

[rspec-users] catching errors, rspec basics

Are you looking for something like this

lambda { @audience.stats = ''Market Goblin'' }.should
raise_error


On 30/01/2008, at 1:48 PM, Andrew WC Brown wrote:
> Trying to spec the following but don''t know if I''m using
the right
> matcher.
> How do I spec? Plz, sugar on tops.
>
> Audience.stats
> - should have a stats of 80 when passed a flux of 10
> - should return an error when passed a string (ERROR - 1)
>
> 1)
> TypeError in ''Audience.stats should return an error when passed a
> string''
> String can''t be coerced into Fixnum
> ./audience.rb:11:in `*''
> ./audience.rb:11:in `stats=''
> ./audience_spec.rb:29:
>
> Finished in 0.006333 seconds
>
> 2 examples, 1 failure
> monsterbox:spec andrew_wc_brown$
>
>
>
> class Audience
>
>   attr_accessor :stats
>
>   def initialize(name = nil,value = nil)
>     @name ||= ''all''
>     @value ||= value
>   end
>
>   def stats=(flux)
>     @stats = @value * flux / 0.025
>   end
>
>   def market_share
>     "The Market share is for #{@name} at a high of #{@stats}"
>   end
>
> end
>
> describe "Audience.stats" do
>
> before :all do
>   @audience = Audience.new(nil,20)
> end
>
>   it  "should have a stats of 80 when passed a flux of 10" do
>     @audience.stats = 10
>     @audience.stats.should == 8000
>   end
>
>   it "should return an error when passed a string" do
>     @audience.stats = ''Market Goblin''
>     @audience.stats.should raise_error
>   end
> end
> _______________________________________________
> rspec-users mailing list
> rspec-users at rubyforge.org
> http://rubyforge.org/mailman/listinfo/rspec-users


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Andrew WC Brown

2008-Jan-30 00:55 UTC

head link

[rspec-users] catching errors, rspec basics

try it, does the same thing =''(

On Jan 29, 2008 7:49 PM, Shane Mingins <smingins at elctech.com> wrote:
> Are you looking for something like this
> lambda { @audience.stats = ''Market Goblin'' }.should
raise_error
>
>
> On 30/01/2008, at 1:48 PM, Andrew WC Brown wrote:
>
> Trying to spec the following but don''t know if I''m using
the right
> matcher.
> How do I spec? Plz, sugar on tops.
>
> Audience.stats
> - should have a stats of 80 when passed a flux of 10
> - should return an error when passed a string (ERROR - 1)
>
> 1)
> TypeError in ''Audience.stats should return an error when passed a
string''
> String can''t be coerced into Fixnum
> ./audience.rb:11:in `*''
> ./audience.rb:11:in `stats=''
> ./audience_spec.rb:29:
>
> Finished in 0.006333 seconds
>
> 2 examples, 1 failure
> monsterbox:spec andrew_wc_brown$
>
>
>
> class Audience
>
>   attr_accessor :stats
>
>   def initialize(name = nil,value = nil)
>     @name ||= ''all''
>     @value ||= value
>   end
>
>   def stats=(flux)
>     @stats = @value * flux / 0.025
>   end
>
>   def market_share
>     "The Market share is for #{@name} at a high of #{@stats}"
>   end
>
> end
>
> describe "Audience.stats" do
>
> before :all do
>   @audience = Audience.new(nil,20)
> end
>
>   it  "should have a stats of 80 when passed a flux of 10" do
>     @audience.stats = 10
>     @audience.stats.should == 8000
>   end
>
>   it "should return an error when passed a string" do
>     @audience.stats = ''Market Goblin''
>     @audience.stats.should raise_error
>   end
> end
> _______________________________________________
> rspec-users mailing list
> rspec-users at rubyforge.org
> http://rubyforge.org/mailman/listinfo/rspec-users
>
>
>
>
>
> _______________________________________________
> rspec-users mailing list
> rspec-users at rubyforge.org
> http://rubyforge.org/mailman/listinfo/rspec-users
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Shane Mingins

2008-Jan-30 00:59 UTC

head link

[rspec-users] catching errors, rspec basics

Hmmmm

I just ran this and 2 examples, 0 failures

class Audience

   attr_accessor :stats

   def initialize(name = nil,value = nil)
     @name ||= ''all''
     @value ||= value
   end

   def stats=(flux)
     @stats = @value * flux / 0.025
   end

   def market_share
     "The Market share is for #{@name} at a high of #{@stats}"
   end

end


describe "Audience.stats" do

   before :all do
     @audience = Audience.new(nil,20)
   end

   it  "should have a stats of 80 when passed a flux of 10" do
     @audience.stats = 10
     @audience.stats.should == 8000
   end

   it "should return an error when passed a string" do
     lambda {@audience.stats = ''Market Goblin''}.should
raise_error
   end

end
On 30/01/2008, at 1:55 PM, Andrew WC Brown wrote:
> try it, does the same thing =''(
>
>


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David Chelimsky

2008-Jan-30 01:03 UTC

head link

[rspec-users] catching errors, rspec basics

On Jan 29, 2008 6:55 PM, Andrew WC Brown <omen.king at gmail.com>
wrote:> try it, does the same thing =''(
Shouldn''t be the exact same thing. What''s the whole error?

Also - what version of rspec? If trunk, do you have the latest (3268)?
>
>
>
> On Jan 29, 2008 7:49 PM, Shane Mingins <smingins at elctech.com>
wrote:
> >
> > Are you looking for something like this
> >
> >
> > lambda { @audience.stats = ''Market Goblin'' }.should
raise_error
> >
> >
> >
> >
> >
> >
> >
> >
> > On 30/01/2008, at 1:48 PM, Andrew WC Brown wrote:
> >
> >
> >
> >
> >
> >
> > Trying to spec the following but don''t know if I''m
using the right
> matcher.
> > How do I spec? Plz, sugar on tops.
> >
> >
> > Audience.stats
> > - should have a stats of 80 when passed a flux of 10
> > - should return an error when passed a string (ERROR - 1)
> >
> >
> > 1)
> > TypeError in ''Audience.stats should return an error when
passed a string''
> > String can''t be coerced into Fixnum
> > ./audience.rb:11:in `*''
> > ./audience.rb:11:in `stats=''
> > ./audience_spec.rb:29:
> >
> >
> > Finished in 0.006333 seconds
> >
> >
> > 2 examples, 1 failure
> > monsterbox:spec andrew_wc_brown$
> >
> >
> >
> >
> >
> >
> > class Audience
> >
> >   attr_accessor :stats
> >
> >   def initialize(name = nil,value = nil)
> >     @name ||= ''all''
> >     @value ||= value
> >   end
> >
> >   def stats=(flux)
> >     @stats = @value * flux / 0.025
> >   end
> >
> >
> >   def market_share
> >     "The Market share is for #{@name} at a high of
#{@stats}"
> >   end
> >
> > end
> >
> >
> > describe "Audience.stats" do
> >
> > before :all do
> >   @audience = Audience.new(nil,20)
> > end
> >
> >   it  "should have a stats of 80 when passed a flux of 10"
do
> >     @audience.stats = 10
> >     @audience.stats.should == 8000
> >   end
> >
> >   it "should return an error when passed a string" do
> >     @audience.stats = ''Market Goblin''
> >     @audience.stats.should raise_error
> >   end
> > end
> > _______________________________________________
> > rspec-users mailing list
> > rspec-users at rubyforge.org
> > http://rubyforge.org/mailman/listinfo/rspec-users
> >
> >
> >
> >
> >
> > _______________________________________________
> > rspec-users mailing list
> > rspec-users at rubyforge.org
> > http://rubyforge.org/mailman/listinfo/rspec-users
> >
>
>
> _______________________________________________
> rspec-users mailing list
> rspec-users at rubyforge.org
> http://rubyforge.org/mailman/listinfo/rspec-users
>

Andrew WC Brown

2008-Jan-30 01:47 UTC

head link

[rspec-users] catching errors, rspec basics

ohhhhh, I left in:
  it "should return an error when passed a string" do
    @audience.stats = ''Market Goblin''
    lambda {@audience.stats = ''Market Goblin''}.should
raise_error
  end

when yours is:

  it "should return an error when passed a string" do
    lambda {@audience.stats = ''Market Goblin''}.should
raise_error
  end

I''ve seen lambda before but not sure what it does.


On Jan 29, 2008 7:59 PM, Shane Mingins <smingins at elctech.com> wrote:
> Hmmmm
> I just ran this and 2 examples, 0 failures
>
> class Audience
>
>   attr_accessor :stats
>
>   def initialize(name = nil,value = nil)
>     @name ||= ''all''
>     @value ||= value
>   end
>
>   def stats=(flux)
>     @stats = @value * flux / 0.025
>   end
>
>   def market_share
>     "The Market share is for #{@name} at a high of #{@stats}"
>   end
>
> end
>
>
> describe "Audience.stats" do
>
>   before :all do
>     @audience = Audience.new(nil,20)
>   end
>
>   it  "should have a stats of 80 when passed a flux of 10" do
>     @audience.stats = 10
>     @audience.stats.should == 8000
>   end
>
>   it "should return an error when passed a string" do
>     lambda {@audience.stats = ''Market Goblin''}.should
raise_error
>   end
>
> end
> On 30/01/2008, at 1:55 PM, Andrew WC Brown wrote:
>
> try it, does the same thing =''(
>
>
>
>
>
> _______________________________________________
> rspec-users mailing list
> rspec-users at rubyforge.org
> http://rubyforge.org/mailman/listinfo/rspec-users
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Ben Mabey

2008-Jan-30 03:58 UTC

head link

[rspec-users] catching errors, rspec basics

Andrew WC Brown wrote:> ohhhhh, I left in:
>
>   it "should return an error when passed a string" do
>     @audience.stats = ''Market Goblin''
>     lambda {@audience.stats = ''Market Goblin''}.should
raise_error
>   end
>
> when yours is:
>
>   it "should return an error when passed a string" do
>     lambda {@audience.stats = ''Market Goblin''}.should
raise_error
>   end
>
> I''ve seen lambda before but not sure what it does.
A lambda in ruby is like a block or a Proc.  There are some differences 
between them, but for this simple use you can just think of it as a 
block of code that will be passed to the ''raise_error'' matcher
that then
runs that block of code checking to see if an Exception is raised when 
it is ran.  You can also pass in the specific exception type to be more 
specific. 

As  a personal preference I like to alias lambda to ''running''
in my
spec_helper.rb... I think this reads a lot better:
running {@audience.stats = ''Market Goblin''}.should raise_error

For more on lambdas refer to the pickaxe.  If you want more detailed 
information of the subtle differences between them, Procs, blocks, and 
methods check this out:
http://innig.net/software/ruby/closures-in-ruby.rb

-Ben

Andrew WC Brown

2008-Jan-30 04:12 UTC

head link

[rspec-users] catching errors, rspec basics

So if I understand correctly,
The following didn''t raise an error:

@audience.stats = ''Market Goblin''
@audience.stats.should raise_error

because audience.stats didn''t return an error.

Where as lambda will return an error.

On Jan 29, 2008 10:58 PM, Ben Mabey <ben at benmabey.com> wrote:
> Andrew WC Brown wrote:
> > ohhhhh, I left in:
> >
> >   it "should return an error when passed a string" do
> >     @audience.stats = ''Market Goblin''
> >     lambda {@audience.stats = ''Market
Goblin''}.should raise_error
> >   end
> >
> > when yours is:
> >
> >   it "should return an error when passed a string" do
> >     lambda {@audience.stats = ''Market
Goblin''}.should raise_error
> >   end
> >
> > I''ve seen lambda before but not sure what it does.
>
> A lambda in ruby is like a block or a Proc.  There are some differences
> between them, but for this simple use you can just think of it as a
> block of code that will be passed to the ''raise_error''
matcher that then
> runs that block of code checking to see if an Exception is raised when
> it is ran.  You can also pass in the specific exception type to be more
> specific.
>
> As  a personal preference I like to alias lambda to
''running'' in my
> spec_helper.rb... I think this reads a lot better:
> running {@audience.stats = ''Market Goblin''}.should
raise_error
>
> For more on lambdas refer to the pickaxe.  If you want more detailed
> information of the subtle differences between them, Procs, blocks, and
> methods check this out:
> http://innig.net/software/ruby/closures-in-ruby.rb
>
> -Ben
>
>
> _______________________________________________
> rspec-users mailing list
> rspec-users at rubyforge.org
> http://rubyforge.org/mailman/listinfo/rspec-users
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Ben Mabey

2008-Jan-30 04:41 UTC

head link

[rspec-users] catching errors, rspec basics

Sematics..  the method is never returning an error, it raises one.  So 
you can''t say @audience.stats="dsfds" and expect to see an
exception
returned right?
Since an exception is being raised you have to think of another way of 
testing it aside from checking it''s return value... So you could do 
something like:

an_error_was_raised = false
begin
  @audience.stats = ''Market Goblin''
rescue
  an_error_was_raised = true
end
an_error_was_raised.should == true

I am not suggesting you do this.  This is just to illustrate how you 
would going about testing to see if an error was raised.  The 
raise_error matcher is slightly more complicated in order to be able to 
ensure certain errors are raised but this is the general idea.  So the 
lambda does not return an error but the lambda is passed into the 
matcher so it can perform a similar operation as the code above 
illustrates.  I hope that clarified things a bit.

Here is another example for good measure with a lambda involved.. you 
can then see how a lambda how be useful in this situation:

an_error_was_raised = false
my_code = lambda { @audience.stats = ''Market Goblin'' }

begin
  my_code.call
rescue
  an_error_was_raised = true
end
an_error_was_raised.should == true

Better?

-Ben


Andrew WC Brown wrote:> So if I understand correctly,
>
> The following didn''t raise an error:
>
> @audience.stats = ''Market Goblin''
> @audience.stats.should raise_error
>
> because audience.stats didn''t return an error.
>
> Where as lambda will return an error.
>
> On Jan 29, 2008 10:58 PM, Ben Mabey <ben at benmabey.com 
> <mailto:ben at benmabey.com>> wrote:
>
>     Andrew WC Brown wrote:
>     > ohhhhh, I left in:
>     >
>     >   it "should return an error when passed a string" do
>     >     @audience.stats = ''Market Goblin''
>     >     lambda {@audience.stats = ''Market
Goblin''}.should raise_error
>     >   end
>     >
>     > when yours is:
>     >
>     >   it "should return an error when passed a string" do
>     >     lambda {@audience.stats = ''Market
Goblin''}.should raise_error
>     >   end
>     >
>     > I''ve seen lambda before but not sure what it does.
>
>     A lambda in ruby is like a block or a Proc.  There are some
>     differences
>     between them, but for this simple use you can just think of it as a
>     block of code that will be passed to the
''raise_error'' matcher
>     that then
>     runs that block of code checking to see if an Exception is raised when
>     it is ran.  You can also pass in the specific exception type to be
>     more
>     specific.
>
>     As  a personal preference I like to alias lambda to
''running'' in my
>     spec_helper.rb... I think this reads a lot better:
>     running {@audience.stats = ''Market Goblin''}.should
raise_error
>
>     For more on lambdas refer to the pickaxe.  If you want more detailed
>     information of the subtle differences between them, Procs, blocks, and
>     methods check this out:
>     http://innig.net/software/ruby/closures-in-ruby.rb
>
>     -Ben
>
>
>     _______________________________________________
>     rspec-users mailing list
>     rspec-users at rubyforge.org <mailto:rspec-users at
rubyforge.org>
>     http://rubyforge.org/mailman/listinfo/rspec-users
>
>
> ------------------------------------------------------------------------
>
> _______________________________________________
> rspec-users mailing list
> rspec-users at rubyforge.org
> http://rubyforge.org/mailman/listinfo/rspec-users

Andrew WC Brown

2008-Jan-30 05:37 UTC

head link

[rspec-users] catching errors, rspec basics

lawl, David has been out of the loop a few e-mails.I left in an extra line.

Thanks for the expansion Ben, adds much more clarity,

On Jan 29, 2008 8:03 PM, David Chelimsky <dchelimsky at gmail.com> wrote:
> On Jan 29, 2008 6:55 PM, Andrew WC Brown <omen.king at gmail.com>
wrote:
> > try it, does the same thing =''(
>
> Shouldn''t be the exact same thing. What''s the whole
error?
>
> Also - what version of rspec? If trunk, do you have the latest (3268)?
>
> >
> >
> >
> > On Jan 29, 2008 7:49 PM, Shane Mingins <smingins at elctech.com>
wrote:
> > >
> > > Are you looking for something like this
> > >
> > >
> > > lambda { @audience.stats = ''Market Goblin''
}.should raise_error
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > On 30/01/2008, at 1:48 PM, Andrew WC Brown wrote:
> > >
> > >
> > >
> > >
> > >
> > >
> > > Trying to spec the following but don''t know if
I''m using the right
> > matcher.
> > > How do I spec? Plz, sugar on tops.
> > >
> > >
> > > Audience.stats
> > > - should have a stats of 80 when passed a flux of 10
> > > - should return an error when passed a string (ERROR - 1)
> > >
> > >
> > > 1)
> > > TypeError in ''Audience.stats should return an error when
passed a
> string''
> > > String can''t be coerced into Fixnum
> > > ./audience.rb:11:in `*''
> > > ./audience.rb:11:in `stats=''
> > > ./audience_spec.rb:29:
> > >
> > >
> > > Finished in 0.006333 seconds
> > >
> > >
> > > 2 examples, 1 failure
> > > monsterbox:spec andrew_wc_brown$
> > >
> > >
> > >
> > >
> > >
> > >
> > > class Audience
> > >
> > >   attr_accessor :stats
> > >
> > >   def initialize(name = nil,value = nil)
> > >     @name ||= ''all''
> > >     @value ||= value
> > >   end
> > >
> > >   def stats=(flux)
> > >     @stats = @value * flux / 0.025
> > >   end
> > >
> > >
> > >   def market_share
> > >     "The Market share is for #{@name} at a high of
#{@stats}"
> > >   end
> > >
> > > end
> > >
> > >
> > > describe "Audience.stats" do
> > >
> > > before :all do
> > >   @audience = Audience.new(nil,20)
> > > end
> > >
> > >   it  "should have a stats of 80 when passed a flux of
10" do
> > >     @audience.stats = 10
> > >     @audience.stats.should == 8000
> > >   end
> > >
> > >   it "should return an error when passed a string" do
> > >     @audience.stats = ''Market Goblin''
> > >     @audience.stats.should raise_error
> > >   end
> > > end
> > > _______________________________________________
> > > rspec-users mailing list
> > > rspec-users at rubyforge.org
> > > http://rubyforge.org/mailman/listinfo/rspec-users
> > >
> > >
> > >
> > >
> > >
> > > _______________________________________________
> > > rspec-users mailing list
> > > rspec-users at rubyforge.org
> > > http://rubyforge.org/mailman/listinfo/rspec-users
> > >
> >
> >
> > _______________________________________________
> > rspec-users mailing list
> > rspec-users at rubyforge.org
> > http://rubyforge.org/mailman/listinfo/rspec-users
> >
> _______________________________________________
> rspec-users mailing list
> rspec-users at rubyforge.org
> http://rubyforge.org/mailman/listinfo/rspec-users
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