visual studio 2012 - For unit tests written in F# with mstest in vs2012, how do I assert that an exception is raised? -

-

i'm writing unit tests in f# using mstest, , i'd write tests assert exception raised. 2 methods can find doing either (1) write tests in c# or (2) don't use mstest, or add test package, xunit, on top of it. neither of these option me. thing can find on in msdn docs, omits f# examples.

using f# , mstest, how assert particular call raises particular exception?

mstest has expectedexceptionattribute can used, less ideal way test exception has been thrown because doesn't let assert specific call should throw. if method in test method throws expected exception type, test passes. can bad commonly used exception types invalidoperationexception. use mstest lot , have throws helper method in our own asserthelper class (in c#). f# let put assert module appears other assert methods in intellisense, pretty cool:

namespace fsharptestspike  open system open microsoft.visualstudio.testtools.unittesting  module assert =    let throws<'a> f =     let mutable wasthrown = false     try       f()         | ex -> assert.areequal(ex.gettype(), typedefof<'a>, (sprintf "actual exception: %a" ex)); wasthrown <- true      assert.istrue(wasthrown, "no exception thrown")  [<testclass>] type mytestclass() =         [<testmethod>]   member this.``expects exception , thrown``() =     assert.throws<invalidoperationexception> (fun () -> invalidoperationexception() |> raise)    [<testmethod>]   member this.``expects exception , not thrown``() =     assert.throws<invalidoperationexception> (fun () -> ())    [<testmethod>]   member this.``expects invalidoperationexception , different 1 thrown``() =     assert.throws<invalidoperationexception> (fun () -> exception("boom!") |> raise)

Comments

Post a Comment

Popular posts from this blog

c# - How Configure Devart dotConnect for SQLite Code First? -

-
can configure following sample code ? when run following code, error : no entity framework provider found ado.net provider invariant name 'devart.data.sqlite' setting in machine.config <system.data> <dbproviderfactories> <add name="dotconnect sqlite" invariant="devart.data.sqlite" description="devart dotconnect sqlite" type="devart.data.sqlite.sqliteproviderfactory, devart.data.sqlite, version=4.6.287.0, culture=neutral, publickeytoken=09af7300eec23701" /> </dbproviderfactories> </system.data> after add below block code in app.config <?xml version="1.0"?> <configuration>   <configsections> <!-- more information on entity framework configuration, visit http://go.microsoft.com/fwlink/?linkid=237468 --> <section name="entityframework" type="system.data.entity.internal.configfile.entityframeworksection, entit...
Read more

java - Copying object fields -

-
what best way of copying classes when need have 2 independent variables? have simple class: public class myclass { boolean = false; string b= "not empty"; } do need make method : assign(myclass data ) { a= data.a; b= data.b; } is there automatic method copy (duplicate) objects in java? do need make method : pretty close. instead of making method, should make constructor. such constructors called copy constructor , , create them this: myclass(myclass data) { = data.a; b = data.b; } and create copy of instance, use constructor this: myclass obj1 = new myclass(); myclass obj2 = new myclass(obj1); copy constructor can tedious : using copy constructor create deep-copy can tedious, when class has mutable fields. in case, assignment create copy of reference, , not object itself. have create copy of fields (if want deep copy). can go recursive. a better way create deep copy serialize , deserialize object. why not use clone()? ...
Read more

c++ - Clear the memory after returning a vector in a function -

-
i have function processes , stores lot of data in , returns results vector of class. amount of data stored in function tremendous , want clear storage memory of function after finished job. necessary (does function automatically clear memory) or should clear memory function? update: vector<customers> process(char* const *filename, vector<int> id) { vector<customers> list_of_customers; (perform actions) return list_of_customers; } variables defined locally within function automatically released @ end of function scope. destructors objects called, should free memory allocated objects (if objects coded correctly). example of such object std::vector . anything you've allocated new must have corresponding delete release storage. try avoid doing own allocation , use raii instead, i.e. containers or smart pointers.
Read more