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Aug 26, 2016 · Assert allows you to assert a condition (post or pre) applies in your code. It's a way of documenting your intentions and having the debugger inform you with a dialog if your intention is not met. Unlike a breakpoint, the Assert goes with your code and can be used to add additional detail about your intention.
- Definition
- Assert(Boolean)
- Assert(Boolean, Debug+AssertInterpolatedStringHandler)
- Assert(Boolean, String)
- Assert(Boolean, Debug+AssertInterpolatedStringHandler, Debug+AssertInterpolatedStringHandler)
- Assert(Boolean, String, String)
- Assert(Boolean, String, String, Object[])
Namespace: System.Diagnostics
Assembly: System.Diagnostics.Debug.dll
Assembly: System.Runtime.dll
Assembly: System.dll
Assembly: netstandard.dll
Checks for a condition; if the condition is false, outputs messages and displays a message box that shows the call stack.
Checks for a condition; if the condition is false, displays a message box that shows the call stack. Public Shared Sub Assert (condition As Boolean) Parameters
condition Boolean
The conditional expression to evaluate. If the condition is true, a failure message is not sent and the message box is not displayed.
Attributes
Checks for a condition; if the condition is false, outputs a specified message and displays a message box that shows the call stack. Public Shared Sub Assert (condition As Boolean, ByRef message As Debug.AssertInterpolatedStringHandler) Parameters
condition Boolean
The conditional expression to evaluate. If the condition is true, the specified message is not sent and the message box is not displayed.
message Debug.AssertInterpolatedStringHandler
The message to send to the Listeners collection.
Attributes
Checks for a condition; if the condition is false, outputs a specified message and displays a message box that shows the call stack. [ ] static member Assert : bool * string -> unit Public Shared Sub Assert (condition As Boolean, message As String) Parameters
condition Boolean
The conditional expression to evaluate. If the condition is true, the specified message is not sent and the message box is not displayed.
message String
The message to send to the Listeners collection.
Attributes
Checks for a condition; if the condition is false, outputs a specified message and displays a message box that shows the call stack. Public Shared Sub Assert (condition As Boolean, ByRef message As Debug.AssertInterpolatedStringHandler, ByRef detailMessage As Debug.AssertInterpolatedStringHandler) Parameters
condition Boolean
The conditional expression to evaluate. If the condition is true, the specified message is not sent and the message box is not displayed.
message Debug.AssertInterpolatedStringHandler
The message to send to the Listeners collection.
detailMessage Debug.AssertInterpolatedStringHandler
Checks for a condition; if the condition is false, outputs two specified messages and displays a message box that shows the call stack. [ ] static member Assert : bool * string * string -> unit static member Assert : bool * string * string -> unit Public Shared Sub Assert (condition As Boolean, message As String, detailMessage As String) Parameters
condition Boolean
The conditional expression to evaluate. If the condition is true, the specified messages are not sent and the message box is not displayed.
message String
The message to send to the Listeners collection.
detailMessage String
Checks for a condition; if the condition is false, outputs two messages (simple and formatted) and displays a message box that shows the call stack. [ ] static member Assert : bool * string * string * obj[] -> unit static member Assert : bool * string * string * obj[] -> unit Public Shared Sub Assert (condition As Boolean, message As String, detailMessageFormat As String, ParamArray args As Object()) Parameters
condition Boolean
The conditional expression to evaluate. If the condition is true, the specified messages are not sent and the message box is not displayed.
message String
The message to send to the Listeners collection.
detailMessageFormat String
Apr 12, 2009 · Assert.Throws<NullReferenceException>(() => someNullObject.ToString()); And Assert.Catch, which will test for an exception of a given type, or an exception type derived from this type: Assert.Catch<Exception>(() => someNullObject.ToString());
- I have a couple of different patterns that I use. I use the ExpectedException attribute most of the time when an exception is expected. This suffic...
- Now, 2017, you can do it easier with the new MSTest V2 Framework : Assert.ThrowsException (() => myClass.MyMethodWithError()); //async version awa...
- Edit : MS Test Framework belatedly has copied other Unit test frameworks and does now have Assert.ThrowsException and Assert.ThrowsExceptionAsync...
- I'm new here and don't have the reputation to comment or downvote, but wanted to point out a flaw in the example in Andy White's reply : try { So...
- Unfortunately MSTest STILL only really has the ExpectedException attribute (just shows how much MS cares about MSTest) which IMO is pretty awful be...
- As an alternative to using ExpectedException attribute, I sometimes define two helpful methods for my test classes: AssertThrowsException() takes a...
- Mark the test with the ExpectedExceptionAttribute (this is the term in NUnit or MSTest; users of other unit testing frameworks may need to translate).
- With most .net unit testing frameworks you can put an [ExpectedException] attribute on the test method. However this can't tell you that the except...
- Suggest using NUnit 's clean delegate syntax. Example for testing ArgumentNullExeption : [Test] [TestCase(null)] public void FooCalculation_Invalid...
Jan 2, 2020 · Assertions should only be used to verify conditions that should be logically impossible to be false (read: sanity checks). These conditions should only be based on inputs generated by your own code. Any checks based on external inputs should use exceptions.
Jun 25, 2024 · Assertions are a powerful tool in C# development for validating assumptions and ensuring the correctness of code. In this blog post, we will dive deep into the world of C# assert statements, covering best practices and providing practical examples to help you leverage this feature effectively.
Use the Assert classes of the Microsoft.VisualStudio.TestTools.UnitTesting namespace to verify specific functionality. A unit test method exercises the code of a method in your application's code, but it reports the correctness of the code's behavior only if you include Assert statements.
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Apr 5, 2022 · Instead of placing breakpoints all over your code to manually check the application state (or use conditional breakpoints), you can create assertions that break your code only if launched in Debug mode. StringBuilder sb = new StringBuilder(); foreach (var c in Couples) Debug.Assert(c.First + c.Second == 12);
