\begin{vdm_al}
--The class \vdmstyle{TestResult} maintains a collection
--of references to test cases that have failed. The
--exception handler defined in the operation \vdmstyle{Run}
--of class \vdmstyle{TestCase} calls the operation
--\vdmstyle{AddResult}, which will append the object
--reference of the test case to the tail of the sequence
--\vdmstyle{failures}. The operation \vdmstyle{Show} is used
--to print a list of test cases that have failed or
--provide a message to indicate that no failures were
--found. Note that the standard I/O library, which is
--supplied with \vdmtools, is used here. \vdmstyle{IO.echo}
--prints a string on the standard output, just like
--\vdmstyle{System.out.println} in Java. The \emph{def
--statement} is used to suppress the boolean value
--returned by \vdmstyle{IO.echo}:\sindex{IO standard library}
class TestResult
instance variables
failures : seq of TestCase := []
operations
public AddFailure: TestCase ==> ()
AddFailure (ptst) == failures := failures ^ [ptst];
public Print: seq of char ==> ()
Print (pstr) ==
def - = new IO().echo(pstr ^ "\n") in skip;
public Show: () ==> ()
Show () ==
if failures = [] then
Print ("No failures detected")
else
for failure in failures do
Print (failure.GetName() ^ " failed")
end TestResult
\end{vdm_al}
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