Testing arrays with lists

Component Testing for Ada

While an expression initializes all the array elements in the same way, you can also initialize each element by using an enumerated list of expressions between brackets "()". In this case, you must specify a value for each array element.

Furthermore, you can precede every element in this list of initial or expected values with the array index of the element concerned followed by the characters "=>". The following example illustrates this form:

ARRAY histo[0..3], init = (0 => 0, 1 => 10, 2 => 100, 3 => 10) ...

 

This form of writing the ARRAY statement has several advantages:

You can also use this form together with the simple form if you follow this rule: once one element has been defined with its array index, you must do the same with all the following elements.

If several elements in an array are to take the same value, specify the range of elements taking this value as follows:

ARRAY histo[0..3], init = ( 0 .. 2 => 10, 3 => 10 ) ...

 

You can also initialize and test multidimensional arrays with a list of expressions, as follows. In this case, the previously mentioned rules apply to each dimension.

ARRAY image, init = (0, 1=>4, others=>(1, 2, others=>100)) ...

 

Example

You can specify a value for all the as yet undefined elements by using the keyword others, as the following example illustrates:

TEST 2

 FAMILY nominal

 ELEMENT

  VAR x1, init = 0, ev = init

  VAR x2, init = SIZE_IMAGE-1, ev = init

  VAR y1, init = 0, ev = init

  VAR y2, init = SIZE_IMAGE-1, ev = init

  ARRAY image, init = (others=>(others=>100)), ev = init

  ARRAY histo, init = 0,

  & ev = (100=>SIZE_IMAGE*SIZE_IMAGE, others=>0)

  VAR status, init ==, ev = 0

  #status = compute_histo(x1, y1, x2, y2, histo);

 END ELEMENT

END TEST

 

Related Topics

Testing variablesTesting arraysTesting an array with pseudo-variablesTesting character arraysTesting large arraysTesting arrays with other arrays