TPT User's Guide - PikeTec

Page 84 TPT User’s Guide
15.8.1 First column – Object overview
The first column contains a tree, which shows the hierarchy of all the testlets, transitions and
paths in this order. Each object has the two nodes “variants”, which lists all the variants of an
object, and “pairs”, which contains a list of all other testlets, transitions and paths.
A completely opened testlet-node can be seen in Figure 60, number 1.
15.8.2 Second column - Amount
The second column simply displays the amount how often a testlet and its states were used in
all scenarios. The percentage can be read of the size of the bar, which relates to the total
number of scenarios (see Figure 60, number 2).
15.8.3 Third column – Spreading of variants
To see whether tests are distributed well TPT analyses the coverage of all states in a single
testlet. Therefore TPT calculates the “distance” between the current spreading and the optimal
possible arrangement with the amount of the testlet.
The example (see Figure 60 number 2/3) shows that the testlet ”changing light intensity” is
used six times. In detail: one state is used four times; the second two times and the three
remaining are never used. The optimal arrangement with five states and six available would be
one state two times and every other state once.
Similar to the process of standard deviation TPT calculates in this case a value of 2.8. The
appropriated green bar relates to the worst calculated value of all objects.
15.8.4 Fourth column – Spreading of combinations
To evaluate the coverage it is also important to consider the combinations of two objects. To
realize the importance an example: two testlets can be good in the sense of the second column
but state 1 of testlet A is only used with state 2 of testlet B. To cover such problems TPT also
calculate a value for the combinations of objects.
The relation between two objects and its variants can be described by a matrix which contains
the amounts of a state in combination with every other variant. Similar to the spreading of
variants TPT calculates the “distance” between this matrix and the best possible distributed
matrix with the same total amount. This value is now called the distance between two objects
(see Figure 60, number 5).
Out of all the distances the average distance of a testlet is made and shown in the fourth
column (see Figure 60, number 4). The bar again is related to the biggest distance between two
objects. In addition the blue line over the bar shows the minimum and maximum distance from
this testlet.
15.9 Restore from history
TPT automatically saves a copy of the currently open file at regular intervals if it has been
changed. A backup is created every five minutes by default or when the user saves the file
manually. By default a total of twenty backups are kept and may be restored.
To restore a backup, use the menu item File | Restore From History. There, you will
find an overview, listing all saved backup files along with their backup time and information
about whether the save operation has been performed manually or automatically. To restore a
backup file, select the desired backup time in the list and use the “Restore” button.