1. WARNING
20 min
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2. 77577 OR tinyurl.com/answerpost
While you wait for the lecture to start, design test cases for these two methods.
/* Returns true if the name is non-empty and
not null and not longer than 40 chars. */
public boolean isValidName(String name) {
// ... }
/* Throws StorageException if name is not valid
or if name already exists in the database. */
public void saveScore(String name, int score)
throws StorageException {
if (!isValidName(name)) {
throw new StorageException("invalid name");
if (Storage.isFound(name)) {
throw new StorageException("already exists");
Storage.save(name, score);
Test input
Expected
null
false
Test input
Expected
null,0
exception
How many test cases do you have for the saveScore method?
count {answer} e.g. count 9
OR tinyurl.com/answerpost

3. Test input Expected null false Test input Expected null,0 exception
/* Returns true if the name is non-empty and
not null and not longer than 40 chars. */
public boolean isValidName(String name) {
// ... }
/* Throws StorageException if name is not valid
or if name already exists in the database. */
public void saveScore(String name, int score)
throws StorageException {
if (!isValidName(name)) {
throw new StorageException("invalid name");
if (Storage.isFound(name)) {
throw new StorageException("already exists");
Storage.save(name, score);
Test input
Expected
null
false
Test input
Expected
null,0
exception

4. Equivalence partitions
/* Returns true if the name is non-empty and
not null and not longer than 40 chars. */
public boolean isValidName(String name) {
// ... }
Test input
Expected
null
false
Test input
Expected
null
False
“ ”
Length==41
Length==50
Length==40
True
Length==10
Equivalence partition = A group of inputs that are likely to be treated similarly by the SUT.
Equivalence partitions
Values
null
null
empty
“ ”
too long
length = 41
, 50
right size
length = 40, 10

5. Equivalence partitions
/* Throws StorageException if name is not valid
or if name already exists in the database. */
public void saveScore(String name, int score)
throws StorageException {
if (!isValidName(name)) {
throw new StorageException("invalid name"); }
if (Storage.isFound(name)) {
throw new StorageException("already exists");
Storage.save(name, score);
Test input
Expected
null
False
“ ”
Length==41
Length==50
Length==40
True
Length==10
Equivalence partitions
Values
null
null
empty
“ ”
too long
length = 41
, 50
right size
length = 40, 10

6. Any existing name e.g. “existing guy”
/* Throws StorageException if name is not valid
or if name already exists in the database. */
public void saveScore(String name, int score)
throws StorageException {
if (!isValidName(name)) {
throw new StorageException("invalid name"); }
if (Storage.isFound(name)) {
throw new StorageException("already exists");
Storage.save(name, score);
Test input
Expected
“new guy”, 0
success
null , -3
exception
“existing guy”, 5
Eq. partitions
Values
invalid
Any invalid e.g. null
name
exists
Any existing name e.g. “existing guy”
new
Any valid new name e.g. “new guy”
score
any
any

7. Is this a unit test or an integration test?
/* Throws StorageException if name is not valid
or if name already exists in the database. */
public void saveScore(String name, int score)
throws StorageException {
if (!isValidName(name)) {
throw new StorageException("invalid name"); }
if (Storage.isFound(name)) {
throw new StorageException("already exists");
Storage.save(name, score);
Test input
Expected
“new guy”, 0
success
null , -3
exception
“existing guy”, 5
Is this a unit test or an integration test?
Integration tests are choreography tests. They do not test components. They test how well the assembly of components dance together.
If Unit testing , we should use stubs for dependencies isValidName etc.

8. Do we really need to test this method?
/* Throws StorageException if name is not valid
or if name already exists in the database. */
public void saveScore(String name, int score)
throws StorageException {
if (!isValidName(name)) {
throw new StorageException("invalid name"); }
if (Storage.isFound(name)) {
throw new StorageException("already exists");
storage.save(name, score);
Test input
Expected
“new guy”, 0
success
null , -3
exception
“existing guy”, 5
Do we really need to test this method?
Short and simple methods

9. Nearing completion. Gearing up for bigger projects.
Today’s theme ?
Nearing completion. Gearing up for bigger projects.