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Test business logic: Don't forget to test the business logic that your provider should enforce. Business logic includes handling of invalid values, financial or arithmetic calculations, elimination or combining of duplicates, and so forth. A content provider does not have to have business logic, because it may be implemented by activities that modify the data. If the provider does implement business logic, you should test it. premopak fan labelsa

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Design and Testing

Content Provider Design and Testing

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In Android, content providers are viewed externally as data APIs that provide tables of data, with their internals hidden from view. A content provider may have many public constants, but it usually has few if any public methods and no public variables. This suggests that you should write your tests based only on the provider's public members. A content provider that is designed like this is offering a contract between itself and its users.
The base test case class for content providers, ProviderTestCase2, allows you to test your content provider in an isolated environment. Android mock objects such as IsolatedContext and MockContentResolver also help provide an isolated test environment.
As with other Android tests, provider test packages are run under the control of the test runner InstrumentationTestRunner. The section Running Tests With InstrumentationTestRunner describes the test runner in more detail. The topic Testing From Eclipse with ADT shows you how to run a test package in Eclipse, and the topic Testing From Other IDEs shows you how to run a test package from the command line

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ProviderTestCase2

ProviderTestCase2

You test a provider with a subclass of ProviderTestCase2. This base class extends AndroidTestCase, so it provides the JUnit testing framework as well as Android-specific methods for testing application permissions. The most important feature of this class is its initialization, which creates the isolated test environment.
The initialization is done in the constructor for ProviderTestCase2, which subclasses call in their own constructors. The ProviderTestCase2 constructor creates an IsolatedContext object that allows file and database operations but stubs out other interactions with the Android system. The file and database operations themselves take place in a directory that is local to the device or emulator and has a special prefix.
The constructor then creates a MockContentResolver to use as the resolver for the test. The MockContentResolver class is described in detail in the section Mock object classes.
Lastly, the constructor creates an instance of the provider under test. This is a normal ContentProvider object, but it takes all of its environment information from the IsolatedContext, so it is restricted to working in the isolated test environment. All of the tests done in the test case class run against this isolated object.

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