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Added example for custom expectation-fail message in docs #486

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jgebal merged 2 commits into from
Sep 29, 2017
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Added example for custom expectation-fail message in docs #486

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Added example for custom expectation-fail message
pesse Sep 28, 2017
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Added example for custom expectation-fail message 
Fixes #485
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@pesse
pesse authored Sep 28, 2017
commit 4381f756aac6b31601f2c2e208750a91b625ea74
52 changes: 52 additions & 0 deletions docs/userguide/expectations.md
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Expand Up @@ -471,3 +471,55 @@ end;
```
Since NULL is neither *true* nor *not true*, both expectations will report failure.

# Provide a custom error message
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@jgebal jgebal Sep 29, 2017

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To be consistent with the rest of document please change that to: Adding custom failure message

Expectations allow you to provide a custom error message as second argument:
````sql
ut.expect( a_actual {data-type}, 'custom error message if expectation fails' ).to_{matcher};
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@jgebal jgebal Sep 29, 2017

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Can you replace the 'error message' with 'failure message' or just 'custom message'.
There is a difference between error and failure as we define errored test as a test procedure that raised an unhandled exception.

````
The message is added to the normal error message returned by the matcher.

This is not only useful to give more detailed and specific information about a test, but also if you have some kind of dynamic tests.

## Dynamic tests example
You have a bunch of tables and an archive-functionality for them and you want to test if the things you put into live-tables are removed from live-tables and present in archive-tables:

````sql
procedure test_data_existance( i_tableName varchar2 )
as
v_count_real integer;
v_count_archive integer;
begin

execute immediate 'select count(*) from ' || i_tablename || '' into v_count_real;
execute immediate 'select count(*) from ' || i_tablename || '_archive' into v_count_archive;

ut.expect( v_count_archive, 'error checking entry-count of ' || i_tablename || '_archive' ).to_( equal(1) );
ut.expect( v_count_real, 'error checking entry-count of ' || i_tablename ).to_( equal(0) );

end;

procedure test_archive_data
as
begin
-- Arrange
-- insert several data into real-tables here

-- Act
package_to_test.archive_data();

-- Assert
test_data_existance('TABLE_A');
test_data_existance('TABLE_B');
test_data_existance('TABLE_C');
test_data_existance('TABLE_D');
end;
````
A failed output will look like this:
````
Failures:

1) test_archive_data
"error checking entry-count of TABLE_A_archive"
Actual: 2 (number) was expected to equal: 1 (number)
at "UT_TEST_PACKAGE.TEST_DATA_EXISTANCE", line 12 ut.expect( v_count_archive, 'error checking entry-count of ' || i_tablename || '_archive' ).to_( equal(1) );
````