Added initial development test.

Brought into line with new data provider structure.

Updated to more comprehensively reflect the specified requirements. Also tweaked some data types.

Fixed typo in output.

Removed Suppliers_Code from Assembly and Order_line tables and data fixtures.

- Fixed length of phone numbers in test data. ...

- Brought into line with new data provider structure.

Added some legal phone numbers.

- Brought into line with new data provider structure. ...

- Stripped out irrelevant tests.

Ensured that maximum and minimum column length assertions are only asserted where actually relevant.

Rewrote provideColumnLengths() to return fixed rather than variable-length result.

- Switched to new (il)legal value tests.

- Improved descriptive output. ...

- Added sqlifyValue function to improve flexibility of SQL string handling.
- Renamed 'type' property to 'sql_type'.
- Added 'generic_type' property.
- Improved testing of legal and illegal values.

- Split Order_line testing into "structure" and "data" tests. ...

- Modified Phone attribute test values (Staff, Supplier).
- Changed lower bound on Qty_Ordered to 1.
- Added lower bound constraint to Qty_Received.

- Split Order_head testing into "structure" and "data" tests. ...

- Modified Phone attribute test values (Staff, Supplier).
- Modified Due_Date attribute to NOT NULL.

- Split Sale_line testing into "structure" and "data" tests. ...

- Modified Phone attribute test values (Staff, Customer).
- Reduced Quantity attribute length to 4.

Added preliminary output based on whether an illegal value is rejected by a constraint or an actual overflow.

- Split Sale_head testing into "structure" and "data" tests. ...

- Modified Phone attribute test values (Staff, Customer).

- Split Assembly testing into "structure" and "data" tests. ...

- Modified Phone attribute test values (Supplier).

- Split Component testing into "structure" and "data" tests. ...

- Modified Phone attribute test values (Supplier).

Split Product testing into structure and data tests.

- Split Supplier testing into "structure" and "data" tests. ...

- Modified Phone attribute test values.

- Split Customer testing into "structure" and "data" tests. ...

- Modified Phone attribute test values.

Split Staff testing into separate "structure" and "data" tests.

- Slightly tidier printing of messages involving plurals. ...

- Now properly handles both "check constraint violated" and "value larger than specified precision" errors.

Added empty data fixture for structure-only testing.

Added experimental unit testing code.