# Decision Table
 
| number_of_items | total_cost | delivery_time | cost                   |
|----------------|-----------|--------------|------------------------|
| <= 3            | <= 100     | NEXT_DAY      | 25                     |
| <=3             | <= 100     | SECOND_DAY    | 10                     |
| <= 3            | <= 100     | THIS_WEEK     | number_of_items * 1.50 |
| <= 3            | > 100      | NEXT_DAY      | 35.00                  |
| <= 3            | > 100      | SECOND_DAY    | 15.00                  |
| <= 3            | > 100      | THIS_WEEK     | 10.00                  |
| > 3             | <= 100     | NEXT_DAY      | number_of_items * 6.00 |
| > 3             | <= 100     | SECOND_DAY    | number_of_items * 2.50 |
| > 3             | <= 100     | THIS_WEEK     | 0.00                   |
| > 3             | > 100      | NEXT_DAY      | number_of_items * 7.50 |
| > 3             | > 100      | SECOND_DAY    | number_of_items * 3.50 |
| > 3             | > 100      | THIS_WEEK     | number_of_items * 2.50 |

time take to generate this : 14.20 min (including song selection 😜 )


# Equivalance testing:

## Input parameters:
* number of item
    * Positive integers are the valid values. 
* total cost 
    * Positive numbers are the valid values.
* delivery time 
    * NEXT_DAY , SECOND_DAY and THIS_WEEK are the valid values.


## Equivalance partitions

| Input           | Partition Type | Partition Condition             | Selected Value |
|-----------------|----------------|---------------------------------|----------------|
| number_of_items | Valid          | <= 3                            | 3              |
|                 | Valid          | >  3                            | 4              |
|                 | Invalid        | <= 0                            | -1             |
| total_cost      | Valid          | <= 100                          | 100            |
|                 | Valid          | >  100                          | 101            |
|                 | Invalid        | <  0                            | -2             |
| delivery_time   | Valid          | NEXT_DAY, SECOND_DAY, THIS_WEEK | SECOND_DAY     |
|                 | Invalid        | Null or unsupported value       | null           |

## Test cases

| number_of_items | total_cost | delivery_time | Partition Type   | Expected Outcome                |
|-----------------|------------|---------------|------------------|---------------------------------|
| 3               | 100        | NEXT_DAY      | All Valid        | 25.00                           |
| 3               | 150        | SECOND_DAY    | All Valid        | 15.00                           |
| 4               | 100        | THIS_WEEK     | All Valid        | 0.00                            |
| 4               | 150        | NEXT_DAY      | All Valid        | 30.00                           |
| -1              | 100        | NEXT_DAY      | Invalid Items    | Exception                       |
| 3               | -50        | SECOND_DAY    | Invalid Cost     | Exception                       |
| 3               | 100        | null          | Invalid Delivery | Exception                       |

# Boundary Value

| Input           | Boundaries |
|-----------------|------------|
| number_of_items | -1         |
|                 | 0          |
|                 | 1          |
|                 | 3          |
|                 | 4          |
| total_cost      | -1         |
|                 | 0          |
|                 | 1          |
|                 | 100        |
|                 | 101        |
| delivery_time   | n/a        |