Function summarize_missing_values test suite

[HrayrMuradyan]

Plan the summarize_missing_values function test suite.

[stephqwu]

Use cases

1. Input dataframe has non-zero missing values
2. Input dataframe has zero missing values
3. Second argument is one of the accepted enumeration

Edge cases

1. Input dataframe is empty
2. Input dataframe is completely missing values (or missing the maximum amount of values that it is possible to miss)
3. Too few data to create plot type

Erroneous/adversarial input

1. First argument is not a dataframe
2. Second argument is not left as default or an accepted enumeration