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The Voice of the DBA

Why Don't You Unit Test Code?

First, I'll apologize to those that do use formal, automated tests in advance. I'm not really writing for you, and I'm sure you can teach me more about testing. Perhaps you can comment about how and why you do this, or even write some articles to help others.

For everyone else, why don't you test in a repeatable fashion? Let me know with a comment today.

One thing I've noticed as I've talked DevOps and testing for a number of years is that so many developers agree testing is a good idea, but claim they have no time, no support from management, or no need to repeat tests once code is written. Sometimes I hear all three excuses at the same time. The same people will also admit that they have problems with code at times, and that quality could be improved.

Perhaps it's me, but I've never had my boss sit there and watch me code. He or she doesn't know how I might write code. I certainly write a query, run it, and look at a bunch of rows and see if I think the code is correct. Perhaps I need to run other queries to verify values in the results. However, I could also build a quick test with something like tSQLt, like the one I set up for checking COALESCE that does the same thing. With my unit test, I can run it over and over, modifying the test as I discover new edge cases to validate. Which way do you want to write code?

Even if I have a set of data I need to assemble, it doesn't take much longer for me to write a test, especially when I need to also solve the problem. I find that putting a test together forces me to slow down and think about the rules for my code. Since I need to come up with some result set, building that into a test of some sort is fairly easy and let's me double check how I think data will change. I can then repeat the test over and over as I modify code. I can even grab sample data from production and use that as the basis for my unit test if I need to check a specific entity's values.

I know many things I write in SQL might not be worth a test. Often the simple CRUD queries and basic aggregations aren't things I'd test, but when my query becomes complex, includes APPLY or outer joins, and logic to decide how to filter or format data, wouldn't a unit test make sense? What about if you want to be sure you're processing the correct rows from a large CUBE or ROLLUP operator? Certainly if I'm fixing a bug, writing tests makes sense, at least I think so.

Let me know what you think today.

Steve Jones from SQLServerCentral.com

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Question of the Day

Today's Question (by Steve Jones):

What is returned by this code?

SELECT '1,,,,,,'+$0

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Yesterday's Question of the Day

Yesterday's Question (by Avinash):

When columns with different datatypes are compared in SQL joins or if we assign variables of one datatype with variables of other datatype, then SQL server implicitly converts datatype based on their precedence. If value can't be converted SQL will generate data type conversion error. What will be the output datatype from this code:

DECLARE
    @txt VARCHAR(20),
    @dt  DATETIME,
    @i   INT,
    @bin VARBINARY(20);
SET @txt = '2017-01-01';
SET @dt = '2001-01-01';
SELECT result = @dt + @txt

Answer: datetime

Explanation:

The result is a datetime variable. The precedence will convert the string to a datetime and that is the result.

This can be checked by using this select statemetn at the end and exec.

SELECT result = @dt + @txt
 INTO t;

EXEC sp_help t

Ref: Data Type Precedence - click here


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