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New to unit testing, how to write great tests? [closed]
...the tests must too.
Testing should not be literally testing that function foo invoked function bar 3 times. That is wrong. Check if the result and side-effects are correct, not the inner mechanics.
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What are the reasons why Map.get(Object key) is not (fully) generic
... I have never once wanted to check membership in a Set<? extends Foo>. I have very frequently changed the key type of a map and then been frustrated that the compiler could not find all the places where the code needed updating. I am really not convinced that this is the correct trade...
When and how should I use a ThreadLocal variable?
...ve each thread its own instance of the object.
For example:
public class Foo
{
// SimpleDateFormat is not thread-safe, so give one to each thread
private static final ThreadLocal<SimpleDateFormat> formatter = new ThreadLocal<SimpleDateFormat>(){
@Override
protec...
How do I prevent a Gateway Timeout with FastCGI on Nginx
...ing purposes and might be dangerous in a production environment.
upstream foo_server {
server 127.0.0.1:3000 fail_timeout=0;
}
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Pandas: Looking up the list of sheets in an excel file
...e the ExcelFile class (and the sheet_names attribute):
xl = pd.ExcelFile('foo.xls')
xl.sheet_names # see all sheet names
xl.parse(sheet_name) # read a specific sheet to DataFrame
see docs for parse for more options...
...
How to check if an object is a list or tuple (but not string)?
...inside another list; but for strings we would rather have them printed as "foo" than as <'f', 'o', 'o'>. So an explicit check for a string makes good sense here. Also, there really aren't any other examples of data types where iterating always returns an iterable and recursion will always ca...
Passing multiple error classes to ruby's rescue clause in a DRY fashion
...
You can use an array with the splat operator *.
EXCEPTIONS = [FooException, BarException]
begin
a = rand
if a > 0.5
raise FooException
else
raise BarException
end
rescue *EXCEPTIONS
puts "rescued!"
end
If you are going to use a constant for the array as above (wi...
Java Synchronized Block for .class
... of its body, then we synchronized(this) is not good, instead synchronized(Foo.class) is appropriate. Is that right?
– krupal.agile
May 15 '19 at 13:37
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Are there any SHA-256 javascript implementations that are generally considered trustworthy?
...de-forge, but now, how to use the library do create a hash from the string foo?
– user
Sep 17 '19 at 17:48
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How to vertically align an image inside a div
.../edit?html,css,output
HTML:
<div class="frame">
<img src="foo"/>
</div>
CSS:
.frame {
height: 160px; /* Can be anything */
width: 160px; /* Can be anything */
position: relative;
}
img {
max-height: 100%;
max-width: 100%;
width: auto;
height: ...