This commit introduces new `isEmpty()` and `isNotEmpty()` methods in
`JsonPathResultMatchers` and `JsonPathRequestMatchers` which delegate
to the new `assertValueIsEmpty()` and `assertValueIsNotEmpty()` methods
in `JsonPathExpectationsHelper`, respectively.
Issue: SPR-13352
Commit fffdd1e9e9 introduced additional
JsonPath result matchers in JsonPathResultMatchers for server-side
testing of MVC controllers.
This commit introduces comparable methods in JsonPathRequestMatchers
for client-side testing with a RestTemplate.
- isString()
- isBoolean()
- isNumber()
- isMap()
Issue: SPR-13320
Prior to this commit, the exists() method in JsonPathExpectationsHelper
correctly asserted that the evaluated JsonPath expression resulted in a
value (i.e., that a non-null value exists); however, if the value was
an empty array, the exists() method always threw an AssertionError.
The existing behavior makes sense if the JsonPath expression is
'indefinite' -- for example, if the expression uses a filter to select
results based on a predicate for which there is no match in the JSON
document, but the existing behavior is illogical and therefore invalid
if the JsonPath expression is 'definite' (i.e., directly references an
array in the JSON document that exists but happens to be empty). For
example, prior to this commit, the following threw an AssertionError.
new JsonPathExpectationsHelper("$.arr").exists("{ 'arr': [] }");
Similar arguments can be made for the doesNotExist() method.
After thorough analysis of the status quo, it has become apparent that
the existing specialized treatment of arrays is a result of the fact
that the JsonPath library always returns an empty list if the path is
an 'indefinite' path that does not evaluate to a specific result.
Consult the discussion on "What is Returned When?" in the JsonPath
documentation for details:
https://github.com/jayway/JsonPath#what-is-returned-when
This commit addresses these issues by ensuring that empty arrays are
considered existent if the JsonPath expression is definite but
nonexistent if the expression is indefinite.
Issue: SPR-13351
Prior to this commit, a JsonPath assertion that a path expression
evaluated to an array in JsonPathExpectationsHelper (and therefore
indirectly in JsonPathResultMatchers in Spring MVC Test) would
incorrectly fail if the array was present in the JSON content but empty.
This commit fixes this issue by removing the "not empty" check for
arrays and lists.
Issue: SPR-13320
SocketUtils is used to find available ports on localhost; however,
prior to this commit, SocketUtils incorrectly reported a port as
available on localhost if another process was already bound to
localhost on the given port but not to other network interfaces. In
other words, SocketUtils determined that a given port was available for
some interface though not necessarily for the loopback interface.
This commit addresses this issue by refactoring SocketUtils so that it
tests the loopback interface to ensure that the port is actually
available for localhost.
Issue: SPR-13321
