JSONPath with hamcrest hasSize() - citrus-framework

Question

When using the hasSize matcher in the form of #assertThat(hasSize(x))# with a jsonpath expression that returns an array, duplicate values will not be taken into account. Example :
{
"a":[
{
"value1":"ab",
"value2": 2
},
{
"value1":"ab",
"value2":2
}
]
}
If I execute payload().validate("$..value1", "#assertThat(hasSize(2))#") it will result in an error as hasSize will expect a collection of size 1 instead of 2. Is this the desired behavior of the matcher? A workaround would be to use the expression "$.a[?(#.value1)]".

Answer 1

Summary
This is a bug in Citrus. As mentioned in my comment, I have tracked down the bug, see GitHub issue.
I have also fixed the bug and opened a GitHub Pull Request. However, it may take some weeks for my changes to be reviewed by the main Citrus maintainer, since he is currently working on a different project.
I am positive that the fix will be included in the next Citrus maintenance release 2.7.3.
Notes
This bug only occurs if some of the values are duplicate entries, due to a code fragment which uses a Set, which by definition cannot hold duplicate entries.
Example (copied from the GitHub Issue)
{
"test_array": [
{
"key_with_identical_values": "identical_value",
"key_with_unique_values": "unique_value"
},
{
"key_with_identical_values": "identical_value",
"key_with_unique_values": "different_unique_value"
}
]
}
Given the Citrus validation as follows:
<receive endpoint="testServer">
<message type="json">
<validate>
<json-path expression="$..key_with_unique_values" value="#assertThat(hasSize(2))#"/>
<json-path expression="$..key_with_identical_values" value="#assertThat(hasSize(2))#"/>
</validate>
</message>
</receive>
Even though the JSONPath array for both expressions is of size 2 (["unique_value", "different_unique_value"] and ["identical_value", "identical_value"]), the validation will fail for the expression $..key_with_identical_values with the message:
Expected: a collection with size <2>
but: collection size was <1>