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In the absence of a predicate, a stub always matches, and there's never a reason to add more than one stub to an imposter. Predicates allow imposters to have much richer behavior by defining whether or not a stub matches a request.
When multiple stubs are created on an imposter, the first stub that matches is selected. Each predicate object contains one or more of the request fields as keys. Predicates are added to a stub in an array, and all predicates are AND'd together. The following predicate operators are allowed:.
See the equals example below to see the caseSensitive and except parameters in action. See the xpath page for xpath examples. See the jsonpath page for jsonpath examples. Almost all predicates are scoped to a request field; see the protocol pages linked to from the sidebar to see the request fields. It takes a string function that accepts the entire request.
See the injection page for details. The predicates work intuitively for baseencoded binary data as well by internally converting the baseencoded string to a JSON string representing the byte array. This works well for everything but matches , because any regular expression operators get encoded as binary.
In mountebank's experience, contains is the most useful predicate for binary imposters, as even binary RPC data generally contains strings representing method names. On occasion you may encounter multi-valued keys. This can be the case with querystrings and HTTP headers that have repeating keys, for example? In those cases, deepEquals will require all the values in any order to match. All other predicates will match if any value matches, so an equals predicate will match with the value of second in the example above.
When the body contains an array, the logic above still applies: You also have the option of specifying an array in the predicate definition. If you do so, then all fields in the predicate array must match in any order. Most predicates will match even if there are additional fields in the actual request array; deepEquals requires the array lengths to be equal.
The following example shows this with a querystring:. First let's call the imposter matching both keys in the deepEquals predicate. For it to match, no other keys must be present, although the order does not matter. Since both keys match and there are no extraneous keys, we get our expected response from the first stub. If we add a third key not specified by the predicate, it no longer matches the deepEquals predicate. It does, however, match the equals predicate, which supports matching a subset of arrays.
In this case, our third stub matches, because it does not use an array predicate, and one of the actual array values in the request matches the predicate definition.
If he is unable to parse the field, the predicate will fail; otherwise it will pass or fail according to the selected value. The TCP examples use netcat nc to send TCP data over a socket, which is like telnet , but makes the output easier to script. The examples for binary imposters use the base64 command line tool to decode base64 to binary before sending to the socket. The first predicate is the most complex, and the request has to match all of the specified request fields.
We have the option of putting multiple fields under one equals predicate or splitting each one into a separate predicate in the array. In this example, all of the ones that share the default predicate parameters are together. For those, neither the case of the keys nor the values will affect the outcome.
The body predicate is treated separately. The text will be compared in a case-sensitive manner, after stripping away the regular expression! The order of the query parameters and header fields does not matter. The fourth stub will never run, since it matches the same requests as the third stub.
We're sending a baseencoded version of four bytes: Our first predicate is a base64 encoded version of 0x2 and 0x3. The response is a baseencoded version of the string "first response":. The third stub will never run, since it matches the same requests as the second stub.
Let's create a text-based imposter with multiple stubs. Binary imposters won't see any interesting behavior difference with only startsWith predicates:. We'll use the command line base64 tool to decode the request to binary before sending to the imposter. Our first predicate is a base64 encoded version of 0x3 and 0x4. Binary imposters cannot use the matches predicate. The first stub requires a case-sensitive match on a string starting with "first", followed by a non-word character, followed by "second":.
The exists predicate is primarily for object data types, like HTTP headers and query parameters. It works on string fields by simply returning true if the exists value is true and the string if non-empty. Setting the exists value to false inverts the meaning.
The first stub matches if the querystring includes q , but not if it includes search , and if the headers include Accept , but not if they include X-Rate-Limit. The second stub matches if the request method is a non-empty string always true , and if the body is empty.
The following example uses node's Buffer object to decode base64 to a byte array. The first stub matches if the third byte is greater than The request we're sending is an encoding [99, , ]: The logs will also show the injected log output. The second predicate has to match a request originating from localhost with the third byte less than or equal to We're sending [98, 99, ]:.
Predicates In the absence of a predicate, a stub always matches, and there's never a reason to add more than one stub to an imposter. The following predicate operators are allowed: Operator Description equals The request field matches the predicate deepEquals Performs nested set equality on the request field, useful when the request field is an object e.
If false , the request field must not exist. See the injection page for more details. Predicates can be parameterized. Parameter Default Description caseSensitive false Determines if the match is case sensitive or not. This includes keys for objects such as query parameters. The predicate's scope is limited to the selected value in the request field. Matching arrays On occasion you may encounter multi-valued keys.
The following example shows this with a querystring: Sat, 06 May See the json page for json examples. Thu, 09 Jan Sun, 26 Jan The response is a baseencoded version of the string "first response": Fri, 10 Jan Binary imposters won't see any interesting behavior difference with only startsWith predicates: The stub does not match none of the sub-predicates match We're sending [98, 99, ]: Performs nested set equality on the request field, useful when the request field is an object e.
Defines an object containing a selector string.