Programming language: Erlang
License: Apache License 2.0
Tags: Build Tools    
Latest version: v1.3.0

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A rebar3 plugin to enable the execution of Erlang QuickCheck properties


This plugin provides the ability to run all or a subset of the EQC properties defined in a project's applications with a simple rebar3 command. For a property to be found and executed by the plugin it must use the prop_* naming convention and be exported from the module in which it resides. Otherwise, the property name may be given using the --properties option. The number of times each property is executed is configurable as shown in the Configuration and Usage sections below with the default being 100 times. For users of the full version of EQC it is also possible to have each property execute for a certain period of time as opposed to a fixed number of iterations per property.

The plugin takes the approach of executing EQC properties directly as opposed to the common pattern of indirect execution via another test framework. There are still cases where it may be useful to use eunit or common_test for execution of EQC properties, but there are many cases where that is not required.

The plugin scans all source modules for EQC properties. Additionally it looks for standalone EQC properties in a top-level eqc directory.

The default plugin behavior is to execute all properties found in the application source code or the eqc directory. This behavior can be overridden by using the --properties option to specify a comma-separated list of properties to be executed. List entries may be of the form ModuleName:PropertyName or simply PropertyName if the property name is unique within the project. Additionally, as of version 1.1.0 there is a --dir option to override the default test directory location of eqc.

The plugin also has a counterexample mode. When a property fails when run using the plugin a counterexample file is written to an .eqc sub-directory in the project directory. The counterexample files are named for the properties that generate them. This allows for rechecking a set of properties using their respective counterexample files except in cases where a project has properties sharing the same name in different modules. The --properties option may also be used with counterexample mode to recheck a specific property or set of properties.


To install the plugin using the Hex package manaage, add the following to the rebar.config file:

{plugins, [rebar3_eqc]}

Alternatively, to install the plugin from github use the following:

{plugins, [
    {rebar3_eqc, ".*", {git, "https://github.com/kellymclaughlin/rebar3-eqc-plugin.git", {tag, "1.0.0"}}}

To set the number of test executions to 500 instead of the default of 100, add the following rebar.config entry:

{eqc_opts, [{numtests, 500}]}.

To specify that each property execute for 30 seconds, use this entry instead:

{eqc_opts, [{testing_time, 30}]}.

The numtests and testing_time options are mutually exclusive. If both are specified, the testing_time setting is ignored.


To view the plugin usage menu with a full list of options and their descriptions use ./rebar3 help eqc. The following are some example scenarios of plugin usage.

Execute each property the configured number of times or for the configured duration:

./rebar3 eqc

Override the configuration in rebar.config or the default and execute each property 10 times:

./rebar3 eqc -n 10

Similarly, override the configuration in rebar.config or the default and execute each property for 45 seconds:

./rebar3 eqc -t 45

To only execute the property prop_test1 in the module test_module for 1000 iterations use the following:

./rebar3 eqc -n 1000 -p test_module:prop_test1

To execute the same test, but to have the plugin determine the module name use the following:

./rebar3 eqc -n 1000 -p prop_test1