junit-json-params

A Junit 5 library to provide annotations that load data from JSON Strings or files in parameterized tests.

Project Info

Project site

Installation

Apache Maven

<dependencies>
    <dependency>
        <groupId>net.joshka</groupId>
        <artifactId>junit-json-params</artifactId>
        <version>5.9.3-r0</version>
    </dependency>
    <dependency>
        <groupId>org.eclipse.parsson</groupId>
        <artifactId>parsson</artifactId>
        <version>1.1.1</version>
    </dependency>
</dependencies>

Gradle

testImplementation 'net.joshka:junit-json-params:5.9.3-r0'
testImplementation 'org.eclipse.parsson:parsson:1.1.1'

Examples

@JsonSource

@JsonSource allows you to specify argument lists as JSON strings.

See JsonArgumentsProviderTest

import net.joshka.junit.json.params.JsonSource;

class JsonArgumentsProviderTest {
    /**
     * When passed <code>{"key":"value"}</code>, is executed a single time
     * @param object the parsed JsonObject
     */
    @ParameterizedTest
    @JsonSource("{\"key\":\"value\"}")
    @DisplayName("provides a single object")
    void singleObject(JsonObject object) {
        assertThat(object.getString("key")).isEqualTo("value");
    }

    /**
     * When passed <code>[{"key":"value1"},{"key","value2"}]</code>, is
     * executed once per element of the array
     * @param object the parsed JsonObject array element
     */
    @ParameterizedTest
    @JsonSource("[{\"key\":\"value1\"},{\"key\":\"value2\"}]")
    @DisplayName("provides an array of objects")
    void arrayOfObjects(JsonObject object) {
        assertThat(object.getString("key")).startsWith("value");
    }

    /**
     * When passed <code>[1, 2]</code>, is executed once per array element
     * @param number the parsed JsonNumber for each array element
     */
    @ParameterizedTest
    @JsonSource("[1,2]")
    @DisplayName("provides an array of numbers")
    void arrayOfNumbers(JsonNumber number) {
        assertThat(number.intValue()).isGreaterThan(0);
    }

    /**
     * When passed <code>["value1","value2"]</code>, is executed once per array
     * element
     * @param string the parsed JsonString for each array element
     */
    @ParameterizedTest
    @JsonSource("[\"value1\",\"value2\"]")
    @DisplayName("provides an array of strings")
    void arrayOfStrings(JsonString string) {
        assertThat(string.getString()).startsWith("value");
    }

    /**
     * When passed <code>{'key':'value'}</code>, is executed a single time.
     * This simplifies writing inline JSON strings
     * @param object the parsed JsonObject
     */
    @ParameterizedTest
    @JsonSource("{'key':'value'}")
    @DisplayName("handles simplified json")
    void simplifiedJson(JsonObject object) {
        assertThat(object.getString("key")).isEqualTo("value");
    }
}

@JsonFileSource

@JsonFileSource lets you use JSON files from the classpath. It supports single objects and arrays of objects and JSON primitives (numbers and strings).

See JsonFileArgumentsProviderTest

import net.joshka.junit.json.params.JsonFileSource;

class JsonFileArgumentsProviderTest {
    /**
     * When passed <code>{"key":"value"}</code>, is executed a single time
     * @param object the parsed JsonObject
     */
    @ParameterizedTest
    @JsonFileSource(resources = "/single-object.json")
    @DisplayName("provides a single object")
    void singleObject(JsonObject object) {
        assertThat(object.getString("key")).isEqualTo("value");
    }

    /**
     * When passed <code>[{"key":"value1"},{"key","value2"}]</code>, is
     * executed once per element of the array
     * @param object the parsed JsonObject array element
     */
    @ParameterizedTest
    @JsonFileSource(resources = "/array-of-objects.json")
    @DisplayName("provides an array of objects")
    void arrayOfObjects(JsonObject object) {
        assertThat(object.getString("key")).startsWith("value");
    }

    /**
     * When passed <code>[1, 2]</code>, is executed once per array element
     * @param number the parsed JsonNumber for each array element
     */
    @ParameterizedTest
    @JsonFileSource(resources = "/array-of-numbers.json")
    @DisplayName("provides an array of numbers")
    void arrayOfNumbers(JsonNumber number) {
        assertThat(number.intValue()).isGreaterThan(0);
    }

    /**
     * When passed <code>["value1","value2"]</code>, is executed once per array
     * element
     * @param string the parsed JsonString for each array element
     */
    @ParameterizedTest
    @JsonFileSource(resources = "/array-of-strings.json")
    @DisplayName("provides an array of strings")
    void arrayOfStrings(JsonString string) {
        assertThat(string.getString()).startsWith("value");
    }
}

License

Copyright ©️ 2019-2022 Joshua McKinney

Code is under the Apache License 2.0