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How to use Annotation Type Theory class of org.junit.experimental.theories package

Best junit code snippet using org.junit.experimental.theories.Annotation Type Theory

Source:DataPoints.java

1package org.junit.experimental.theories;2import static java.lang.annotation.ElementType.FIELD;3import static java.lang.annotation.ElementType.METHOD;4import java.lang.annotation.Retention;5import java.lang.annotation.RetentionPolicy;6import java.lang.annotation.Target;7/**8 * Annotating an array or iterable-typed field or method with &#064;DataPoints9 * will cause the values in the array or iterable given to be used as potential10 * parameters for theories in that class when run with the11 * {@link org.junit.experimental.theories.Theories Theories} runner.12 * <p>13 * DataPoints will only be considered as potential values for parameters for14 * which their types are assignable. When multiple sets of DataPoints exist with15 * overlapping types more control can be obtained by naming the DataPoints using16 * the value of this annotation, e.g. with17 * <code>&#064;DataPoints({"dataset1", "dataset2"})</code>, and then specifying18 * which named set to consider as potential values for each parameter using the19 * {@link org.junit.experimental.theories.FromDataPoints &#064;FromDataPoints}20 * annotation.21 * <p>22 * Parameters with no specified source (i.e. without &#064;FromDataPoints or23 * other {@link org.junit.experimental.theories.ParametersSuppliedBy24 * &#064;ParameterSuppliedBy} annotations) will use all DataPoints that are25 * assignable to the parameter type as potential values, including named sets of26 * DataPoints.27 * <p>28 * DataPoints methods whose array types aren't assignable from the target29 * parameter type (and so can't possibly return relevant values) will not be30 * called when generating values for that parameter. Iterable-typed datapoints31 * methods must always be called though, as this information is not available32 * here after generic type erasure, so expensive methods returning iterable33 * datapoints are a bad idea.34 * 35 * <pre>36 * &#064;DataPoints37 * public static String[] dataPoints = new String[] { ... };38 * 39 * &#064;DataPoints40 * public static String[] generatedDataPoints() {41 *     return new String[] { ... };42 * }43 * 44 * &#064;Theory45 * public void theoryMethod(String param) {46 *     ...47 * }48 * </pre>49 * 50 * @see org.junit.experimental.theories.Theories51 * @see org.junit.experimental.theories.Theory52 * @see org.junit.experimental.theories.DataPoint53 * @see org.junit.experimental.theories.FromDataPoints54 */55@Retention(RetentionPolicy.RUNTIME)56@Target({ FIELD, METHOD })57public @interface DataPoints {58    String[] value() default {};59    Class<? extends Throwable>[] ignoredExceptions() default {};60}...

Source:DataPoint.java

1package org.junit.experimental.theories;2import static java.lang.annotation.ElementType.FIELD;3import static java.lang.annotation.ElementType.METHOD;4import java.lang.annotation.Retention;5import java.lang.annotation.RetentionPolicy;6import java.lang.annotation.Target;7/**8 * Annotating an field or method with &#064;DataPoint will cause the field value9 * or the value returned by the method to be used as a potential parameter for10 * theories in that class, when run with the11 * {@link org.junit.experimental.theories.Theories Theories} runner.12 * <p>13 * A DataPoint is only considered as a potential value for parameters for14 * which its type is assignable. When multiple {@code DataPoint}s exist 15 * with overlapping types more control can be obtained by naming each DataPoint 16 * using the value of this annotation, e.g. with17 * <code>&#064;DataPoint({"dataset1", "dataset2"})</code>, and then specifying18 * which named set to consider as potential values for each parameter using the19 * {@link org.junit.experimental.theories.FromDataPoints &#064;FromDataPoints}20 * annotation.21 * <p>22 * Parameters with no specified source (i.e. without &#064;FromDataPoints or23 * other {@link org.junit.experimental.theories.ParametersSuppliedBy24 * &#064;ParameterSuppliedBy} annotations) will use all {@code DataPoint}s that are25 * assignable to the parameter type as potential values, including named sets of26 * {@code DataPoint}s.27 * 28 * <pre>29 * &#064;DataPoint30 * public static String dataPoint = "value";31 * 32 * &#064;DataPoint("generated")33 * public static String generatedDataPoint() {34 *     return "generated value";35 * }36 * 37 * &#064;Theory38 * public void theoryMethod(String param) {39 *     ...40 * }41 * </pre>42 * 43 * @see org.junit.experimental.theories.Theories44 * @see org.junit.experimental.theories.Theory45 * @see org.junit.experimental.theories.DataPoint46 * @see org.junit.experimental.theories.FromDataPoints47 */48@Retention(RetentionPolicy.RUNTIME)49@Target({FIELD, METHOD})50public @interface DataPoint {51    String[] value() default {};52    Class<? extends Throwable>[] ignoredExceptions() default {};53}...

Source:FromDataPoints.java

1package org.junit.experimental.theories;2import java.lang.annotation.ElementType;3import java.lang.annotation.Retention;4import java.lang.annotation.RetentionPolicy;5import java.lang.annotation.Target;6import org.junit.experimental.theories.internal.SpecificDataPointsSupplier;7/**8 * Annotating a parameter of a {@link org.junit.experimental.theories.Theory9 * &#064;Theory} method with <code>&#064;FromDataPoints</code> will limit the10 * datapoints considered as potential values for that parameter to just the11 * {@link org.junit.experimental.theories.DataPoints DataPoints} with the given12 * name. DataPoint names can be given as the value parameter of the13 * &#064;DataPoints annotation.14 * <p>15 * DataPoints without names will not be considered as values for any parameters16 * annotated with &#064;FromDataPoints.17 * <pre>18 * &#064;DataPoints19 * public static String[] unnamed = new String[] { ... };20 * 21 * &#064;DataPoints("regexes")22 * public static String[] regexStrings = new String[] { ... };23 * 24 * &#064;DataPoints({"forMatching", "alphanumeric"})25 * public static String[] testStrings = new String[] { ... }; 26 * 27 * &#064;Theory28 * public void stringTheory(String param) {29 *     // This will be called with every value in 'regexStrings',30 *     // 'testStrings' and 'unnamed'.31 * }32 * 33 * &#064;Theory34 * public void regexTheory(&#064;FromDataPoints("regexes") String regex,35 *                         &#064;FromDataPoints("forMatching") String value) {36 *     // This will be called with only the values in 'regexStrings' as 37 *     // regex, only the values in 'testStrings' as value, and none 38 *     // of the values in 'unnamed'.39 * }40 * </pre>41 * 42 * @see org.junit.experimental.theories.Theory43 * @see org.junit.experimental.theories.DataPoint44 * @see org.junit.experimental.theories.DataPoints45 */46@Retention(RetentionPolicy.RUNTIME)47@Target(ElementType.PARAMETER)48@ParametersSuppliedBy(SpecificDataPointsSupplier.class)49public @interface FromDataPoints {50    String value();51}...

Source:ParametersSuppliedBy.java

1package org.junit.experimental.theories;2import static java.lang.annotation.ElementType.ANNOTATION_TYPE;3import static java.lang.annotation.ElementType.PARAMETER;4import java.lang.annotation.Retention;5import java.lang.annotation.RetentionPolicy;6import java.lang.annotation.Target;7/**8 * Annotating a {@link org.junit.experimental.theories.Theory Theory} method9 * parameter with &#064;ParametersSuppliedBy causes it to be supplied with10 * values from the named11 * {@link org.junit.experimental.theories.ParameterSupplier ParameterSupplier}12 * when run as a theory by the {@link org.junit.experimental.theories.Theories13 * Theories} runner.14 * 15 * In addition, annotations themselves can be annotated with16 * &#064;ParametersSuppliedBy, and then used similarly. ParameterSuppliedBy17 * annotations on parameters are detected by searching up this heirarchy such18 * that these act as syntactic sugar, making:19 * 20 * <pre>21 * &#064;ParametersSuppliedBy(Supplier.class)22 * public &#064;interface SpecialParameter { }23 * 24 * &#064;Theory25 * public void theoryMethod(&#064;SpecialParameter String param) {26 *   ...27 * }28 * </pre>29 * 30 * equivalent to:31 * 32 * <pre>33 * &#064;Theory34 * public void theoryMethod(&#064;ParametersSuppliedBy(Supplier.class) String param) {35 *   ...36 * }37 * </pre>38 */39@Retention(RetentionPolicy.RUNTIME)40@Target({ ANNOTATION_TYPE, PARAMETER })41public @interface ParametersSuppliedBy {42    Class<? extends ParameterSupplier> value();43}...

Annotation Type Theory

Using AI Code Generation

1public class TestClass {2    public void testMethod(@FromDataPoints("data") int x, @FromDataPoints("data") int y) {3        assertThat(x + y, is(4));4    }5    @DataPoints("data")6    public static int[] data() {7        return new int[]{1, 3};8    }9}10@RunWith(JUnitParamsRunner.class)11public class JUnitParamsTest {12    @Parameters({"1, 3", "2, 2", "3, 1"})13    public void testMethod(int x, int y) {14        assertThat(x + y, is(4));15    }16}17@RunWith(JUnitParamsRunner.class)18public class JUnitParamsTest {19    @Parameters(method = "data")20    public void testMethod(int x, int y) {21        assertThat(x + y, is(4));22    }23    private Object[] data() {24        return new Object[]{25                new Object[]{1, 3},26                new Object[]{2, 2},27                new Object[]{3, 1}28        };29    }30}31@RunWith(JUnitParamsRunner.class)32public class JUnitParamsTest {33    @Parameters(source = DataProvider.class)34    public void testMethod(int x, int y) {35        assertThat(x + y, is(4));36    }37    public static class DataProvider {38        public static Object[] data() {39            return new Object[]{40                    new Object[]{1, 3},41                    new Object[]{2, 2},42                    new Object[]{3, 1}43            };44        }45    }46}47@RunWith(JUnitParamsRunner.class)48public class JUnitParamsTest {49    public void testMethod(int x, int y) {50        assertThat(x + y, is(4));51    }52    private Object parametersForTestMethod() {53        return new Object[]{54                new Object[]{1, 3},55                new Object[]{2, 2},56                new Object[]{3, 1}57        };58    }59}60@RunWith(JUnitParams

Annotation Type Theory

Using AI Code Generation

1import org.junit.experimental.theories.*;2import org.junit.runner.*;3import static org.junit.Assert.*;4import java.util.*;5@RunWith(Theories.class)6public class TheoriesTest {7    @DataPoint public static int INT_1 = 1;8    @DataPoint public static int INT_2 = 2;9    @DataPoint public static int INT_3 = 3;10    @DataPoint public static int INT_4 = 4;11    @DataPoint public static int INT_5 = 5;12    @DataPoint public static int INT_6 = 6;13    @DataPoint public static int INT_7 = 7;14    @DataPoint public static int INT_8 = 8;15    @DataPoint public static int INT_9 = 9;16    @DataPoint public static int INT_10 = 10;17    @DataPoint public static int INT_11 = 11;18    @DataPoint public static int INT_12 = 12;19    @DataPoint public static int INT_13 = 13;20    @DataPoint public static int INT_14 = 14;21    @DataPoint public static int INT_15 = 15;22    @DataPoint public static int INT_16 = 16;23    @DataPoint public static int INT_17 = 17;24    @DataPoint public static int INT_18 = 18;25    @DataPoint public static int INT_19 = 19;26    @DataPoint public static int INT_20 = 20;27    @DataPoint public static int INT_21 = 21;28    @DataPoint public static int INT_22 = 22;29    @DataPoint public static int INT_23 = 23;30    @DataPoint public static int INT_24 = 24;31    @DataPoint public static int INT_25 = 25;32    @DataPoint public static int INT_26 = 26;33    @DataPoint public static int INT_27 = 27;34    @DataPoint public static int INT_28 = 28;35    @DataPoint public static int INT_29 = 29;36    @DataPoint public static int INT_30 = 30;37    @DataPoint public static int INT_31 = 31;38    @DataPoint public static int INT_32 = 32;

Annotation Type Theory

Using AI Code Generation

1@RunWith(Theories.class)2public class TheoryTest {3	public static int INT_PARAM_1 = 1;4	public static int INT_PARAM_2 = 2;5	public static int INT_PARAM_3 = 3;6	public static int[] INT_PARAMS = {1, 2, 3};7	public static String STRING_PARAM_1 = "1";8	public static String STRING_PARAM_2 = "2";9	public static String STRING_PARAM_3 = "3";10	public static String[] STRING_PARAMS = {"1", "2", "3"};11	public void testTheory(int intParam, String stringParam) {12		System.out.println("intParam: " + intParam + ", stringParam: " + stringParam);13	}14}

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Assertions in JUnit - Assertions are used to validate or test that the result of an action/functionality is the same as expected. Learn in detail what assertions are and how to use them while performing JUnit testing.
Parameterization in JUnit - Parameterized Test enables you to run the same automated test scripts with different variables. By collecting data on each method's test parameters, you can minimize time spent on writing tests. Learn how to use parameterization in JUnit.
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Advanced Use Cases for JUnit testing - Take a deep dive into the advanced use cases, such as how to run JUnit tests in Jupiter, how to use JUnit 5 Mockito for Unit testing, and more for JUnit testing.