google3/third_party/java_src/junit/test/java/org/junit/tests/experimental/theories/runner/SuccessfulWithDataPointFields.java

package org.junit.tests.experimental.theories.runner;

import static org.hamcrest.CoreMatchers.is;
import static org.hamcrest.MatcherAssert.assertThat;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
import static org.junit.Assume.assumeTrue;

import java.util.ArrayList;
import java.util.List;

import org.junit.AfterClass;
import org.junit.Before;
import org.junit.BeforeClass;
import org.junit.Test;
import org.junit.experimental.runners.Enclosed;
import org.junit.experimental.theories.DataPoint;
import org.junit.experimental.theories.Theories;
import org.junit.experimental.theories.Theory;
import org.junit.runner.RunWith;

@RunWith(Enclosed.class)
public class SuccessfulWithDataPointFields {
    @RunWith(Theories.class)
    public static class HasATwoParameterTheory {
        @DataPoint
        public static int ONE = 1;

        @Theory
        public void allIntsAreEqual(int x, int y) {
            assertThat(x, is(y));
        }
    }

    @RunWith(Theories.class)
    public static class BeforeAndAfterOnSameInstance {
        @DataPoint
        public static String A = "A";

        private int befores = 0;

        @Before
        public void incrementBefore() {
            befores++;
        }

        @Theory
        public void stringsAreOK(String string) {
            assertTrue(befores == 1);
        }
    }

    @RunWith(Theories.class)
    public static class NewObjectEachTime {
        @DataPoint
        public static String A = "A";

        @DataPoint
        public static String B = "B";

        private List<String> list = new ArrayList<String>();

        @Theory
        public void addToEmptyList(String string) {
            list.add(string);
            assertThat(list.size(), is(1));
        }
    }

    @RunWith(Theories.class)
    public static class PositiveInts {
        @DataPoint
        public static final int ONE = 1;

        private int x;

        public PositiveInts(int x) {
            assumeTrue(x > 0);
            this.x = x;
        }

        @Theory
        public void haveAPostiveSquare() {
            assertTrue(x * x > 0);
        }
    }

    @RunWith(Theories.class)
    public static class PositiveIntsWithNegativeField {
        @DataPoint
        public static final int ONE = 1;
        @DataPoint
        public static final int NEGONE = -1;

        private int x;

        public PositiveIntsWithNegativeField(int x) {
            assumeTrue(x > 0);
            this.x = x;
        }

        @Theory
        public void haveAPostiveSquare() {
            assertTrue(x > 0);
        }
    }

    @RunWith(Theories.class)
    public static class PositiveIntsWithMethodParams {
        @DataPoint
        public static final int ONE = 1;

        private int x;

        public PositiveIntsWithMethodParams(int x) {
            assumeTrue(x > 0);
            this.x = x;
        }

        @Theory
        public void haveAPostiveSquare(int y) {
            assumeTrue(y > 0);
            assertTrue(x * y > 0);
        }
    }

    @RunWith(Theories.class)
    public static class DifferentTypesInConstructor {
        @DataPoint
        public static final int ONE = 1;

        @DataPoint
        public static final String A = "A";

        public DifferentTypesInConstructor(int x) {
        }

        @Theory
        public void yesIndeed(String a) {
        }
    }

    @RunWith(Theories.class)
    public static class BeforeAndAfterEachTime {
        public static int befores = 0;

        @DataPoint
        public static String A = "A";

        @DataPoint
        public static String B = "B";

        @Before
        public void incrementBefore() {
            befores++;
        }

        @BeforeClass
        public static void resetCalls() {
            befores = 0;
        }

        @Theory
        public void stringsAreOK(String string) {
        }

        @AfterClass
        public static void calledTwice() {
            assertEquals(2, befores);
        }
    }

    @RunWith(Theories.class)
    public static class OneTestTwoAnnotations {
        public static int tests = 0;

        @DataPoint
        public static String A = "A";

        @BeforeClass
        public static void resetCalls() {
            tests = 0;
        }

        @Theory
        @Test
        public void stringsAreOK(String string) {
            tests++;
        }

        @AfterClass
        public static void calledTwice() {
            assertEquals(1, tests);
        }
    }

    @RunWith(Theories.class)
    public static class StaticPublicNonDataPoints {
        // DataPoint which passes the test
        @DataPoint
        public static int ZERO = 0;

        // Not annotated as a DataPoint and therefore should be ignored:
        public static int ONE = 1;

        @Theory
        public void onlyAnnotatedFields(int i) {
            assertTrue(i == 0);
        }
    }
}