test/tck/SplittableRandomTest.java

/*
 * Written by Doug Lea with assistance from members of JCP JSR-166
 * Expert Group and released to the public domain, as explained at
 * http://creativecommons.org/publicdomain/zero/1.0/
 */
import junit.framework.*;
import java.util.*;
import java.util.SplittableRandom;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicLong;
import java.util.concurrent.atomic.LongAdder;

public class SplittableRandomTest extends JSR166TestCase {

    public static void main(String[] args) {
        junit.textui.TestRunner.run(suite());
    }
    public static Test suite() {
        return new TestSuite(SplittableRandomTest.class);
    }

    /*
     * Testing coverage notes:
     *
     * 1. Many of the test methods are adapted from ThreadLocalRandomTest.
     *
     * 2. These tests do not check for random number generator quality.
     * But we check for minimal API compliance by requiring that
     * repeated calls to nextX methods, up to NCALLS tries, produce at
     * least two distinct results. (In some possible universe, a
     * "correct" implementation might fail, but the odds are vastly
     * less than that of encountering a hardware failure while running
     * the test.) For bounded nextX methods, we sample various
     * intervals across multiples of primes. In other tests, we repeat
     * under REPS different values.
     */

    // max numbers of calls to detect getting stuck on one value
    static final int NCALLS = 10000;

    // max sampled int bound
    static final int MAX_INT_BOUND = (1 << 28);

    // max sampled long bound
    static final long MAX_LONG_BOUND = (1L << 42);

    // Number of replications for other checks
    static final int REPS =
        Integer.getInteger("SplittableRandomTest.reps", 4);

    /**
     * Repeated calls to nextInt produce at least two distinct results
     */
    public void testNextInt() {
        SplittableRandom sr = new SplittableRandom();
        int f = sr.nextInt();
        int i = 0;
        while (i < NCALLS && sr.nextInt() == f)
            ++i;
        assertTrue(i < NCALLS);
    }

    /**
     * Repeated calls to nextLong produce at least two distinct results
     */
    public void testNextLong() {
        SplittableRandom sr = new SplittableRandom();
        long f = sr.nextLong();
        int i = 0;
        while (i < NCALLS && sr.nextLong() == f)
            ++i;
        assertTrue(i < NCALLS);
    }

    /**
     * Repeated calls to nextDouble produce at least two distinct results
     */
    public void testNextDouble() {
        SplittableRandom sr = new SplittableRandom();
        double f = sr.nextDouble();
        int i = 0;
        while (i < NCALLS && sr.nextDouble() == f)
            ++i;
        assertTrue(i < NCALLS);
    }

    /**
     * Two SplittableRandoms created with the same seed produce the
     * same values for nextLong.
     */
    public void testSeedConstructor() {
        for (long seed = 2; seed < MAX_LONG_BOUND; seed += 15485863)  {
            SplittableRandom sr1 = new SplittableRandom(seed);
            SplittableRandom sr2 = new SplittableRandom(seed);
            for (int i = 0; i < REPS; ++i)
                assertEquals(sr1.nextLong(), sr2.nextLong());
        }
    }

    /**
     * A SplittableRandom produced by split() of a default-constructed
     * SplittableRandom generates a different sequence
     */
    public void testSplit1() {
        SplittableRandom sr = new SplittableRandom();
        for (int reps = 0; reps < REPS; ++reps) {
            SplittableRandom sc = sr.split();
            int i = 0;
            while (i < NCALLS && sr.nextLong() == sc.nextLong())
                ++i;
            assertTrue(i < NCALLS);
        }
    }

    /**
     * A SplittableRandom produced by split() of a seeded-constructed
     * SplittableRandom generates a different sequence
     */
    public void testSplit2() {
        SplittableRandom sr = new SplittableRandom(12345);
        for (int reps = 0; reps < REPS; ++reps) {
            SplittableRandom sc = sr.split();
            int i = 0;
            while (i < NCALLS && sr.nextLong() == sc.nextLong())
                ++i;
            assertTrue(i < NCALLS);
        }
    }

    /**
     * nextInt(negative) throws IllegalArgumentException
     */
    public void testNextIntBoundedNeg() {
        SplittableRandom sr = new SplittableRandom();
        try {
            int f = sr.nextInt(-17);
            shouldThrow();
        } catch (IllegalArgumentException success) {}
    }

    /**
     * nextInt(least >= bound) throws IllegalArgumentException
     */
    public void testNextIntBadBounds() {
        SplittableRandom sr = new SplittableRandom();
        try {
            int f = sr.nextInt(17, 2);
            shouldThrow();
        } catch (IllegalArgumentException success) {}
    }

    /**
     * nextInt(bound) returns 0 <= value < bound;
     * repeated calls produce at least two distinct results
     */
    public void testNextIntBounded() {
        SplittableRandom sr = new SplittableRandom();
        // sample bound space across prime number increments
        for (int bound = 2; bound < MAX_INT_BOUND; bound += 524959) {
            int f = sr.nextInt(bound);
            assertTrue(0 <= f && f < bound);
            int i = 0;
            int j;
            while (i < NCALLS &&
                   (j = sr.nextInt(bound)) == f) {
                assertTrue(0 <= j && j < bound);
                ++i;
            }
            assertTrue(i < NCALLS);
        }
    }

    /**
     * nextInt(least, bound) returns least <= value < bound;
     * repeated calls produce at least two distinct results
     */
    public void testNextIntBounded2() {
        SplittableRandom sr = new SplittableRandom();
        for (int least = -15485863; least < MAX_INT_BOUND; least += 524959) {
            for (int bound = least + 2; bound > least && bound < MAX_INT_BOUND; bound += 49979687) {
                int f = sr.nextInt(least, bound);
                assertTrue(least <= f && f < bound);
                int i = 0;
                int j;
                while (i < NCALLS &&
                       (j = sr.nextInt(least, bound)) == f) {
                    assertTrue(least <= j && j < bound);
                    ++i;
                }
                assertTrue(i < NCALLS);
            }
        }
    }

    /**
     * nextLong(negative) throws IllegalArgumentException
     */
    public void testNextLongBoundedNeg() {
        SplittableRandom sr = new SplittableRandom();
        try {
            long f = sr.nextLong(-17);
            shouldThrow();
        } catch (IllegalArgumentException success) {}
    }

    /**
     * nextLong(least >= bound) throws IllegalArgumentException
     */
    public void testNextLongBadBounds() {
        SplittableRandom sr = new SplittableRandom();
        try {
            long f = sr.nextLong(17, 2);
            shouldThrow();
        } catch (IllegalArgumentException success) {}
    }

    /**
     * nextLong(bound) returns 0 <= value < bound;
     * repeated calls produce at least two distinct results
     */
    public void testNextLongBounded() {
        SplittableRandom sr = new SplittableRandom();
        for (long bound = 2; bound < MAX_LONG_BOUND; bound += 15485863) {
            long f = sr.nextLong(bound);
            assertTrue(0 <= f && f < bound);
            int i = 0;
            long j;
            while (i < NCALLS &&
                   (j = sr.nextLong(bound)) == f) {
                assertTrue(0 <= j && j < bound);
                ++i;
            }
            assertTrue(i < NCALLS);
        }
    }

    /**
     * nextLong(least, bound) returns least <= value < bound;
     * repeated calls produce at least two distinct results
     */
    public void testNextLongBounded2() {
        SplittableRandom sr = new SplittableRandom();
        for (long least = -86028121; least < MAX_LONG_BOUND; least += 982451653L) {
            for (long bound = least + 2; bound > least && bound < MAX_LONG_BOUND; bound += Math.abs(bound * 7919)) {
                long f = sr.nextLong(least, bound);
                assertTrue(least <= f && f < bound);
                int i = 0;
                long j;
                while (i < NCALLS &&
                       (j = sr.nextLong(least, bound)) == f) {
                    assertTrue(least <= j && j < bound);
                    ++i;
                }
                assertTrue(i < NCALLS);
            }
        }
    }

    /**
     * nextDouble(least, bound) returns least <= value < bound;
     * repeated calls produce at least two distinct results
     */
    public void testNextDoubleBounded2() {
        SplittableRandom sr = new SplittableRandom();
        for (double least = 0.0001; least < 1.0e20; least *= 8) {
            for (double bound = least * 1.001; bound < 1.0e20; bound *= 16) {
                double f = sr.nextDouble(least, bound);
                assertTrue(least <= f && f < bound);
                int i = 0;
                double j;
                while (i < NCALLS &&
                       (j = sr.nextDouble(least, bound)) == f) {
                    assertTrue(least <= j && j < bound);
                    ++i;
                }
                assertTrue(i < NCALLS);
            }
        }
    }

    /**
     * Invoking sized ints, long, doubles, with negative sizes throws
     * IllegalArgumentException
     */
    public void testBadStreamSize() {
        SplittableRandom r = new SplittableRandom();
        try {
            java.util.stream.IntStream x = r.ints(-1L);
            shouldThrow();
        } catch (IllegalArgumentException success) {}
        try {
            java.util.stream.IntStream x = r.ints(-1L, 2, 3);
            shouldThrow();
        } catch (IllegalArgumentException success) {}
        try {
            java.util.stream.LongStream x = r.longs(-1L);
            shouldThrow();
        } catch (IllegalArgumentException success) {}
        try {
            java.util.stream.LongStream x = r.longs(-1L, -1L, 1L);
            shouldThrow();
        } catch (IllegalArgumentException success) {}
        try {
            java.util.stream.DoubleStream x = r.doubles(-1L);
            shouldThrow();
        } catch (IllegalArgumentException success) {}
        try {
            java.util.stream.DoubleStream x = r.doubles(-1L, .5, .6);
            shouldThrow();
        } catch (IllegalArgumentException success) {}
    }

    /**
     * Invoking bounded ints, long, doubles, with illegal bounds throws
     * IllegalArgumentException
     */
    public void testBadStreamBounds() {
        SplittableRandom r = new SplittableRandom();
        try {
            java.util.stream.IntStream x = r.ints(2, 1);
            shouldThrow();
        } catch (IllegalArgumentException success) {}
        try {
            java.util.stream.IntStream x = r.ints(10, 42, 42);
            shouldThrow();
        } catch (IllegalArgumentException success) {}
        try {
            java.util.stream.LongStream x = r.longs(-1L, -1L);
            shouldThrow();
        } catch (IllegalArgumentException success) {}
        try {
            java.util.stream.LongStream x = r.longs(10, 1L, -2L);
            shouldThrow();
        } catch (IllegalArgumentException success) {}
        try {
            java.util.stream.DoubleStream x = r.doubles(0.0, 0.0);
            shouldThrow();
        } catch (IllegalArgumentException success) {}
        try {
            java.util.stream.DoubleStream x = r.doubles(10, .5, .4);
            shouldThrow();
        } catch (IllegalArgumentException success) {}
    }

    /**
     * A parallel sized stream of ints generates the given number of values
     */
    public void testIntsCount() {
        LongAdder counter = new LongAdder();
        SplittableRandom r = new SplittableRandom();
        long size = 0;
        for (int reps = 0; reps < REPS; ++reps) {
            counter.reset();
            r.ints(size).parallel().forEach(x -> counter.increment());
            assertEquals(size, counter.sum());
            size += 524959;
        }
    }

    /**
     * A parallel sized stream of longs generates the given number of values
     */
    public void testLongsCount() {
        LongAdder counter = new LongAdder();
        SplittableRandom r = new SplittableRandom();
        long size = 0;
        for (int reps = 0; reps < REPS; ++reps) {
            counter.reset();
            r.longs(size).parallel().forEach(x -> counter.increment());
            assertEquals(size, counter.sum());
            size += 524959;
        }
    }

    /**
     * A parallel sized stream of doubles generates the given number of values
     */
    public void testDoublesCount() {
        LongAdder counter = new LongAdder();
        SplittableRandom r = new SplittableRandom();
        long size = 0;
        for (int reps = 0; reps < REPS; ++reps) {
            counter.reset();
            r.doubles(size).parallel().forEach(x -> counter.increment());
            assertEquals(size, counter.sum());
            size += 524959;
        }
    }

    /**
     * Each of a parallel sized stream of bounded ints is within bounds
     */
    public void testBoundedInts() {
        AtomicInteger fails = new AtomicInteger(0);
        SplittableRandom r = new SplittableRandom();
        long size = 12345L;
        for (int least = -15485867; least < MAX_INT_BOUND; least += 524959) {
            for (int bound = least + 2; bound > least && bound < MAX_INT_BOUND; bound += 67867967) {
                final int lo = least, hi = bound;
                r.ints(size, lo, hi).parallel().
                    forEach(x -> {if (x < lo || x >= hi)
                                fails.getAndIncrement(); });
            }
        }
        assertEquals(0, fails.get());
    }

    /**
     * Each of a parallel sized stream of bounded longs is within bounds
     */
    public void testBoundedLongs() {
        AtomicInteger fails = new AtomicInteger(0);
        SplittableRandom r = new SplittableRandom();
        long size = 123L;
        for (long least = -86028121; least < MAX_LONG_BOUND; least += 1982451653L) {
            for (long bound = least + 2; bound > least && bound < MAX_LONG_BOUND; bound += Math.abs(bound * 7919)) {
                final long lo = least, hi = bound;
                r.longs(size, lo, hi).parallel().
                    forEach(x -> {if (x < lo || x >= hi)
                                fails.getAndIncrement(); });
            }
        }
        assertEquals(0, fails.get());
    }

    /**
     * Each of a parallel sized stream of bounded doubles is within bounds
     */
    public void testBoundedDoubles() {
        AtomicInteger fails = new AtomicInteger(0);
        SplittableRandom r = new SplittableRandom();
        long size = 456;
        for (double least = 0.00011; least < 1.0e20; least *= 9) {
            for (double bound = least * 1.0011; bound < 1.0e20; bound *= 17) {
                final double lo = least, hi = bound;
                r.doubles(size, lo, hi).parallel().
                    forEach(x -> {if (x < lo || x >= hi)
                                fails.getAndIncrement(); });
            }
        }
        assertEquals(0, fails.get());
    }

    /**
     * A parallel unsized stream of ints generates at least 100 values
     */
    public void testUnsizedIntsCount() {
        LongAdder counter = new LongAdder();
        SplittableRandom r = new SplittableRandom();
        long size = 100;
        r.ints().limit(size).parallel().forEach(x -> counter.increment());
        assertEquals(size, counter.sum());
    }

    /**
     * A parallel unsized stream of longs generates at least 100 values
     */
    public void testUnsizedLongsCount() {
        LongAdder counter = new LongAdder();
        SplittableRandom r = new SplittableRandom();
        long size = 100;
        r.longs().limit(size).parallel().forEach(x -> counter.increment());
        assertEquals(size, counter.sum());
    }

    /**
     * A parallel unsized stream of doubles generates at least 100 values
     */
    public void testUnsizedDoublesCount() {
        LongAdder counter = new LongAdder();
        SplittableRandom r = new SplittableRandom();
        long size = 100;
        r.doubles().limit(size).parallel().forEach(x -> counter.increment());
        assertEquals(size, counter.sum());
    }

    /**
     * A sequential unsized stream of ints generates at least 100 values
     */
    public void testUnsizedIntsCountSeq() {
        LongAdder counter = new LongAdder();
        SplittableRandom r = new SplittableRandom();
        long size = 100;
        r.ints().limit(size).forEach(x -> counter.increment());
        assertEquals(size, counter.sum());
    }

    /**
     * A sequential unsized stream of longs generates at least 100 values
     */
    public void testUnsizedLongsCountSeq() {
        LongAdder counter = new LongAdder();
        SplittableRandom r = new SplittableRandom();
        long size = 100;
        r.longs().limit(size).forEach(x -> counter.increment());
        assertEquals(size, counter.sum());
    }

    /**
     * A sequential unsized stream of doubles generates at least 100 values
     */
    public void testUnsizedDoublesCountSeq() {
        LongAdder counter = new LongAdder();
        SplittableRandom r = new SplittableRandom();
        long size = 100;
        r.doubles().limit(size).forEach(x -> counter.increment());
        assertEquals(size, counter.sum());
    }

}
Revision:	1.7
Committed:	Mon Sep 23 17:23:50 2013 UTC (10 years, 7 months ago) by jsr166
Branch:	MAIN
Changes since 1.6:	+2 -1 lines
Log Message:	Reduce default value of REPS
#	Content
1	/*
2	* Written by Doug Lea with assistance from members of JCP JSR-166
3	* Expert Group and released to the public domain, as explained at
4	* http://creativecommons.org/publicdomain/zero/1.0/
5	*/
6	import junit.framework.*;
7	import java.util.*;
8	import java.util.SplittableRandom;
9	import java.util.concurrent.atomic.AtomicInteger;
10	import java.util.concurrent.atomic.AtomicLong;
11	import java.util.concurrent.atomic.LongAdder;
12
13	public class SplittableRandomTest extends JSR166TestCase {
14
15	public static void main(String[] args) {
16	junit.textui.TestRunner.run(suite());
17	}
18	public static Test suite() {
19	return new TestSuite(SplittableRandomTest.class);
20	}
21
22	/*
23	* Testing coverage notes:
24	*
25	* 1. Many of the test methods are adapted from ThreadLocalRandomTest.
26	*
27	* 2. These tests do not check for random number generator quality.
28	* But we check for minimal API compliance by requiring that
29	* repeated calls to nextX methods, up to NCALLS tries, produce at
30	* least two distinct results. (In some possible universe, a
31	* "correct" implementation might fail, but the odds are vastly
32	* less than that of encountering a hardware failure while running
33	* the test.) For bounded nextX methods, we sample various
34	* intervals across multiples of primes. In other tests, we repeat
35	* under REPS different values.
36	*/
37
38	// max numbers of calls to detect getting stuck on one value
39	static final int NCALLS = 10000;
40
41	// max sampled int bound
42	static final int MAX_INT_BOUND = (1 << 28);
43
44	// max sampled long bound
45	static final long MAX_LONG_BOUND = (1L << 42);
46
47	// Number of replications for other checks
48	static final int REPS =
49	Integer.getInteger("SplittableRandomTest.reps", 4);
50
51	/**
52	* Repeated calls to nextInt produce at least two distinct results
53	*/
54	public void testNextInt() {
55	SplittableRandom sr = new SplittableRandom();
56	int f = sr.nextInt();
57	int i = 0;
58	while (i < NCALLS && sr.nextInt() == f)
59	++i;
60	assertTrue(i < NCALLS);
61	}
62
63	/**
64	* Repeated calls to nextLong produce at least two distinct results
65	*/
66	public void testNextLong() {
67	SplittableRandom sr = new SplittableRandom();
68	long f = sr.nextLong();
69	int i = 0;
70	while (i < NCALLS && sr.nextLong() == f)
71	++i;
72	assertTrue(i < NCALLS);
73	}
74
75	/**
76	* Repeated calls to nextDouble produce at least two distinct results
77	*/
78	public void testNextDouble() {
79	SplittableRandom sr = new SplittableRandom();
80	double f = sr.nextDouble();
81	int i = 0;
82	while (i < NCALLS && sr.nextDouble() == f)
83	++i;
84	assertTrue(i < NCALLS);
85	}
86
87	/**
88	* Two SplittableRandoms created with the same seed produce the
89	* same values for nextLong.
90	*/
91	public void testSeedConstructor() {
92	for (long seed = 2; seed < MAX_LONG_BOUND; seed += 15485863) {
93	SplittableRandom sr1 = new SplittableRandom(seed);
94	SplittableRandom sr2 = new SplittableRandom(seed);
95	for (int i = 0; i < REPS; ++i)
96	assertEquals(sr1.nextLong(), sr2.nextLong());
97	}
98	}
99
100	/**
101	* A SplittableRandom produced by split() of a default-constructed
102	* SplittableRandom generates a different sequence
103	*/
104	public void testSplit1() {
105	SplittableRandom sr = new SplittableRandom();
106	for (int reps = 0; reps < REPS; ++reps) {
107	SplittableRandom sc = sr.split();
108	int i = 0;
109	while (i < NCALLS && sr.nextLong() == sc.nextLong())
110	++i;
111	assertTrue(i < NCALLS);
112	}
113	}
114
115	/**
116	* A SplittableRandom produced by split() of a seeded-constructed
117	* SplittableRandom generates a different sequence
118	*/
119	public void testSplit2() {
120	SplittableRandom sr = new SplittableRandom(12345);
121	for (int reps = 0; reps < REPS; ++reps) {
122	SplittableRandom sc = sr.split();
123	int i = 0;
124	while (i < NCALLS && sr.nextLong() == sc.nextLong())
125	++i;
126	assertTrue(i < NCALLS);
127	}
128	}
129
130	/**
131	* nextInt(negative) throws IllegalArgumentException
132	*/
133	public void testNextIntBoundedNeg() {
134	SplittableRandom sr = new SplittableRandom();
135	try {
136	int f = sr.nextInt(-17);
137	shouldThrow();
138	} catch (IllegalArgumentException success) {}
139	}
140
141	/**
142	* nextInt(least >= bound) throws IllegalArgumentException
143	*/
144	public void testNextIntBadBounds() {
145	SplittableRandom sr = new SplittableRandom();
146	try {
147	int f = sr.nextInt(17, 2);
148	shouldThrow();
149	} catch (IllegalArgumentException success) {}
150	}
151
152	/**
153	* nextInt(bound) returns 0 <= value < bound;
154	* repeated calls produce at least two distinct results
155	*/
156	public void testNextIntBounded() {
157	SplittableRandom sr = new SplittableRandom();
158	// sample bound space across prime number increments
159	for (int bound = 2; bound < MAX_INT_BOUND; bound += 524959) {
160	int f = sr.nextInt(bound);
161	assertTrue(0 <= f && f < bound);
162	int i = 0;
163	int j;
164	while (i < NCALLS &&
165	(j = sr.nextInt(bound)) == f) {
166	assertTrue(0 <= j && j < bound);
167	++i;
168	}
169	assertTrue(i < NCALLS);
170	}
171	}
172
173	/**
174	* nextInt(least, bound) returns least <= value < bound;
175	* repeated calls produce at least two distinct results
176	*/
177	public void testNextIntBounded2() {
178	SplittableRandom sr = new SplittableRandom();
179	for (int least = -15485863; least < MAX_INT_BOUND; least += 524959) {
180	for (int bound = least + 2; bound > least && bound < MAX_INT_BOUND; bound += 49979687) {
181	int f = sr.nextInt(least, bound);
182	assertTrue(least <= f && f < bound);
183	int i = 0;
184	int j;
185	while (i < NCALLS &&
186	(j = sr.nextInt(least, bound)) == f) {
187	assertTrue(least <= j && j < bound);
188	++i;
189	}
190	assertTrue(i < NCALLS);
191	}
192	}
193	}
194
195	/**
196	* nextLong(negative) throws IllegalArgumentException
197	*/
198	public void testNextLongBoundedNeg() {
199	SplittableRandom sr = new SplittableRandom();
200	try {
201	long f = sr.nextLong(-17);
202	shouldThrow();
203	} catch (IllegalArgumentException success) {}
204	}
205
206	/**
207	* nextLong(least >= bound) throws IllegalArgumentException
208	*/
209	public void testNextLongBadBounds() {
210	SplittableRandom sr = new SplittableRandom();
211	try {
212	long f = sr.nextLong(17, 2);
213	shouldThrow();
214	} catch (IllegalArgumentException success) {}
215	}
216
217	/**
218	* nextLong(bound) returns 0 <= value < bound;
219	* repeated calls produce at least two distinct results
220	*/
221	public void testNextLongBounded() {
222	SplittableRandom sr = new SplittableRandom();
223	for (long bound = 2; bound < MAX_LONG_BOUND; bound += 15485863) {
224	long f = sr.nextLong(bound);
225	assertTrue(0 <= f && f < bound);
226	int i = 0;
227	long j;
228	while (i < NCALLS &&
229	(j = sr.nextLong(bound)) == f) {
230	assertTrue(0 <= j && j < bound);
231	++i;
232	}
233	assertTrue(i < NCALLS);
234	}
235	}
236
237	/**
238	* nextLong(least, bound) returns least <= value < bound;
239	* repeated calls produce at least two distinct results
240	*/
241	public void testNextLongBounded2() {
242	SplittableRandom sr = new SplittableRandom();
243	for (long least = -86028121; least < MAX_LONG_BOUND; least += 982451653L) {
244	for (long bound = least + 2; bound > least && bound < MAX_LONG_BOUND; bound += Math.abs(bound * 7919)) {
245	long f = sr.nextLong(least, bound);
246	assertTrue(least <= f && f < bound);
247	int i = 0;
248	long j;
249	while (i < NCALLS &&
250	(j = sr.nextLong(least, bound)) == f) {
251	assertTrue(least <= j && j < bound);
252	++i;
253	}
254	assertTrue(i < NCALLS);
255	}
256	}
257	}
258
259	/**
260	* nextDouble(least, bound) returns least <= value < bound;
261	* repeated calls produce at least two distinct results
262	*/
263	public void testNextDoubleBounded2() {
264	SplittableRandom sr = new SplittableRandom();
265	for (double least = 0.0001; least < 1.0e20; least *= 8) {
266	for (double bound = least * 1.001; bound < 1.0e20; bound *= 16) {
267	double f = sr.nextDouble(least, bound);
268	assertTrue(least <= f && f < bound);
269	int i = 0;
270	double j;
271	while (i < NCALLS &&
272	(j = sr.nextDouble(least, bound)) == f) {
273	assertTrue(least <= j && j < bound);
274	++i;
275	}
276	assertTrue(i < NCALLS);
277	}
278	}
279	}
280
281	/**
282	* Invoking sized ints, long, doubles, with negative sizes throws
283	* IllegalArgumentException
284	*/
285	public void testBadStreamSize() {
286	SplittableRandom r = new SplittableRandom();
287	try {
288	java.util.stream.IntStream x = r.ints(-1L);
289	shouldThrow();
290	} catch (IllegalArgumentException success) {}
291	try {
292	java.util.stream.IntStream x = r.ints(-1L, 2, 3);
293	shouldThrow();
294	} catch (IllegalArgumentException success) {}
295	try {
296	java.util.stream.LongStream x = r.longs(-1L);
297	shouldThrow();
298	} catch (IllegalArgumentException success) {}
299	try {
300	java.util.stream.LongStream x = r.longs(-1L, -1L, 1L);
301	shouldThrow();
302	} catch (IllegalArgumentException success) {}
303	try {
304	java.util.stream.DoubleStream x = r.doubles(-1L);
305	shouldThrow();
306	} catch (IllegalArgumentException success) {}
307	try {
308	java.util.stream.DoubleStream x = r.doubles(-1L, .5, .6);
309	shouldThrow();
310	} catch (IllegalArgumentException success) {}
311	}
312
313	/**
314	* Invoking bounded ints, long, doubles, with illegal bounds throws
315	* IllegalArgumentException
316	*/
317	public void testBadStreamBounds() {
318	SplittableRandom r = new SplittableRandom();
319	try {
320	java.util.stream.IntStream x = r.ints(2, 1);
321	shouldThrow();
322	} catch (IllegalArgumentException success) {}
323	try {
324	java.util.stream.IntStream x = r.ints(10, 42, 42);
325	shouldThrow();
326	} catch (IllegalArgumentException success) {}
327	try {
328	java.util.stream.LongStream x = r.longs(-1L, -1L);
329	shouldThrow();
330	} catch (IllegalArgumentException success) {}
331	try {
332	java.util.stream.LongStream x = r.longs(10, 1L, -2L);
333	shouldThrow();
334	} catch (IllegalArgumentException success) {}
335	try {
336	java.util.stream.DoubleStream x = r.doubles(0.0, 0.0);
337	shouldThrow();
338	} catch (IllegalArgumentException success) {}
339	try {
340	java.util.stream.DoubleStream x = r.doubles(10, .5, .4);
341	shouldThrow();
342	} catch (IllegalArgumentException success) {}
343	}
344
345	/**
346	* A parallel sized stream of ints generates the given number of values
347	*/
348	public void testIntsCount() {
349	LongAdder counter = new LongAdder();
350	SplittableRandom r = new SplittableRandom();
351	long size = 0;
352	for (int reps = 0; reps < REPS; ++reps) {
353	counter.reset();
354	r.ints(size).parallel().forEach(x -> counter.increment());
355	assertEquals(size, counter.sum());
356	size += 524959;
357	}
358	}
359
360	/**
361	* A parallel sized stream of longs generates the given number of values
362	*/
363	public void testLongsCount() {
364	LongAdder counter = new LongAdder();
365	SplittableRandom r = new SplittableRandom();
366	long size = 0;
367	for (int reps = 0; reps < REPS; ++reps) {
368	counter.reset();
369	r.longs(size).parallel().forEach(x -> counter.increment());
370	assertEquals(size, counter.sum());
371	size += 524959;
372	}
373	}
374
375	/**
376	* A parallel sized stream of doubles generates the given number of values
377	*/
378	public void testDoublesCount() {
379	LongAdder counter = new LongAdder();
380	SplittableRandom r = new SplittableRandom();
381	long size = 0;
382	for (int reps = 0; reps < REPS; ++reps) {
383	counter.reset();
384	r.doubles(size).parallel().forEach(x -> counter.increment());
385	assertEquals(size, counter.sum());
386	size += 524959;
387	}
388	}
389
390	/**
391	* Each of a parallel sized stream of bounded ints is within bounds
392	*/
393	public void testBoundedInts() {
394	AtomicInteger fails = new AtomicInteger(0);
395	SplittableRandom r = new SplittableRandom();
396	long size = 12345L;
397	for (int least = -15485867; least < MAX_INT_BOUND; least += 524959) {
398	for (int bound = least + 2; bound > least && bound < MAX_INT_BOUND; bound += 67867967) {
399	final int lo = least, hi = bound;
400	r.ints(size, lo, hi).parallel().
401	forEach(x -> {if (x < lo \|\| x >= hi)
402	fails.getAndIncrement(); });
403	}
404	}
405	assertEquals(0, fails.get());
406	}
407
408	/**
409	* Each of a parallel sized stream of bounded longs is within bounds
410	*/
411	public void testBoundedLongs() {
412	AtomicInteger fails = new AtomicInteger(0);
413	SplittableRandom r = new SplittableRandom();
414	long size = 123L;
415	for (long least = -86028121; least < MAX_LONG_BOUND; least += 1982451653L) {
416	for (long bound = least + 2; bound > least && bound < MAX_LONG_BOUND; bound += Math.abs(bound * 7919)) {
417	final long lo = least, hi = bound;
418	r.longs(size, lo, hi).parallel().
419	forEach(x -> {if (x < lo \|\| x >= hi)
420	fails.getAndIncrement(); });
421	}
422	}
423	assertEquals(0, fails.get());
424	}
425
426	/**
427	* Each of a parallel sized stream of bounded doubles is within bounds
428	*/
429	public void testBoundedDoubles() {
430	AtomicInteger fails = new AtomicInteger(0);
431	SplittableRandom r = new SplittableRandom();
432	long size = 456;
433	for (double least = 0.00011; least < 1.0e20; least *= 9) {
434	for (double bound = least * 1.0011; bound < 1.0e20; bound *= 17) {
435	final double lo = least, hi = bound;
436	r.doubles(size, lo, hi).parallel().
437	forEach(x -> {if (x < lo \|\| x >= hi)
438	fails.getAndIncrement(); });
439	}
440	}
441	assertEquals(0, fails.get());
442	}
443
444	/**
445	* A parallel unsized stream of ints generates at least 100 values
446	*/
447	public void testUnsizedIntsCount() {
448	LongAdder counter = new LongAdder();
449	SplittableRandom r = new SplittableRandom();
450	long size = 100;
451	r.ints().limit(size).parallel().forEach(x -> counter.increment());
452	assertEquals(size, counter.sum());
453	}
454
455	/**
456	* A parallel unsized stream of longs generates at least 100 values
457	*/
458	public void testUnsizedLongsCount() {
459	LongAdder counter = new LongAdder();
460	SplittableRandom r = new SplittableRandom();
461	long size = 100;
462	r.longs().limit(size).parallel().forEach(x -> counter.increment());
463	assertEquals(size, counter.sum());
464	}
465
466	/**
467	* A parallel unsized stream of doubles generates at least 100 values
468	*/
469	public void testUnsizedDoublesCount() {
470	LongAdder counter = new LongAdder();
471	SplittableRandom r = new SplittableRandom();
472	long size = 100;
473	r.doubles().limit(size).parallel().forEach(x -> counter.increment());
474	assertEquals(size, counter.sum());
475	}
476
477	/**
478	* A sequential unsized stream of ints generates at least 100 values
479	*/
480	public void testUnsizedIntsCountSeq() {
481	LongAdder counter = new LongAdder();
482	SplittableRandom r = new SplittableRandom();
483	long size = 100;
484	r.ints().limit(size).forEach(x -> counter.increment());
485	assertEquals(size, counter.sum());
486	}
487
488	/**
489	* A sequential unsized stream of longs generates at least 100 values
490	*/
491	public void testUnsizedLongsCountSeq() {
492	LongAdder counter = new LongAdder();
493	SplittableRandom r = new SplittableRandom();
494	long size = 100;
495	r.longs().limit(size).forEach(x -> counter.increment());
496	assertEquals(size, counter.sum());
497	}
498
499	/**
500	* A sequential unsized stream of doubles generates at least 100 values
501	*/
502	public void testUnsizedDoublesCountSeq() {
503	LongAdder counter = new LongAdder();
504	SplittableRandom r = new SplittableRandom();
505	long size = 100;
506	r.doubles().limit(size).forEach(x -> counter.increment());
507	assertEquals(size, counter.sum());
508	}
509
510	}