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 = 20;

    /**
     * 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:	1.6
Committed:	Mon Sep 23 17:05:52 2013 UTC (10 years, 7 months ago) by jsr166
Branch:	MAIN
Changes since 1.5:	+9 -9 lines
Log Message:	use nicer lambda syntax
#	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 = 20;
49
50	/**
51	* Repeated calls to nextInt produce at least two distinct results
52	*/
53	public void testNextInt() {
54	SplittableRandom sr = new SplittableRandom();
55	int f = sr.nextInt();
56	int i = 0;
57	while (i < NCALLS && sr.nextInt() == f)
58	++i;
59	assertTrue(i < NCALLS);
60	}
61
62	/**
63	* Repeated calls to nextLong produce at least two distinct results
64	*/
65	public void testNextLong() {
66	SplittableRandom sr = new SplittableRandom();
67	long f = sr.nextLong();
68	int i = 0;
69	while (i < NCALLS && sr.nextLong() == f)
70	++i;
71	assertTrue(i < NCALLS);
72	}
73
74	/**
75	* Repeated calls to nextDouble produce at least two distinct results
76	*/
77	public void testNextDouble() {
78	SplittableRandom sr = new SplittableRandom();
79	double f = sr.nextDouble();
80	int i = 0;
81	while (i < NCALLS && sr.nextDouble() == f)
82	++i;
83	assertTrue(i < NCALLS);
84	}
85
86	/**
87	* Two SplittableRandoms created with the same seed produce the
88	* same values for nextLong.
89	*/
90	public void testSeedConstructor() {
91	for (long seed = 2; seed < MAX_LONG_BOUND; seed += 15485863) {
92	SplittableRandom sr1 = new SplittableRandom(seed);
93	SplittableRandom sr2 = new SplittableRandom(seed);
94	for (int i = 0; i < REPS; ++i)
95	assertEquals(sr1.nextLong(), sr2.nextLong());
96	}
97	}
98
99	/**
100	* A SplittableRandom produced by split() of a default-constructed
101	* SplittableRandom generates a different sequence
102	*/
103	public void testSplit1() {
104	SplittableRandom sr = new SplittableRandom();
105	for (int reps = 0; reps < REPS; ++reps) {
106	SplittableRandom sc = sr.split();
107	int i = 0;
108	while (i < NCALLS && sr.nextLong() == sc.nextLong())
109	++i;
110	assertTrue(i < NCALLS);
111	}
112	}
113
114	/**
115	* A SplittableRandom produced by split() of a seeded-constructed
116	* SplittableRandom generates a different sequence
117	*/
118	public void testSplit2() {
119	SplittableRandom sr = new SplittableRandom(12345);
120	for (int reps = 0; reps < REPS; ++reps) {
121	SplittableRandom sc = sr.split();
122	int i = 0;
123	while (i < NCALLS && sr.nextLong() == sc.nextLong())
124	++i;
125	assertTrue(i < NCALLS);
126	}
127	}
128
129	/**
130	* nextInt(negative) throws IllegalArgumentException
131	*/
132	public void testNextIntBoundedNeg() {
133	SplittableRandom sr = new SplittableRandom();
134	try {
135	int f = sr.nextInt(-17);
136	shouldThrow();
137	} catch (IllegalArgumentException success) {}
138	}
139
140	/**
141	* nextInt(least >= bound) throws IllegalArgumentException
142	*/
143	public void testNextIntBadBounds() {
144	SplittableRandom sr = new SplittableRandom();
145	try {
146	int f = sr.nextInt(17, 2);
147	shouldThrow();
148	} catch (IllegalArgumentException success) {}
149	}
150
151	/**
152	* nextInt(bound) returns 0 <= value < bound;
153	* repeated calls produce at least two distinct results
154	*/
155	public void testNextIntBounded() {
156	SplittableRandom sr = new SplittableRandom();
157	// sample bound space across prime number increments
158	for (int bound = 2; bound < MAX_INT_BOUND; bound += 524959) {
159	int f = sr.nextInt(bound);
160	assertTrue(0 <= f && f < bound);
161	int i = 0;
162	int j;
163	while (i < NCALLS &&
164	(j = sr.nextInt(bound)) == f) {
165	assertTrue(0 <= j && j < bound);
166	++i;
167	}
168	assertTrue(i < NCALLS);
169	}
170	}
171
172	/**
173	* nextInt(least, bound) returns least <= value < bound;
174	* repeated calls produce at least two distinct results
175	*/
176	public void testNextIntBounded2() {
177	SplittableRandom sr = new SplittableRandom();
178	for (int least = -15485863; least < MAX_INT_BOUND; least += 524959) {
179	for (int bound = least + 2; bound > least && bound < MAX_INT_BOUND; bound += 49979687) {
180	int f = sr.nextInt(least, bound);
181	assertTrue(least <= f && f < bound);
182	int i = 0;
183	int j;
184	while (i < NCALLS &&
185	(j = sr.nextInt(least, bound)) == f) {
186	assertTrue(least <= j && j < bound);
187	++i;
188	}
189	assertTrue(i < NCALLS);
190	}
191	}
192	}
193
194	/**
195	* nextLong(negative) throws IllegalArgumentException
196	*/
197	public void testNextLongBoundedNeg() {
198	SplittableRandom sr = new SplittableRandom();
199	try {
200	long f = sr.nextLong(-17);
201	shouldThrow();
202	} catch (IllegalArgumentException success) {}
203	}
204
205	/**
206	* nextLong(least >= bound) throws IllegalArgumentException
207	*/
208	public void testNextLongBadBounds() {
209	SplittableRandom sr = new SplittableRandom();
210	try {
211	long f = sr.nextLong(17, 2);
212	shouldThrow();
213	} catch (IllegalArgumentException success) {}
214	}
215
216	/**
217	* nextLong(bound) returns 0 <= value < bound;
218	* repeated calls produce at least two distinct results
219	*/
220	public void testNextLongBounded() {
221	SplittableRandom sr = new SplittableRandom();
222	for (long bound = 2; bound < MAX_LONG_BOUND; bound += 15485863) {
223	long f = sr.nextLong(bound);
224	assertTrue(0 <= f && f < bound);
225	int i = 0;
226	long j;
227	while (i < NCALLS &&
228	(j = sr.nextLong(bound)) == f) {
229	assertTrue(0 <= j && j < bound);
230	++i;
231	}
232	assertTrue(i < NCALLS);
233	}
234	}
235
236	/**
237	* nextLong(least, bound) returns least <= value < bound;
238	* repeated calls produce at least two distinct results
239	*/
240	public void testNextLongBounded2() {
241	SplittableRandom sr = new SplittableRandom();
242	for (long least = -86028121; least < MAX_LONG_BOUND; least += 982451653L) {
243	for (long bound = least + 2; bound > least && bound < MAX_LONG_BOUND; bound += Math.abs(bound * 7919)) {
244	long f = sr.nextLong(least, bound);
245	assertTrue(least <= f && f < bound);
246	int i = 0;
247	long j;
248	while (i < NCALLS &&
249	(j = sr.nextLong(least, bound)) == f) {
250	assertTrue(least <= j && j < bound);
251	++i;
252	}
253	assertTrue(i < NCALLS);
254	}
255	}
256	}
257
258	/**
259	* nextDouble(least, bound) returns least <= value < bound;
260	* repeated calls produce at least two distinct results
261	*/
262	public void testNextDoubleBounded2() {
263	SplittableRandom sr = new SplittableRandom();
264	for (double least = 0.0001; least < 1.0e20; least *= 8) {
265	for (double bound = least * 1.001; bound < 1.0e20; bound *= 16) {
266	double f = sr.nextDouble(least, bound);
267	assertTrue(least <= f && f < bound);
268	int i = 0;
269	double j;
270	while (i < NCALLS &&
271	(j = sr.nextDouble(least, bound)) == f) {
272	assertTrue(least <= j && j < bound);
273	++i;
274	}
275	assertTrue(i < NCALLS);
276	}
277	}
278	}
279
280	/**
281	* Invoking sized ints, long, doubles, with negative sizes throws
282	* IllegalArgumentException
283	*/
284	public void testBadStreamSize() {
285	SplittableRandom r = new SplittableRandom();
286	try {
287	java.util.stream.IntStream x = r.ints(-1L);
288	shouldThrow();
289	} catch (IllegalArgumentException success) {}
290	try {
291	java.util.stream.IntStream x = r.ints(-1L, 2, 3);
292	shouldThrow();
293	} catch (IllegalArgumentException success) {}
294	try {
295	java.util.stream.LongStream x = r.longs(-1L);
296	shouldThrow();
297	} catch (IllegalArgumentException success) {}
298	try {
299	java.util.stream.LongStream x = r.longs(-1L, -1L, 1L);
300	shouldThrow();
301	} catch (IllegalArgumentException success) {}
302	try {
303	java.util.stream.DoubleStream x = r.doubles(-1L);
304	shouldThrow();
305	} catch (IllegalArgumentException success) {}
306	try {
307	java.util.stream.DoubleStream x = r.doubles(-1L, .5, .6);
308	shouldThrow();
309	} catch (IllegalArgumentException success) {}
310	}
311
312	/**
313	* Invoking bounded ints, long, doubles, with illegal bounds throws
314	* IllegalArgumentException
315	*/
316	public void testBadStreamBounds() {
317	SplittableRandom r = new SplittableRandom();
318	try {
319	java.util.stream.IntStream x = r.ints(2, 1);
320	shouldThrow();
321	} catch (IllegalArgumentException success) {}
322	try {
323	java.util.stream.IntStream x = r.ints(10, 42, 42);
324	shouldThrow();
325	} catch (IllegalArgumentException success) {}
326	try {
327	java.util.stream.LongStream x = r.longs(-1L, -1L);
328	shouldThrow();
329	} catch (IllegalArgumentException success) {}
330	try {
331	java.util.stream.LongStream x = r.longs(10, 1L, -2L);
332	shouldThrow();
333	} catch (IllegalArgumentException success) {}
334	try {
335	java.util.stream.DoubleStream x = r.doubles(0.0, 0.0);
336	shouldThrow();
337	} catch (IllegalArgumentException success) {}
338	try {
339	java.util.stream.DoubleStream x = r.doubles(10, .5, .4);
340	shouldThrow();
341	} catch (IllegalArgumentException success) {}
342	}
343
344	/**
345	* A parallel sized stream of ints generates the given number of values
346	*/
347	public void testIntsCount() {
348	LongAdder counter = new LongAdder();
349	SplittableRandom r = new SplittableRandom();
350	long size = 0;
351	for (int reps = 0; reps < REPS; ++reps) {
352	counter.reset();
353	r.ints(size).parallel().forEach(x -> counter.increment());
354	assertEquals(size, counter.sum());
355	size += 524959;
356	}
357	}
358
359	/**
360	* A parallel sized stream of longs generates the given number of values
361	*/
362	public void testLongsCount() {
363	LongAdder counter = new LongAdder();
364	SplittableRandom r = new SplittableRandom();
365	long size = 0;
366	for (int reps = 0; reps < REPS; ++reps) {
367	counter.reset();
368	r.longs(size).parallel().forEach(x -> counter.increment());
369	assertEquals(size, counter.sum());
370	size += 524959;
371	}
372	}
373
374	/**
375	* A parallel sized stream of doubles generates the given number of values
376	*/
377	public void testDoublesCount() {
378	LongAdder counter = new LongAdder();
379	SplittableRandom r = new SplittableRandom();
380	long size = 0;
381	for (int reps = 0; reps < REPS; ++reps) {
382	counter.reset();
383	r.doubles(size).parallel().forEach(x -> counter.increment());
384	assertEquals(size, counter.sum());
385	size += 524959;
386	}
387	}
388
389	/**
390	* Each of a parallel sized stream of bounded ints is within bounds
391	*/
392	public void testBoundedInts() {
393	AtomicInteger fails = new AtomicInteger(0);
394	SplittableRandom r = new SplittableRandom();
395	long size = 12345L;
396	for (int least = -15485867; least < MAX_INT_BOUND; least += 524959) {
397	for (int bound = least + 2; bound > least && bound < MAX_INT_BOUND; bound += 67867967) {
398	final int lo = least, hi = bound;
399	r.ints(size, lo, hi).parallel().
400	forEach(x -> {if (x < lo \|\| x >= hi)
401	fails.getAndIncrement(); });
402	}
403	}
404	assertEquals(0, fails.get());
405	}
406
407	/**
408	* Each of a parallel sized stream of bounded longs is within bounds
409	*/
410	public void testBoundedLongs() {
411	AtomicInteger fails = new AtomicInteger(0);
412	SplittableRandom r = new SplittableRandom();
413	long size = 123L;
414	for (long least = -86028121; least < MAX_LONG_BOUND; least += 1982451653L) {
415	for (long bound = least + 2; bound > least && bound < MAX_LONG_BOUND; bound += Math.abs(bound * 7919)) {
416	final long lo = least, hi = bound;
417	r.longs(size, lo, hi).parallel().
418	forEach(x -> {if (x < lo \|\| x >= hi)
419	fails.getAndIncrement(); });
420	}
421	}
422	assertEquals(0, fails.get());
423	}
424
425	/**
426	* Each of a parallel sized stream of bounded doubles is within bounds
427	*/
428	public void testBoundedDoubles() {
429	AtomicInteger fails = new AtomicInteger(0);
430	SplittableRandom r = new SplittableRandom();
431	long size = 456;
432	for (double least = 0.00011; least < 1.0e20; least *= 9) {
433	for (double bound = least * 1.0011; bound < 1.0e20; bound *= 17) {
434	final double lo = least, hi = bound;
435	r.doubles(size, lo, hi).parallel().
436	forEach(x -> {if (x < lo \|\| x >= hi)
437	fails.getAndIncrement(); });
438	}
439	}
440	assertEquals(0, fails.get());
441	}
442
443	/**
444	* A parallel unsized stream of ints generates at least 100 values
445	*/
446	public void testUnsizedIntsCount() {
447	LongAdder counter = new LongAdder();
448	SplittableRandom r = new SplittableRandom();
449	long size = 100;
450	r.ints().limit(size).parallel().forEach(x -> counter.increment());
451	assertEquals(size, counter.sum());
452	}
453
454	/**
455	* A parallel unsized stream of longs generates at least 100 values
456	*/
457	public void testUnsizedLongsCount() {
458	LongAdder counter = new LongAdder();
459	SplittableRandom r = new SplittableRandom();
460	long size = 100;
461	r.longs().limit(size).parallel().forEach(x -> counter.increment());
462	assertEquals(size, counter.sum());
463	}
464
465	/**
466	* A parallel unsized stream of doubles generates at least 100 values
467	*/
468	public void testUnsizedDoublesCount() {
469	LongAdder counter = new LongAdder();
470	SplittableRandom r = new SplittableRandom();
471	long size = 100;
472	r.doubles().limit(size).parallel().forEach(x -> counter.increment());
473	assertEquals(size, counter.sum());
474	}
475
476	/**
477	* A sequential unsized stream of ints generates at least 100 values
478	*/
479	public void testUnsizedIntsCountSeq() {
480	LongAdder counter = new LongAdder();
481	SplittableRandom r = new SplittableRandom();
482	long size = 100;
483	r.ints().limit(size).forEach(x -> counter.increment());
484	assertEquals(size, counter.sum());
485	}
486
487	/**
488	* A sequential unsized stream of longs generates at least 100 values
489	*/
490	public void testUnsizedLongsCountSeq() {
491	LongAdder counter = new LongAdder();
492	SplittableRandom r = new SplittableRandom();
493	long size = 100;
494	r.longs().limit(size).forEach(x -> counter.increment());
495	assertEquals(size, counter.sum());
496	}
497
498	/**
499	* A sequential unsized stream of doubles generates at least 100 values
500	*/
501	public void testUnsizedDoublesCountSeq() {
502	LongAdder counter = new LongAdder();
503	SplittableRandom r = new SplittableRandom();
504	long size = 100;
505	r.doubles().limit(size).forEach(x -> counter.increment());
506	assertEquals(size, counter.sum());
507	}
508
509	}