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. This set of 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 one different result. (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 one different result
     */
    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 one different result
     */
    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 one different result
     */
    public void testNextDouble() {
        SplittableRandom sr = new SplittableRandom();
        double f = sr.nextDouble();
        double 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 one different result
     */
    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 one different result
     */
    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 one different result
     */
    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 one different result
     */
    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 one different result
     */
    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 ok) {
        }
        try {
            java.util.stream.LongStream x = r.longs(-1L);
            shouldThrow();
        } catch (IllegalArgumentException ok) {
        }
        try {
            java.util.stream.DoubleStream x = r.doubles(-1L);
            shouldThrow();
        } catch (IllegalArgumentException ok) {
        }
    }

    /**
     * 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 ok) {
        }
        try {
            java.util.stream.LongStream x = r.longs(1, -2);
            shouldThrow();
        } catch (IllegalArgumentException ok) {
        }
        try {
            java.util.stream.DoubleStream x = r.doubles(0, 0);
            shouldThrow();
        } catch (IllegalArgumentException ok) {
        }
    }

    /**
     * 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(counter.sum(), size);
            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(counter.sum(), size);
            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(counter.sum(), size);
            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(fails.get(), 0);
    }

    /**
     * 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(fails.get(), 0);
    }

    /**
     * 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(fails.get(), 0);
    }

    /**
     * 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(counter.sum(), size);
    }

    /**
     * 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(counter.sum(), size);
    }


    /**
     * 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(counter.sum(), size);
    }

    /**
     * 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(counter.sum(), size);
    }

    /**
     * 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(counter.sum(), size);
    }


    /**
     * 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(counter.sum(), size);
    }


}
Revision:	1.2
Committed:	Thu Jul 11 23:06:47 2013 UTC (10 years, 10 months ago) by dl
Branch:	MAIN
Changes since 1.1:	+70 -0 lines
Log Message:	Improve nextDouble()
#	User	Rev	Content
1	dl	1.1	/*
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. This set of tests do not check for random number generator
28			* quality. But we check for minimal API compliance by requiring
29			* that repeated calls to nextX methods, up to NCALLS tries,
30			* produce at least one different result. (In some possible
31			* universe, a "correct" implementation might fail, but the odds
32			* are vastly less than that of encountering a hardware failure
33			* while running the test.) For bounded nextX methods, we sample
34			* various intervals across multiples of primes. In other tests,
35			* we repeat 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 one different result
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 one different result
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 one different result
76			*/
77			public void testNextDouble() {
78			SplittableRandom sr = new SplittableRandom();
79			double f = sr.nextDouble();
80			double 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 one different result
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 one different result
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 one different result
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 one different result
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 one different result
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 ok) {
290			}
291			try {
292			java.util.stream.LongStream x = r.longs(-1L);
293			shouldThrow();
294			} catch (IllegalArgumentException ok) {
295			}
296			try {
297			java.util.stream.DoubleStream x = r.doubles(-1L);
298			shouldThrow();
299			} catch (IllegalArgumentException ok) {
300			}
301			}
302
303			/**
304			* Invoking bounded ints, long, doubles, with illegal bounds throws
305			* IllegalArgumentException
306			*/
307			public void testBadStreamBounds() {
308			SplittableRandom r = new SplittableRandom();
309			try {
310			java.util.stream.IntStream x = r.ints(2, 1);
311			shouldThrow();
312			} catch (IllegalArgumentException ok) {
313			}
314			try {
315			java.util.stream.LongStream x = r.longs(1, -2);
316			shouldThrow();
317			} catch (IllegalArgumentException ok) {
318			}
319			try {
320			java.util.stream.DoubleStream x = r.doubles(0, 0);
321			shouldThrow();
322			} catch (IllegalArgumentException ok) {
323			}
324			}
325
326			/**
327			* A parallel sized stream of ints generates the given number of values
328			*/
329			public void testIntsCount() {
330			LongAdder counter = new LongAdder();
331			SplittableRandom r = new SplittableRandom();
332			long size = 0;
333			for (int reps = 0; reps < REPS; ++reps) {
334			counter.reset();
335			r.ints(size).parallel().forEach(x -> {counter.increment();});
336			assertEquals(counter.sum(), size);
337			size += 524959;
338			}
339			}
340
341			/**
342			* A parallel sized stream of longs generates the given number of values
343			*/
344			public void testLongsCount() {
345			LongAdder counter = new LongAdder();
346			SplittableRandom r = new SplittableRandom();
347			long size = 0;
348			for (int reps = 0; reps < REPS; ++reps) {
349			counter.reset();
350			r.longs(size).parallel().forEach(x -> {counter.increment();});
351			assertEquals(counter.sum(), size);
352			size += 524959;
353			}
354			}
355
356			/**
357			* A parallel sized stream of doubles generates the given number of values
358			*/
359			public void testDoublesCount() {
360			LongAdder counter = new LongAdder();
361			SplittableRandom r = new SplittableRandom();
362			long size = 0;
363			for (int reps = 0; reps < REPS; ++reps) {
364			counter.reset();
365			r.doubles(size).parallel().forEach(x -> {counter.increment();});
366			assertEquals(counter.sum(), size);
367			size += 524959;
368			}
369			}
370
371	dl	1.2
372	dl	1.1	/**
373			* Each of a parallel sized stream of bounded ints is within bounds
374			*/
375			public void testBoundedInts() {
376			AtomicInteger fails = new AtomicInteger(0);
377			SplittableRandom r = new SplittableRandom();
378			long size = 12345L;
379			for (int least = -15485867; least < MAX_INT_BOUND; least += 524959) {
380			for (int bound = least + 2; bound > least && bound < MAX_INT_BOUND; bound += 67867967) {
381			final int lo = least, hi = bound;
382			r.ints(size, lo, hi).parallel().
383			forEach(x -> {if (x < lo \|\| x >= hi)
384			fails.getAndIncrement(); });
385			}
386			}
387			assertEquals(fails.get(), 0);
388			}
389
390			/**
391			* Each of a parallel sized stream of bounded longs is within bounds
392			*/
393			public void testBoundedLongs() {
394			AtomicInteger fails = new AtomicInteger(0);
395			SplittableRandom r = new SplittableRandom();
396			long size = 123L;
397			for (long least = -86028121; least < MAX_LONG_BOUND; least += 1982451653L) {
398			for (long bound = least + 2; bound > least && bound < MAX_LONG_BOUND; bound += Math.abs(bound * 7919)) {
399			final long lo = least, hi = bound;
400			r.longs(size, lo, hi).parallel().
401			forEach(x -> {if (x < lo \|\| x >= hi)
402			fails.getAndIncrement(); });
403			}
404			}
405			assertEquals(fails.get(), 0);
406			}
407
408			/**
409			* Each of a parallel sized stream of bounded doubles is within bounds
410			*/
411			public void testBoundedDoubles() {
412			AtomicInteger fails = new AtomicInteger(0);
413			SplittableRandom r = new SplittableRandom();
414			long size = 456;
415			for (double least = 0.00011; least < 1.0e20; least *= 9) {
416			for (double bound = least * 1.0011; bound < 1.0e20; bound *= 17) {
417			final double lo = least, hi = bound;
418			r.doubles(size, lo, hi).parallel().
419			forEach(x -> {if (x < lo \|\| x >= hi)
420			fails.getAndIncrement(); });
421			}
422			}
423			assertEquals(fails.get(), 0);
424			}
425
426	dl	1.2	/**
427			* A parallel unsized stream of ints generates at least 100 values
428			*/
429			public void testUnsizedIntsCount() {
430			LongAdder counter = new LongAdder();
431			SplittableRandom r = new SplittableRandom();
432			long size = 100;
433			r.ints().limit(size).parallel().forEach(x -> {counter.increment();});
434			assertEquals(counter.sum(), size);
435			}
436
437			/**
438			* A parallel unsized stream of longs generates at least 100 values
439			*/
440			public void testUnsizedLongsCount() {
441			LongAdder counter = new LongAdder();
442			SplittableRandom r = new SplittableRandom();
443			long size = 100;
444			r.longs().limit(size).parallel().forEach(x -> {counter.increment();});
445			assertEquals(counter.sum(), size);
446			}
447
448
449			/**
450			* A parallel unsized stream of doubles generates at least 100 values
451			*/
452			public void testUnsizedDoublesCount() {
453			LongAdder counter = new LongAdder();
454			SplittableRandom r = new SplittableRandom();
455			long size = 100;
456			r.doubles().limit(size).parallel().forEach(x -> {counter.increment();});
457			assertEquals(counter.sum(), size);
458			}
459
460			/**
461			* A sequential unsized stream of ints generates at least 100 values
462			*/
463			public void testUnsizedIntsCountSeq() {
464			LongAdder counter = new LongAdder();
465			SplittableRandom r = new SplittableRandom();
466			long size = 100;
467			r.ints().limit(size).forEach(x -> {counter.increment();});
468			assertEquals(counter.sum(), size);
469			}
470
471			/**
472			* A sequential unsized stream of longs generates at least 100 values
473			*/
474			public void testUnsizedLongsCountSeq() {
475			LongAdder counter = new LongAdder();
476			SplittableRandom r = new SplittableRandom();
477			long size = 100;
478			r.longs().limit(size).forEach(x -> {counter.increment();});
479			assertEquals(counter.sum(), size);
480			}
481
482
483			/**
484			* A sequential unsized stream of doubles generates at least 100 values
485			*/
486			public void testUnsizedDoublesCountSeq() {
487			LongAdder counter = new LongAdder();
488			SplittableRandom r = new SplittableRandom();
489			long size = 100;
490			r.doubles().limit(size).forEach(x -> {counter.increment();});
491			assertEquals(counter.sum(), size);
492			}
493
494
495	dl	1.1	}