From f9a060d3e46fbfb0daefc0623fa217a62e5c8c2b Mon Sep 17 00:00:00 2001
From: Daniel Karbach <daniel.karbach@localhorst.tv>
Date: Wed, 9 Nov 2016 17:46:08 +0100
Subject: [PATCH] fix rng stability test

also check 0 special case
---
 tst/rand/StabilityTest.cpp | 43 ++++++++++++++++++++++++--------------
 1 file changed, 27 insertions(+), 16 deletions(-)

diff --git a/tst/rand/StabilityTest.cpp b/tst/rand/StabilityTest.cpp
index 9ed047d..928cdd6 100644
--- a/tst/rand/StabilityTest.cpp
+++ b/tst/rand/StabilityTest.cpp
@@ -68,6 +68,7 @@ void StabilityTest::testRNG() {
 		"unexpected value #8 from RNG",
 		uint16_t(0x0000), value
 	);
+	random(value);
 	CPPUNIT_ASSERT_EQUAL_MESSAGE(
 		"unexpected value #9 from RNG",
 		uint16_t(0x0000), value
@@ -80,12 +81,12 @@ void StabilityTest::testRNG() {
 	random(value);
 	CPPUNIT_ASSERT_EQUAL_MESSAGE(
 		"unexpected value #11 from RNG",
-		uint16_t(0x0000), value
+		uint16_t(0x2E70), value
 	);
 	random(value);
 	CPPUNIT_ASSERT_EQUAL_MESSAGE(
 		"unexpected value #12 from RNG",
-		uint16_t(0x2E70), value
+		uint16_t(0x0000), value
 	);
 	random(value);
 	CPPUNIT_ASSERT_EQUAL_MESSAGE(
@@ -100,12 +101,12 @@ void StabilityTest::testRNG() {
 	random(value);
 	CPPUNIT_ASSERT_EQUAL_MESSAGE(
 		"unexpected value #15 from RNG",
-		uint16_t(0x0000), value
+		uint16_t(0x1011), value
 	);
 	random(value);
 	CPPUNIT_ASSERT_EQUAL_MESSAGE(
 		"unexpected value #16 from RNG",
-		uint16_t(0x1011), value
+		uint16_t(0x0000), value
 	);
 	random(value);
 	CPPUNIT_ASSERT_EQUAL_MESSAGE(
@@ -115,17 +116,17 @@ void StabilityTest::testRNG() {
 	random(value);
 	CPPUNIT_ASSERT_EQUAL_MESSAGE(
 		"unexpected value #18 from RNG",
-		uint16_t(0x0000), value
+		uint16_t(0xB000), value
 	);
 	random(value);
 	CPPUNIT_ASSERT_EQUAL_MESSAGE(
 		"unexpected value #19 from RNG",
-		uint16_t(0xB000), value
+		uint16_t(0x0B0B), value
 	);
 	random(value);
 	CPPUNIT_ASSERT_EQUAL_MESSAGE(
 		"unexpected value #20 from RNG",
-		uint16_t(0x0B0B), value
+		uint16_t(0x0000), value
 	);
 	random(value);
 	CPPUNIT_ASSERT_EQUAL_MESSAGE(
@@ -135,17 +136,17 @@ void StabilityTest::testRNG() {
 	random(value);
 	CPPUNIT_ASSERT_EQUAL_MESSAGE(
 		"unexpected value #22 from RNG",
-		uint16_t(0x0000), value
+		uint16_t(0x1500), value
 	);
 	random(value);
 	CPPUNIT_ASSERT_EQUAL_MESSAGE(
 		"unexpected value #23 from RNG",
-		uint16_t(0x1500), value
+		uint16_t(0x0454), value
 	);
 	random(value);
 	CPPUNIT_ASSERT_EQUAL_MESSAGE(
 		"unexpected value #24 from RNG",
-		uint16_t(0x0454), value
+		uint16_t(0x0000), value
 	);
 	random(value);
 	CPPUNIT_ASSERT_EQUAL_MESSAGE(
@@ -155,17 +156,17 @@ void StabilityTest::testRNG() {
 	random(value);
 	CPPUNIT_ASSERT_EQUAL_MESSAGE(
 		"unexpected value #26 from RNG",
-		uint16_t(0x0000), value
+		uint16_t(0xC970), value
 	);
 	random(value);
 	CPPUNIT_ASSERT_EQUAL_MESSAGE(
 		"unexpected value #27 from RNG",
-		uint16_t(0xC970), value
+		uint16_t(0x02E5), value
 	);
 	random(value);
 	CPPUNIT_ASSERT_EQUAL_MESSAGE(
 		"unexpected value #28 from RNG",
-		uint16_t(0x02E5), value
+		uint16_t(0x0000), value
 	);
 	random(value);
 	CPPUNIT_ASSERT_EQUAL_MESSAGE(
@@ -175,17 +176,27 @@ void StabilityTest::testRNG() {
 	random(value);
 	CPPUNIT_ASSERT_EQUAL_MESSAGE(
 		"unexpected value #30 from RNG",
-		uint16_t(0x0000), value
+		uint16_t(0x0101), value
 	);
 	random(value);
 	CPPUNIT_ASSERT_EQUAL_MESSAGE(
 		"unexpected value #31 from RNG",
-		uint16_t(0x0101), value
+		uint16_t(0x0100), value
 	);
 	random(value);
 	CPPUNIT_ASSERT_EQUAL_MESSAGE(
 		"unexpected value #32 from RNG",
-		uint16_t(0x0100), value
+		uint16_t(0x0000), value
+	);
+
+	GaloisLFSR random1(1);
+	uint16_t value1;
+	for (int i = 0; i < 32; ++i) {
+		random1(value1);
+	}
+	CPPUNIT_ASSERT_EQUAL_MESSAGE(
+		"RNG with seeds 0 and 1 differ",
+		value, value1
 	);
 }
 
-- 
2.39.2