Better random number facilities in UnitTest

modules/beast_core/diagnostic/beast_UnitTest.cpp

@@ -69,10 +69,12 @@ void UnitTest::shutdown()
 {
 }
 
-ScopedPointer <UnitTest::Suite>& UnitTest::run (UnitTests* const runner)
+ScopedPointer <UnitTest::Suite>& UnitTest::run (
+    UnitTests* const runner)
 {
     bassert (runner != nullptr);
     m_runner = runner;
+    m_random = m_runner->m_random;
 
     m_suite = new Suite (m_className, m_packageName);
 
@@ -191,6 +193,14 @@ void UnitTest::failException ()
     m_runner->onFailure ();
 }
 
+Random& UnitTest::random()
+{
+    // This method's only valid while the test is being run!
+    bassert (m_runner != nullptr);
+
+    return m_random;
+}
+
 //------------------------------------------------------------------------------
 
 void UnitTest::finishCase ()
@@ -339,13 +349,17 @@ UnitTests::TestList UnitTests::selectStartupTests (TestList const& tests) const
     return list;
 }
 
-void UnitTests::runSelectedTests (String const& match, TestList const& tests)
+void UnitTests::runSelectedTests (String const& match, TestList const& tests, int64 randomSeed)
 {
-    runTests (selectTests (match, tests));
+    runTests (selectTests (match, tests), randomSeed);
 }
 
-void UnitTests::runTests (TestList const& tests)
+void UnitTests::runTests (TestList const& tests, int64 randomSeed)
 {
+    if (randomSeed == 0)
+        randomSeed = Random().nextInt (0x7fffffff);
+    m_random = Random (randomSeed);
+
     m_results = new Results;
     for (int i = 0; i < tests.size (); ++i)
     {

modules/beast_core/diagnostic/beast_UnitTest.h

@@ -311,6 +311,9 @@ public:
 
     void logReport (StringArray const& report);
 
+    /** Returns a shared RNG that all unit tests should use. */
+    Random& random();
+
 private:
     void finishCase ();
 
@@ -322,6 +325,7 @@ private:
     UnitTests* m_runner;
     ScopedPointer <Suite> m_suite;
     ScopedPointer <Case> m_case;
+    Random m_random;
 };
 
 //==============================================================================
@@ -467,13 +471,14 @@ public:
         @param tests An optional parameter containing a list of tests to match.
     */
     void runSelectedTests (String const& match = "",
-                           TestList const& tests = UnitTest::getAllTests ());
+                           TestList const& tests = UnitTest::getAllTests (),
+                           int64 randomSeed = 0);
 
     /** Runs the specified list of tests.
         @note The tests are run regardless of the run settings.
         @param tests The list of tests to run.
     */
-    void runTests (TestList const& tests);
+    void runTests (TestList const& tests, int64 randomSeed = 0);
 
 protected:
     friend class UnitTest;
@@ -503,6 +508,7 @@ private:
 private:
     bool m_assertOnFailure;
     ScopedPointer <Results> m_results;
+    Random m_random;
 };
 
 #endif

modules/beast_core/maths/beast_Random.h

@@ -30,7 +30,7 @@
 
     You can create a Random object and use it to generate a sequence of random numbers.
 */
-class BEAST_API Random : LeakChecked <Random>
+class Random
 {
 public:
     //==============================================================================