Allow testing ordering to be specified as declaration, lexicographical, or random. Allow random seed to be specified

include/internal/catch_commandline.hpp

@@ -29,7 +29,28 @@ namespace Catch {
             config.warnings = static_cast<WarnAbout::What>( config.warnings | WarnAbout::NoAssertions );
         else
             throw std::runtime_error( "Unrecognised warning: '" + _warning + "'" );
-
+    }
+    inline void setOrder( ConfigData& config, std::string const& order ) {
+        if( startsWith( "declared", order ) )
+            config.runOrder = RunTests::InDeclarationOrder;
+        else if( startsWith( "lexical", order ) )
+            config.runOrder = RunTests::InLexicographicalOrder;
+        else if( startsWith( "random", order ) )
+            config.runOrder = RunTests::InRandomOrder;
+        else
+            throw std::runtime_error( "Unrecognised ordering: '" + order + "'" );
+    }
+    inline void setRngSeed( ConfigData& config, std::string const& seed ) {
+        if( seed == "time" ) {
+            config.rngSeed = static_cast<unsigned int>( std::time(0) );
+        }
+        else {
+            std::stringstream ss;
+            ss << seed;
+            ss >> config.rngSeed;
+            if( ss.fail() )
+                throw std::runtime_error( "Argment to --rng-seed should be the word 'time' or a number" );
+        }
     }
     inline void setVerbosity( ConfigData& config, int level ) {
         // !TBD: accept strings?
@@ -137,10 +158,18 @@ namespace Catch {
             .describe( "list all/matching test cases names only" )
             .bind( &ConfigData::listTestNamesOnly );
 
-        cli["--list-reporters"]
+        cli["--list-reporters"] 
             .describe( "list all reporters" )
             .bind( &ConfigData::listReporters );
 
+        cli["--order"]
+            .describe( "test case order (defaults to decl)" )
+            .bind( &setOrder, "decl|lex|rand" );
+
+        cli["--rng-seed"]
+            .describe( "set a specific seed for random numbers" )
+            .bind( &setRngSeed, "'time'|number" );
+
         return cli;
     }
 

include/internal/catch_config.hpp

@@ -17,6 +17,7 @@
 #include <vector>
 #include <string>
 #include <iostream>
+#include <ctime>
 
 #ifndef CATCH_CONFIG_CONSOLE_WIDTH
 #define CATCH_CONFIG_CONSOLE_WIDTH 80
@@ -37,9 +38,11 @@ namespace Catch {
             showHelp( false ),
             showInvisibles( false ),
             abortAfter( -1 ),
+            rngSeed( 0 ),
             verbosity( Verbosity::Normal ),
             warnings( WarnAbout::Nothing ),
-            showDurations( ShowDurations::DefaultForReporter )
+            showDurations( ShowDurations::DefaultForReporter ),
+            runOrder( RunTests::InDeclarationOrder )
         {}
 
         bool listTests;
@@ -54,10 +57,12 @@ namespace Catch {
         bool showInvisibles;
 
         int abortAfter;
+        unsigned int rngSeed;
 
         Verbosity::Level verbosity;
         WarnAbout::What warnings;
         ShowDurations::OrNot showDurations;
+        RunTests::InWhatOrder runOrder;
 
         std::string reporterName;
         std::string outputFilename;
@@ -141,7 +146,8 @@ namespace Catch {
         virtual bool includeSuccessfulResults() const   { return m_data.showSuccessfulTests; }
         virtual bool warnAboutMissingAssertions() const { return m_data.warnings & WarnAbout::NoAssertions; }
         virtual ShowDurations::OrNot showDurations() const { return m_data.showDurations; }
-
+        virtual RunTests::InWhatOrder runOrder() const  { return m_data.runOrder; }
+        virtual unsigned int rngSeed() const    { return m_data.rngSeed; }
 
     private:
         ConfigData m_data;

include/internal/catch_interfaces_config.h

@@ -32,6 +32,11 @@ namespace Catch {
         Always,
         Never
     }; };
+    struct RunTests { enum InWhatOrder {
+        InDeclarationOrder,
+        InLexicographicalOrder,
+        InRandomOrder
+    }; };
 
     class TestSpec;
 
@@ -49,6 +54,8 @@ namespace Catch {
         virtual bool showInvisibles() const = 0;
         virtual ShowDurations::OrNot showDurations() const = 0;
         virtual TestSpec const& testSpec() const = 0;
+        virtual RunTests::InWhatOrder runOrder() const = 0;
+        virtual unsigned int rngSeed() const = 0;
     };
 }
 

include/internal/catch_test_case_registry_impl.hpp

@@ -59,7 +59,15 @@ namespace Catch {
             return m_nonHiddenFunctions;
         }
 
+        struct LexSort {
+            bool operator() (TestCase i,TestCase j) { return (i<j);}
+        };
+
         virtual void getFilteredTests( TestSpec const& testSpec, IConfig const& config, std::vector<TestCase>& matchingTestCases ) const {
+            struct RandomNumberGenerator {
+                int operator()( int n ) { return std::rand() % n; }
+            };
+
             for( std::vector<TestCase>::const_iterator  it = m_functionsInOrder.begin(),
                                                         itEnd = m_functionsInOrder.end();
                     it != itEnd;
@@ -67,6 +75,17 @@ namespace Catch {
                 if( testSpec.matches( *it ) && ( config.allowThrows() || !it->throws() ) )
                     matchingTestCases.push_back( *it );
             }
+            switch( config.runOrder() ) {
+                case RunTests::InLexicographicalOrder:
+                    std::sort( matchingTestCases.begin(), matchingTestCases.end(), LexSort() );
+                    break;
+                case RunTests::InRandomOrder:
+                    std::random_shuffle( matchingTestCases.begin(), matchingTestCases.end(), RandomNumberGenerator() );
+                    break;
+                case RunTests::InDeclarationOrder:
+                    // already in declaration order
+                    break;
+            }
         }
 
     private: