Add validation for --benchmark-samples to prevent crash with zero value (#3056)

* Add validation for --benchmark-samples to prevent crash with zero samples
* Add automated test for benchmark samples validation
* Update baselines for benchmark-samples validation
* Add missing test for benchmark samples validation

---------

Co-authored-by: Chan Aung <chan@Thinkpad.localdomain>

src/catch2/internal/catch_commandline.cpp

@@ -189,6 +189,19 @@ namespace Catch {
             config.shardCount = *parsedCount;
             return ParserResult::ok( ParseResultType::Matched );
         };
+        auto const setBenchmarkSamples = [&]( std::string const& samples ) {
+        auto parsedSamples = parseUInt( samples );
+        if ( !parsedSamples ) {
+            return ParserResult::runtimeError(
+                "Could not parse '" + samples + "' as benchmark samples" );
+        }
+        if ( *parsedSamples == 0 ) {
+            return ParserResult::runtimeError(
+                "Benchmark samples must be greater than 0" );
+        }
+        config.benchmarkSamples = *parsedSamples;
+        return ParserResult::ok( ParseResultType::Matched );
+    };
 
         auto const setShardIndex = [&](std::string const& shardIndex) {
             auto parsedIndex = parseUInt( shardIndex );
@@ -281,7 +294,7 @@ namespace Catch {
             | Opt( config.skipBenchmarks)
                 ["--skip-benchmarks"]
                 ( "disable running benchmarks")
-            | Opt( config.benchmarkSamples, "samples" )
+            | Opt( setBenchmarkSamples, "samples"  )
                 ["--benchmark-samples"]
                 ( "number of samples to collect (default: 100)" )
             | Opt( config.benchmarkResamples, "resamples" )

tests/SelfTest/Baselines/compact.sw.approved.txt

@@ -1503,6 +1503,10 @@ CmdLine.tests.cpp:<line number>: passed: !result for: true
 CmdLine.tests.cpp:<line number>: passed: result.errorMessage(), ContainsSubstring( "colour mode must be one of" ) for: "colour mode must be one of: default, ansi, win32, or none. 'wrong' is not recognised" contains: "colour mode must be one of"
 CmdLine.tests.cpp:<line number>: passed: cli.parse({ "test", "--benchmark-samples=200" }) for: {?}
 CmdLine.tests.cpp:<line number>: passed: config.benchmarkSamples == 200 for: 200 == 200
+CmdLine.tests.cpp:<line number>: passed: !(result) for: !{?}
+CmdLine.tests.cpp:<line number>: passed: result.errorMessage(), ContainsSubstring("Benchmark samples must be greater than 0") for: "Benchmark samples must be greater than 0" contains: "Benchmark samples must be greater than 0"
+CmdLine.tests.cpp:<line number>: passed: !(result) for: !{?}
+CmdLine.tests.cpp:<line number>: passed: result.errorMessage(), ContainsSubstring("Could not parse 'abc' as benchmark samples") for: "Could not parse 'abc' as benchmark samples" contains: "Could not parse 'abc' as benchmark samples"
 CmdLine.tests.cpp:<line number>: passed: cli.parse({ "test", "--benchmark-resamples=20000" }) for: {?}
 CmdLine.tests.cpp:<line number>: passed: config.benchmarkResamples == 20000 for: 20000 (0x<hex digits>) == 20000 (0x<hex digits>)
 CmdLine.tests.cpp:<line number>: passed: cli.parse({ "test", "--benchmark-confidence-interval=0.99" }) for: {?}
@@ -2891,6 +2895,6 @@ InternalBenchmark.tests.cpp:<line number>: passed: q3 == 23. for: 23.0 == 23.0
 Misc.tests.cpp:<line number>: passed:
 Misc.tests.cpp:<line number>: passed:
 test cases:  436 |  317 passed |  95 failed | 6 skipped | 18 failed as expected
-assertions: 2305 | 2106 passed | 157 failed | 42 failed as expected
+assertions: 2309 | 2110 passed | 157 failed | 42 failed as expected
 
 

tests/SelfTest/Baselines/compact.sw.multi.approved.txt

@@ -1501,6 +1501,10 @@ CmdLine.tests.cpp:<line number>: passed: !result for: true
 CmdLine.tests.cpp:<line number>: passed: result.errorMessage(), ContainsSubstring( "colour mode must be one of" ) for: "colour mode must be one of: default, ansi, win32, or none. 'wrong' is not recognised" contains: "colour mode must be one of"
 CmdLine.tests.cpp:<line number>: passed: cli.parse({ "test", "--benchmark-samples=200" }) for: {?}
 CmdLine.tests.cpp:<line number>: passed: config.benchmarkSamples == 200 for: 200 == 200
+CmdLine.tests.cpp:<line number>: passed: !(result) for: !{?}
+CmdLine.tests.cpp:<line number>: passed: result.errorMessage(), ContainsSubstring("Benchmark samples must be greater than 0") for: "Benchmark samples must be greater than 0" contains: "Benchmark samples must be greater than 0"
+CmdLine.tests.cpp:<line number>: passed: !(result) for: !{?}
+CmdLine.tests.cpp:<line number>: passed: result.errorMessage(), ContainsSubstring("Could not parse 'abc' as benchmark samples") for: "Could not parse 'abc' as benchmark samples" contains: "Could not parse 'abc' as benchmark samples"
 CmdLine.tests.cpp:<line number>: passed: cli.parse({ "test", "--benchmark-resamples=20000" }) for: {?}
 CmdLine.tests.cpp:<line number>: passed: config.benchmarkResamples == 20000 for: 20000 (0x<hex digits>) == 20000 (0x<hex digits>)
 CmdLine.tests.cpp:<line number>: passed: cli.parse({ "test", "--benchmark-confidence-interval=0.99" }) for: {?}
@@ -2880,6 +2884,6 @@ InternalBenchmark.tests.cpp:<line number>: passed: q3 == 23. for: 23.0 == 23.0
 Misc.tests.cpp:<line number>: passed:
 Misc.tests.cpp:<line number>: passed:
 test cases:  436 |  317 passed |  95 failed | 6 skipped | 18 failed as expected
-assertions: 2305 | 2106 passed | 157 failed | 42 failed as expected
+assertions: 2309 | 2110 passed | 157 failed | 42 failed as expected
 
 

tests/SelfTest/Baselines/console.std.approved.txt

@@ -1731,5 +1731,5 @@ due to unexpected exception with message:
 
 ===============================================================================
 test cases:  436 |  335 passed |  76 failed | 7 skipped | 18 failed as expected
-assertions: 2284 | 2106 passed | 136 failed | 42 failed as expected
+assertions: 2288 | 2110 passed | 136 failed | 42 failed as expected
 

tests/SelfTest/Baselines/console.sw.approved.txt

@@ -9987,6 +9987,44 @@ CmdLine.tests.cpp:<line number>: PASSED:
 with expansion:
   200 == 200
 
+-------------------------------------------------------------------------------
+Process can be configured on command line
+  Benchmark options
+  samples must be greater than zero
+-------------------------------------------------------------------------------
+CmdLine.tests.cpp:<line number>
+...............................................................................
+
+CmdLine.tests.cpp:<line number>: PASSED:
+  CHECK_FALSE( result )
+with expansion:
+  !{?}
+
+CmdLine.tests.cpp:<line number>: PASSED:
+  REQUIRE_THAT( result.errorMessage(), ContainsSubstring("Benchmark samples must be greater than 0") )
+with expansion:
+  "Benchmark samples must be greater than 0" contains: "Benchmark samples must
+  be greater than 0"
+
+-------------------------------------------------------------------------------
+Process can be configured on command line
+  Benchmark options
+  samples must be parseable
+-------------------------------------------------------------------------------
+CmdLine.tests.cpp:<line number>
+...............................................................................
+
+CmdLine.tests.cpp:<line number>: PASSED:
+  CHECK_FALSE( result )
+with expansion:
+  !{?}
+
+CmdLine.tests.cpp:<line number>: PASSED:
+  REQUIRE_THAT( result.errorMessage(), ContainsSubstring("Could not parse 'abc' as benchmark samples") )
+with expansion:
+  "Could not parse 'abc' as benchmark samples" contains: "Could not parse 'abc'
+  as benchmark samples"
+
 -------------------------------------------------------------------------------
 Process can be configured on command line
   Benchmark options
@@ -19312,5 +19350,5 @@ Misc.tests.cpp:<line number>: PASSED:
 
 ===============================================================================
 test cases:  436 |  317 passed |  95 failed | 6 skipped | 18 failed as expected
-assertions: 2305 | 2106 passed | 157 failed | 42 failed as expected
+assertions: 2309 | 2110 passed | 157 failed | 42 failed as expected
 

tests/SelfTest/Baselines/console.sw.multi.approved.txt

@@ -9985,6 +9985,44 @@ CmdLine.tests.cpp:<line number>: PASSED:
 with expansion:
   200 == 200
 
+-------------------------------------------------------------------------------
+Process can be configured on command line
+  Benchmark options
+  samples must be greater than zero
+-------------------------------------------------------------------------------
+CmdLine.tests.cpp:<line number>
+...............................................................................
+
+CmdLine.tests.cpp:<line number>: PASSED:
+  CHECK_FALSE( result )
+with expansion:
+  !{?}
+
+CmdLine.tests.cpp:<line number>: PASSED:
+  REQUIRE_THAT( result.errorMessage(), ContainsSubstring("Benchmark samples must be greater than 0") )
+with expansion:
+  "Benchmark samples must be greater than 0" contains: "Benchmark samples must
+  be greater than 0"
+
+-------------------------------------------------------------------------------
+Process can be configured on command line
+  Benchmark options
+  samples must be parseable
+-------------------------------------------------------------------------------
+CmdLine.tests.cpp:<line number>
+...............................................................................
+
+CmdLine.tests.cpp:<line number>: PASSED:
+  CHECK_FALSE( result )
+with expansion:
+  !{?}
+
+CmdLine.tests.cpp:<line number>: PASSED:
+  REQUIRE_THAT( result.errorMessage(), ContainsSubstring("Could not parse 'abc' as benchmark samples") )
+with expansion:
+  "Could not parse 'abc' as benchmark samples" contains: "Could not parse 'abc'
+  as benchmark samples"
+
 -------------------------------------------------------------------------------
 Process can be configured on command line
   Benchmark options
@@ -19301,5 +19339,5 @@ Misc.tests.cpp:<line number>: PASSED:
 
 ===============================================================================
 test cases:  436 |  317 passed |  95 failed | 6 skipped | 18 failed as expected
-assertions: 2305 | 2106 passed | 157 failed | 42 failed as expected
+assertions: 2309 | 2110 passed | 157 failed | 42 failed as expected
 

tests/SelfTest/Baselines/junit.sw.approved.txt

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <testsuitesloose text artifact
 >
-  <testsuite name="<exe-name>" errors="17" failures="140" skipped="12" tests="2317" hostname="tbd" time="{duration}" timestamp="{iso8601-timestamp}">
+  <testsuite name="<exe-name>" errors="17" failures="140" skipped="12" tests="2321" hostname="tbd" time="{duration}" timestamp="{iso8601-timestamp}">
     <properties>
       <property name="random-seed" value="1"/>
       <property name="filters" value="&quot;*&quot; ~[!nonportable] ~[!benchmark] ~[approvals]"/>
@@ -1325,6 +1325,8 @@ at Message.tests.cpp:<line number>
     <testcase classname="<exe-name>.global" name="Process can be configured on command line/use-colour/error" time="{duration}" status="run"/>
     <testcase classname="<exe-name>.global" name="Process can be configured on command line/Benchmark options" time="{duration}" status="run"/>
     <testcase classname="<exe-name>.global" name="Process can be configured on command line/Benchmark options/samples" time="{duration}" status="run"/>
+    <testcase classname="<exe-name>.global" name="Process can be configured on command line/Benchmark options/samples must be greater than zero" time="{duration}" status="run"/>
+    <testcase classname="<exe-name>.global" name="Process can be configured on command line/Benchmark options/samples must be parseable" time="{duration}" status="run"/>
     <testcase classname="<exe-name>.global" name="Process can be configured on command line/Benchmark options/resamples" time="{duration}" status="run"/>
     <testcase classname="<exe-name>.global" name="Process can be configured on command line/Benchmark options/confidence-interval" time="{duration}" status="run"/>
     <testcase classname="<exe-name>.global" name="Process can be configured on command line/Benchmark options/no-analysis" time="{duration}" status="run"/>

tests/SelfTest/Baselines/junit.sw.multi.approved.txt

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <testsuites>
-  <testsuite name="<exe-name>" errors="17" failures="140" skipped="12" tests="2317" hostname="tbd" time="{duration}" timestamp="{iso8601-timestamp}">
+  <testsuite name="<exe-name>" errors="17" failures="140" skipped="12" tests="2321" hostname="tbd" time="{duration}" timestamp="{iso8601-timestamp}">
     <properties>
       <property name="random-seed" value="1"/>
       <property name="filters" value="&quot;*&quot; ~[!nonportable] ~[!benchmark] ~[approvals]"/>
@@ -1324,6 +1324,8 @@ at Message.tests.cpp:<line number>
     <testcase classname="<exe-name>.global" name="Process can be configured on command line/use-colour/error" time="{duration}" status="run"/>
     <testcase classname="<exe-name>.global" name="Process can be configured on command line/Benchmark options" time="{duration}" status="run"/>
     <testcase classname="<exe-name>.global" name="Process can be configured on command line/Benchmark options/samples" time="{duration}" status="run"/>
+    <testcase classname="<exe-name>.global" name="Process can be configured on command line/Benchmark options/samples must be greater than zero" time="{duration}" status="run"/>
+    <testcase classname="<exe-name>.global" name="Process can be configured on command line/Benchmark options/samples must be parseable" time="{duration}" status="run"/>
     <testcase classname="<exe-name>.global" name="Process can be configured on command line/Benchmark options/resamples" time="{duration}" status="run"/>
     <testcase classname="<exe-name>.global" name="Process can be configured on command line/Benchmark options/confidence-interval" time="{duration}" status="run"/>
     <testcase classname="<exe-name>.global" name="Process can be configured on command line/Benchmark options/no-analysis" time="{duration}" status="run"/>

tests/SelfTest/Baselines/sonarqube.sw.approved.txt

@@ -119,6 +119,8 @@ at AssertionHandler.tests.cpp:<line number>
     <testCase name="Process can be configured on command line/use-colour/error" duration="{duration}"/>
     <testCase name="Process can be configured on command line/Benchmark options" duration="{duration}"/>
     <testCase name="Process can be configured on command line/Benchmark options/samples" duration="{duration}"/>
+    <testCase name="Process can be configured on command line/Benchmark options/samples must be greater than zero" duration="{duration}"/>
+    <testCase name="Process can be configured on command line/Benchmark options/samples must be parseable" duration="{duration}"/>
     <testCase name="Process can be configured on command line/Benchmark options/resamples" duration="{duration}"/>
     <testCase name="Process can be configured on command line/Benchmark options/confidence-interval" duration="{duration}"/>
     <testCase name="Process can be configured on command line/Benchmark options/no-analysis" duration="{duration}"/>

tests/SelfTest/Baselines/sonarqube.sw.multi.approved.txt

@@ -118,6 +118,8 @@ at AssertionHandler.tests.cpp:<line number>
     <testCase name="Process can be configured on command line/use-colour/error" duration="{duration}"/>
     <testCase name="Process can be configured on command line/Benchmark options" duration="{duration}"/>
     <testCase name="Process can be configured on command line/Benchmark options/samples" duration="{duration}"/>
+    <testCase name="Process can be configured on command line/Benchmark options/samples must be greater than zero" duration="{duration}"/>
+    <testCase name="Process can be configured on command line/Benchmark options/samples must be parseable" duration="{duration}"/>
     <testCase name="Process can be configured on command line/Benchmark options/resamples" duration="{duration}"/>
     <testCase name="Process can be configured on command line/Benchmark options/confidence-interval" duration="{duration}"/>
     <testCase name="Process can be configured on command line/Benchmark options/no-analysis" duration="{duration}"/>

tests/SelfTest/Baselines/tap.sw.approved.txt

@@ -2485,6 +2485,14 @@ ok {test-number} - cli.parse({ "test", "--benchmark-samples=200" }) for: {?}
 # Process can be configured on command line
 ok {test-number} - config.benchmarkSamples == 200 for: 200 == 200
 # Process can be configured on command line
+ok {test-number} - !(result) for: !{?}
+# Process can be configured on command line
+ok {test-number} - result.errorMessage(), ContainsSubstring("Benchmark samples must be greater than 0") for: "Benchmark samples must be greater than 0" contains: "Benchmark samples must be greater than 0"
+# Process can be configured on command line
+ok {test-number} - !(result) for: !{?}
+# Process can be configured on command line
+ok {test-number} - result.errorMessage(), ContainsSubstring("Could not parse 'abc' as benchmark samples") for: "Could not parse 'abc' as benchmark samples" contains: "Could not parse 'abc' as benchmark samples"
+# Process can be configured on command line
 ok {test-number} - cli.parse({ "test", "--benchmark-resamples=20000" }) for: {?}
 # Process can be configured on command line
 ok {test-number} - config.benchmarkResamples == 20000 for: 20000 (0x<hex digits>) == 20000 (0x<hex digits>)
@@ -4631,5 +4639,5 @@ ok {test-number} - q3 == 23. for: 23.0 == 23.0
 ok {test-number} -
 # xmlentitycheck
 ok {test-number} -
-1..2317
+1..2321
 

tests/SelfTest/Baselines/tap.sw.multi.approved.txt

@@ -2483,6 +2483,14 @@ ok {test-number} - cli.parse({ "test", "--benchmark-samples=200" }) for: {?}
 # Process can be configured on command line
 ok {test-number} - config.benchmarkSamples == 200 for: 200 == 200
 # Process can be configured on command line
+ok {test-number} - !(result) for: !{?}
+# Process can be configured on command line
+ok {test-number} - result.errorMessage(), ContainsSubstring("Benchmark samples must be greater than 0") for: "Benchmark samples must be greater than 0" contains: "Benchmark samples must be greater than 0"
+# Process can be configured on command line
+ok {test-number} - !(result) for: !{?}
+# Process can be configured on command line
+ok {test-number} - result.errorMessage(), ContainsSubstring("Could not parse 'abc' as benchmark samples") for: "Could not parse 'abc' as benchmark samples" contains: "Could not parse 'abc' as benchmark samples"
+# Process can be configured on command line
 ok {test-number} - cli.parse({ "test", "--benchmark-resamples=20000" }) for: {?}
 # Process can be configured on command line
 ok {test-number} - config.benchmarkResamples == 20000 for: 20000 (0x<hex digits>) == 20000 (0x<hex digits>)
@@ -4620,5 +4628,5 @@ ok {test-number} - q3 == 23. for: 23.0 == 23.0
 ok {test-number} -
 # xmlentitycheck
 ok {test-number} -
-1..2317
+1..2321
 

tests/SelfTest/Baselines/xml.sw.approved.txt

@@ -11987,6 +11987,50 @@ Approx( 1.21999999999999997 )
       </Section>
       <OverallResults successes="2" failures="0" expectedFailures="0" skipped="false"/>
     </Section>
+    <Section name="Benchmark options" filename="tests/<exe-name>/IntrospectiveTests/CmdLine.tests.cpp" >
+      <Section name="samples must be greater than zero" filename="tests/<exe-name>/IntrospectiveTests/CmdLine.tests.cpp" >
+        <Expression success="true" type="CHECK_FALSE" filename="tests/<exe-name>/IntrospectiveTests/CmdLine.tests.cpp" >
+          <Original>
+            !(result)
+          </Original>
+          <Expanded>
+            !{?}
+          </Expanded>
+        </Expression>
+        <Expression success="true" type="REQUIRE_THAT" filename="tests/<exe-name>/IntrospectiveTests/CmdLine.tests.cpp" >
+          <Original>
+            result.errorMessage(), ContainsSubstring("Benchmark samples must be greater than 0")
+          </Original>
+          <Expanded>
+            "Benchmark samples must be greater than 0" contains: "Benchmark samples must be greater than 0"
+          </Expanded>
+        </Expression>
+        <OverallResults successes="2" failures="0" expectedFailures="0" skipped="false"/>
+      </Section>
+      <OverallResults successes="2" failures="0" expectedFailures="0" skipped="false"/>
+    </Section>
+    <Section name="Benchmark options" filename="tests/<exe-name>/IntrospectiveTests/CmdLine.tests.cpp" >
+      <Section name="samples must be parseable" filename="tests/<exe-name>/IntrospectiveTests/CmdLine.tests.cpp" >
+        <Expression success="true" type="CHECK_FALSE" filename="tests/<exe-name>/IntrospectiveTests/CmdLine.tests.cpp" >
+          <Original>
+            !(result)
+          </Original>
+          <Expanded>
+            !{?}
+          </Expanded>
+        </Expression>
+        <Expression success="true" type="REQUIRE_THAT" filename="tests/<exe-name>/IntrospectiveTests/CmdLine.tests.cpp" >
+          <Original>
+            result.errorMessage(), ContainsSubstring("Could not parse 'abc' as benchmark samples")
+          </Original>
+          <Expanded>
+            "Could not parse 'abc' as benchmark samples" contains: "Could not parse 'abc' as benchmark samples"
+          </Expanded>
+        </Expression>
+        <OverallResults successes="2" failures="0" expectedFailures="0" skipped="false"/>
+      </Section>
+      <OverallResults successes="2" failures="0" expectedFailures="0" skipped="false"/>
+    </Section>
     <Section name="Benchmark options" filename="tests/<exe-name>/IntrospectiveTests/CmdLine.tests.cpp" >
       <Section name="resamples" filename="tests/<exe-name>/IntrospectiveTests/CmdLine.tests.cpp" >
         <Expression success="true" type="CHECK" filename="tests/<exe-name>/IntrospectiveTests/CmdLine.tests.cpp" >
@@ -22349,6 +22393,6 @@ Approx( -1.95996398454005449 )
     </Section>
     <OverallResult success="true" skips="0"/>
   </TestCase>
-  <OverallResults successes="2106" failures="157" expectedFailures="42" skips="12"/>
+  <OverallResults successes="2110" failures="157" expectedFailures="42" skips="12"/>
   <OverallResultsCases successes="317" failures="95" expectedFailures="18" skips="6"/>
 </Catch2TestRun>

tests/SelfTest/Baselines/xml.sw.multi.approved.txt

@@ -11987,6 +11987,50 @@ Approx( 1.21999999999999997 )
       </Section>
       <OverallResults successes="2" failures="0" expectedFailures="0" skipped="false"/>
     </Section>
+    <Section name="Benchmark options" filename="tests/<exe-name>/IntrospectiveTests/CmdLine.tests.cpp" >
+      <Section name="samples must be greater than zero" filename="tests/<exe-name>/IntrospectiveTests/CmdLine.tests.cpp" >
+        <Expression success="true" type="CHECK_FALSE" filename="tests/<exe-name>/IntrospectiveTests/CmdLine.tests.cpp" >
+          <Original>
+            !(result)
+          </Original>
+          <Expanded>
+            !{?}
+          </Expanded>
+        </Expression>
+        <Expression success="true" type="REQUIRE_THAT" filename="tests/<exe-name>/IntrospectiveTests/CmdLine.tests.cpp" >
+          <Original>
+            result.errorMessage(), ContainsSubstring("Benchmark samples must be greater than 0")
+          </Original>
+          <Expanded>
+            "Benchmark samples must be greater than 0" contains: "Benchmark samples must be greater than 0"
+          </Expanded>
+        </Expression>
+        <OverallResults successes="2" failures="0" expectedFailures="0" skipped="false"/>
+      </Section>
+      <OverallResults successes="2" failures="0" expectedFailures="0" skipped="false"/>
+    </Section>
+    <Section name="Benchmark options" filename="tests/<exe-name>/IntrospectiveTests/CmdLine.tests.cpp" >
+      <Section name="samples must be parseable" filename="tests/<exe-name>/IntrospectiveTests/CmdLine.tests.cpp" >
+        <Expression success="true" type="CHECK_FALSE" filename="tests/<exe-name>/IntrospectiveTests/CmdLine.tests.cpp" >
+          <Original>
+            !(result)
+          </Original>
+          <Expanded>
+            !{?}
+          </Expanded>
+        </Expression>
+        <Expression success="true" type="REQUIRE_THAT" filename="tests/<exe-name>/IntrospectiveTests/CmdLine.tests.cpp" >
+          <Original>
+            result.errorMessage(), ContainsSubstring("Could not parse 'abc' as benchmark samples")
+          </Original>
+          <Expanded>
+            "Could not parse 'abc' as benchmark samples" contains: "Could not parse 'abc' as benchmark samples"
+          </Expanded>
+        </Expression>
+        <OverallResults successes="2" failures="0" expectedFailures="0" skipped="false"/>
+      </Section>
+      <OverallResults successes="2" failures="0" expectedFailures="0" skipped="false"/>
+    </Section>
     <Section name="Benchmark options" filename="tests/<exe-name>/IntrospectiveTests/CmdLine.tests.cpp" >
       <Section name="resamples" filename="tests/<exe-name>/IntrospectiveTests/CmdLine.tests.cpp" >
         <Expression success="true" type="CHECK" filename="tests/<exe-name>/IntrospectiveTests/CmdLine.tests.cpp" >
@@ -22348,6 +22392,6 @@ Approx( -1.95996398454005449 )
     </Section>
     <OverallResult success="true" skips="0"/>
   </TestCase>
-  <OverallResults successes="2106" failures="157" expectedFailures="42" skips="12"/>
+  <OverallResults successes="2110" failures="157" expectedFailures="42" skips="12"/>
   <OverallResultsCases successes="317" failures="95" expectedFailures="18" skips="6"/>
 </Catch2TestRun>

tests/SelfTest/IntrospectiveTests/CmdLine.tests.cpp

@@ -301,6 +301,23 @@ TEST_CASE( "Process can be configured on command line", "[config][command-line]"
 
             REQUIRE(config.benchmarkSamples == 200);
         }
+        SECTION("samples must be greater than zero"){
+            auto result = cli.parse({"test", "--benchmark-samples=0"});
+
+            CHECK_FALSE(result);
+            REQUIRE_THAT(
+                result.errorMessage(),
+                ContainsSubstring("Benchmark samples must be greater than 0"));
+        }
+
+        SECTION("samples must be parseable") {
+            auto result = cli.parse({"test", "--benchmark-samples=abc"});
+
+            CHECK_FALSE(result);
+            REQUIRE_THAT(
+                result.errorMessage(),
+                ContainsSubstring("Could not parse 'abc' as benchmark samples"));
+        }
 
         SECTION("resamples") {
             CHECK(cli.parse({ "test", "--benchmark-resamples=20000" }));