fixed issue causing C# tests to fail

Author: toptobes

src/main/java/com/dtsx/docs/core/runner/drivers/impls/CSharpDriver.java

@@ -18,7 +18,6 @@
 import java.util.List;
 import java.util.Map;
 import java.util.function.Function;
-import java.util.regex.Pattern;
 
 public class CSharpDriver extends ClientDriver {
     public CSharpDriver(String artifact) {
@@ -51,9 +50,28 @@ public Path setupExecutionEnvironment(BaseScriptRunnerCtx ctx, ExecutionEnvironm
 
     @Override
     public String preprocessScript(BaseScriptRunnerCtx ignoredCtx, String content, @TestFileModifierFlags int mods) {
-        return Pattern.compile("^public\\s+class\\s+\\w+", Pattern.MULTILINE)
-            .matcher(content)
-            .replaceFirst("public class Example");
+        val mainIndex = content.indexOf("Main(");
+
+        if (mainIndex == -1) {
+            throw new RunException("Main method not found in C# script");
+        }
+
+        val classIndex = content.lastIndexOf("\npublic class ", mainIndex);
+
+        if (classIndex == -1) {
+            throw new RunException("Public class declaration not found before Main method in C# script");
+        }
+
+        val nameStart = classIndex + "\npublic class ".length();
+        var nameEnd = nameStart;
+
+        while (nameEnd < content.length() && Character.isLetterOrDigit(content.charAt(nameEnd))) {
+            nameEnd++;
+        }
+
+        return content.substring(0, nameStart)
+            + "Example"
+            + content.substring(nameEnd);
     }
 
     @Override

src/main/java/com/dtsx/docs/core/runner/tests/strategies/test/CompilesTestStrategy.java

@@ -78,16 +78,19 @@ private void runSingleTest(TestRoot testRoot, Map<ClientLanguage, Map<Path, Test
             return;
         }
 
-        execEnv.withTestFileCopied(driver, path, mkPlaceholders(testRoot), TestFileModifiers.NONE, () -> {
-            val res = driver.compileScript(ctx, execEnv);
+        try {
+            val outcome = execEnv.withTestFileCopied(driver, path, mkPlaceholders(testRoot), TestFileModifiers.NONE, () -> {
+                val res = driver.compileScript(ctx, execEnv);
 
-            val outcome = (res.notOk())
-                ? new TestOutcome.FailedToCompile(res.output()).alsoLog(testRoot, lang, res.output())
-                : TestOutcome.Passed.INSTANCE;
+                return (res.notOk())
+                    ? new TestOutcome.FailedToCompile(res.output()).alsoLog(testRoot, lang, res.output())
+                    : TestOutcome.Passed.INSTANCE;
+            });
 
             outcomes.get(lang).put(path, outcome);
-            return null;
-        });
+        } catch (Exception e) {
+            outcomes.get(lang).put(path, new TestOutcome.Errored(e).alsoLog(testRoot, lang));
+        }
     }
 
     private Placeholders mkPlaceholders(TestRoot testRoot) {