track total test duration

src/test/java/SolutionTest.java

@@ -1,54 +1,70 @@
 import java.io.*;
 
+import org.junit.jupiter.api.AfterAll;
+import org.junit.jupiter.api.BeforeAll;
 import org.junit.jupiter.params.ParameterizedTest;
 import org.junit.jupiter.params.provider.CsvFileSource;
 
+import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.junit.jupiter.api.Assertions.*;
 
 class SolutionTest {
 	
+	static long totalDuration;
+	
+	@BeforeAll
+	static void beforeAll() {
+		totalDuration = 0;
+	}
+	
+	@AfterAll
+	static void afterAll() {
+		System.out.println( String.format( "All solutions took %01d.%03d secs",  totalDuration / 1000,  totalDuration % 1000 ));
+	}
+	
 	@ParameterizedTest
 	@CsvFileSource( resources = "testdata.csv" )
 	void main( final String input, final String expected ) throws IOException {
+		// keep original streams
 		InputStream oldIn = System.in;
 		PrintStream oldOut = System.out;
 		PrintStream oldErr = System.err;
+		ByteArrayOutputStream bos =  new ByteArrayOutputStream();
 		
 		try {
-			InputStream in = new ByteArrayInputStream( input.getBytes() );
-			System.setIn( in );
-			
-			ByteArrayOutputStream out = new ByteArrayOutputStream();
-			System.setOut( new PrintStream( out ) );
-			
-			ByteArrayOutputStream err = new ByteArrayOutputStream();
-			System.setErr( new PrintStream( err ) );
+			redirectStreams(
+					new ByteArrayInputStream( input.getBytes( UTF_8 )),
+					new PrintStream( bos, true, UTF_8 ),
+					new PrintStream( new ByteArrayOutputStream(), true, UTF_8 )
+			);
 			
 			// start time tracking
 			long start = System.currentTimeMillis();
 			
 			Solution.main( new String[0] );
-			out.flush();
 			
 			// stop time tracking
-			long end = System.currentTimeMillis();
+			long duration = System.currentTimeMillis() - start;
+			totalDuration += duration;
 			
 			// restore streams
-			System.setIn( oldIn );
-			System.setOut( oldOut );
-			System.setErr( oldErr );
+			redirectStreams( oldIn, oldOut, oldErr );
 			
-			System.out.println( String.format( "Solution took %01d.%03d secs", ( end - start ) / 1000, ( end - start ) % 1000 ) );
+			System.out.println( String.format( "Solution took %01d.%03d secs",  duration / 1000,  duration % 1000 ));
 			
-			try (BufferedReader chk = new BufferedReader( new InputStreamReader( new ByteArrayInputStream( out.toByteArray() )))) {
+			try (BufferedReader chk = new BufferedReader( new InputStreamReader( new ByteArrayInputStream( bos.toByteArray() )))) {
 				assertEquals( expected, chk.readLine() );
 			}
 		}
 		finally {
 			// restore streams
-			System.setIn( oldIn );
-			System.setOut( oldOut );
-			System.setErr( oldErr );
+			redirectStreams( oldIn, oldOut, oldErr );
 		}
 	}
+	
+	static void redirectStreams( final InputStream input, final PrintStream output, final PrintStream error ) {
+		System.setIn( input );
+		System.setOut( output );
+		System.setErr( error );
+	}
 }