added README and testdata

README.md

@@ -0,0 +1,37 @@
+# Sudoku verifier
+
+## Definition
+Sudokus are logic number puzzles in which cells in a 9×9 grid must be populated with 
+the digits 1 to 9 in a way that each digit occurrs only once in each unit (that is column, 
+row or block = 3×3 sub grid).
+
+![a solved simple sudoku](sudoku.gif)
+
+## Goal
+Validate if a given solution for a Sudoku is valid, by checking that the digit
+1 to 9 appear only once in column, in each row and in each of the 9 sub grids.
+
+### Input
+a sequence of 81 digits, organized in 9 columns and 9 rows
+
+### Output
+A boolean value, if the grid is valid.
+
+### Constraints
+1 <= `digit` <= 9
+
+### Examples
+**Input:** 
+```
+9 8 1 5 2 3 6 4 7
+6 3 4 8 7 9 2 5 1
+2 7 5 1 4 6 9 8 3
+1 9 6 4 8 7 5 3 2
+5 4 8 3 1 2 7 6 9
+7 2 3 6 9 5 4 1 8
+3 1 2 7 5 4 8 9 6
+4 6 9 2 3 8 1 7 5
+8 5 7 9 6 1 3 2 4
+```
+**Output:** 
+`true`

settings.gradle

@@ -1 +1 @@
-rootProject.name = 'template'
+rootProject.name = 'sudoku-verifier'

src/test/java/SolutionTest.java

@@ -1,8 +1,10 @@
 import java.io.*;
+import java.util.stream.Collectors;
 
 import org.junit.jupiter.api.AfterAll;
 import org.junit.jupiter.api.BeforeAll;
 import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.converter.*;
 import org.junit.jupiter.params.provider.CsvFileSource;
 
 import static java.nio.charset.StandardCharsets.UTF_8;
@@ -10,6 +12,15 @@ import static org.junit.jupiter.api.Assertions.*;
 
 class SolutionTest {
 	
+	static class SudokuConverter extends SimpleArgumentConverter {
+		@Override
+		protected Object convert( Object source, Class<?> targetType ) throws ArgumentConversionException {
+			assertEquals(String.class, targetType, "Can only convert to String");
+			BufferedReader in = new BufferedReader( new InputStreamReader( SolutionTest.class.getResourceAsStream( String.valueOf( source ))));
+			return in.lines().collect( Collectors.joining( System.lineSeparator() ));
+		}
+	}
+	
 	static long totalDuration;
 	
 	@BeforeAll
@@ -24,7 +35,7 @@ class SolutionTest {
 	
 	@ParameterizedTest
 	@CsvFileSource( resources = "testdata.csv" )
-	void main( final String input, final String expected ) throws IOException {
+	void main( @ConvertWith( SudokuConverter.class ) final String input, final String expected ) throws IOException {
 		// keep original streams
 		InputStream oldIn = System.in;
 		PrintStream oldOut = System.out;

src/test/resources/sudoku1.txt

@@ -0,0 +1,9 @@
+9 8 1 5 2 3 6 4 7
+6 3 4 8 7 9 2 5 1
+2 7 5 1 4 6 9 8 3
+1 9 6 4 8 7 5 3 2
+5 4 8 3 1 2 7 6 9
+7 2 3 6 9 5 4 1 8
+3 1 2 7 5 4 8 9 6
+4 6 9 2 3 8 1 7 5
+8 5 7 9 6 1 3 2 4

src/test/resources/sudoku2.txt

@@ -0,0 +1,9 @@
+2 4 6 8 9 3 7 5 1
+5 9 8 6 7 1 4 2 3
+1 7 3 5 2 4 6 9 8
+7 5 1 2 3 6 8 4 9
+9 8 2 1 4 5 3 7 6
+6 3 4 7 8 9 5 1 2
+4 1 9 3 5 8 2 6 7
+8 2 5 9 6 7 1 3 4
+3 6 7 4 1 2 9 8 5

src/test/resources/sudoku3.txt

@@ -0,0 +1,9 @@
+8 4 2 9 6 7 5 3 1
+7 9 3 5 1 8 4 6 2
+6 1 5 2 4 3 8 7 9
+2 7 9 8 7 6 3 1 4
+1 6 7 4 3 2 9 5 8
+4 3 8 1 9 5 6 2 7
+9 2 6 3 8 1 7 4 5
+3 8 1 7 5 4 2 9 6
+5 7 4 6 2 9 1 8 3

src/test/resources/sudoku4.txt

@@ -0,0 +1,9 @@
+8 9 4 7 1 3 5 2 6
+7 1 2 6 5 8 4 3 9
+6 3 5 4 9 2 1 8 7
+2 4 1 5 3 6 7 9 8
+9 8 6 1 2 7 3 5 4
+3 5 7 9 8 4 2 6 1
+1 6 9 3 4 5 8 7 2
+4 2 3 8 7 9 6 1 5
+5 7 8 2 6 1 9 4 3

src/test/resources/sudoku5.txt

@@ -0,0 +1,9 @@
+3 2 7 6 9 5 1 8 4
+8 1 5 4 7 3 6 2 9
+9 4 6 1 2 8 7 5 3
+6 5 1 8 4 2 3 9 7
+4 3 9 7 5 6 8 1 2
+2 7 8 3 1 9 5 6 4
+5 6 3 2 8 4 9 7 1
+7 8 4 9 3 1 2 6 5
+1 9 2 5 6 7 4 3 8

src/test/resources/testdata.csv

@@ -0,0 +1,5 @@
+sudoku1.txt, true
+sudoku2.txt, true
+sudoku3.txt, false
+sudoku4.txt, true
+sudoku5.txt, false