Ajout tests

src/test/java/ByteGrayColorTest.java

+import org.junit.jupiter.api.Test;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.*;
+
+public class ByteGrayColorTest {
+  @Test
+  public void testGetLuminosity_whenColorCreatedWithGrayLevel(){
+    ByteGrayColor black = new ByteGrayColor(0);
+    ByteGrayColor white = new ByteGrayColor(255);
+    assertThat(black.getLuminosity(), is(closeTo(0.,.0001)));
+    assertThat(white.getLuminosity(), is(closeTo(1.,.0001)));
+  }
+
+  @Test
+  public void testGetLuminosity_whenColorCreatedWithLuminosity(){
+    ByteGrayColor color1 = new ByteGrayColor(.25);
+    ByteGrayColor color2 = new ByteGrayColor(.75);
+    assertThat(color1.getLuminosity(), is(closeTo(.25,.0001)));
+    assertThat(color2.getLuminosity(), is(closeTo(.75,.0001)));
+  }
+}

src/test/java/MatrixGrayImageTest.java

 import org.junit.jupiter.api.Test;
 
-import static org.junit.jupiter.api.Assertions.*;
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.*;
+
 
 class MatrixGrayImageTest {
 
     @Test
     void getWidth() {
-        assertEquals(0, new MatrixGrayImage(0,0).getWidth());
-        assertEquals(10, new MatrixGrayImage(10,20).getWidth());
-        assertEquals(400, new MatrixGrayImage(400,300).getWidth());
+        assertThat(new MatrixGrayImage(0,0).getWidth(), is(equalTo(0)));
+        assertThat(new MatrixGrayImage(10,20).getWidth(), is(equalTo(10)));
+        assertThat(new MatrixGrayImage(400,300).getWidth(), is(equalTo(400)));
     }
 
     @Test
     void getHeight() {
-        assertEquals(0, new MatrixGrayImage(0,0).getHeight());
-        assertEquals(20, new MatrixGrayImage(10,20).getHeight());
-        assertEquals(300, new MatrixGrayImage(400,300).getHeight());
+        assertThat(new MatrixGrayImage(0,0).getWidth(), is(equalTo(0)));
+        assertThat(new MatrixGrayImage(10,20).getWidth(), is(equalTo(20)));
+        assertThat(new MatrixGrayImage(400,300).getWidth(), is(equalTo(300)));
     }
 }
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