changement hamcrest -> assertJ pour les tests

build.gradle

@@ -13,9 +13,9 @@ repositories {
 }
 
 dependencies {
-    testImplementation('org.junit.jupiter:junit-jupiter-api:5.7.2',
-            'org.hamcrest:hamcrest-library:2.2', 'net.obvj:junit-utils:1.3.1')
-    testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.7.2'
+    testImplementation('org.junit.jupiter:junit-jupiter-api:5.8.1',
+            'org.assertj:assertj-core:3.21.0')
+    testRuntimeOnly('org.junit.jupiter:junit-jupiter-engine:5.8.1')
 }
 
 test {

src/test/java/ByteGrayColorTest.java

 import org.junit.jupiter.api.Test;
 
-import static org.hamcrest.MatcherAssert.assertThat;
-import static org.hamcrest.Matchers.*;
+import static org.assertj.core.api.Assertions.*;
 
 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)));
+    assertThat(black.getLuminosity()).isCloseTo(0., within(.01));
+    assertThat(white.getLuminosity()).isCloseTo(1., within(.01));
   }
 
   @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)));
+    assertThat(color1.getLuminosity()).isCloseTo(.25, within(.01));
+    assertThat(color2.getLuminosity()).isCloseTo(.75, within(.01));
   }
 }
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src/test/java/MatrixGrayImageTest.java

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