[MGPG-107] Settle on JUnit 5 (#70)

No need for another library just to perform 4 assertions.

---

https://issues.apache.org/jira/browse/MGPG-107

pgp-keys-map.list

@@ -19,14 +19,9 @@ commons-io:commons-io = 0x2DB4F1EF0FA761ECC4EA935C86FDC7E2A11262CB
 javax.inject:javax.inject = noSig
 org.apiguardian:apiguardian-api = 0xFF6E2C001948C5F2F38B0CC385911F425EC61B51
 org.junit.jupiter:junit-jupiter-api = 0xFF6E2C001948C5F2F38B0CC385911F425EC61B51
-org.junit.jupiter:junit-jupiter-engine = 0xFF6E2C001948C5F2F38B0CC385911F425EC61B51
 org.junit.jupiter:junit-jupiter-params = 0xFF6E2C001948C5F2F38B0CC385911F425EC61B51
-org.junit.jupiter:junit-jupiter = 0xFF6E2C001948C5F2F38B0CC385911F425EC61B51
 org.junit.platform:junit-platform-commons = 0xFF6E2C001948C5F2F38B0CC385911F425EC61B51
-org.junit.platform:junit-platform-engine = 0xFF6E2C001948C5F2F38B0CC385911F425EC61B51
 org.opentest4j:opentest4j = 0xFF6E2C001948C5F2F38B0CC385911F425EC61B51
-net.bytebuddy:byte-buddy = 0xB4AC8CDC141AF0AE468D16921DA784CCB5C46DD5
-org.assertj:assertj-core = 0xBE685132AFD2740D9095F9040CC0B712FEE75827
 org.apache.maven.resolver = 0x522CA055B326A636D833EF6A0551FD3684FCBBB7
 org.apache.maven.shared:maven-invoker = 0x84789D24DF77A32433CE1F079EB80E92EB2135B1
 org.codehaus.plexus:plexus-cipher = 0x6A814B1F869C2BBEAB7CB7271A2A1C94BDE89688

pom.xml

@@ -126,15 +126,9 @@ under the License.
       <version>2.0</version>
     </dependency>
 
-    <dependency>
-      <groupId>org.assertj</groupId>
-      <artifactId>assertj-core</artifactId>
-      <version>3.25.2</version>
-      <scope>test</scope>
-    </dependency>
     <dependency>
       <groupId>org.junit.jupiter</groupId>
-      <artifactId>junit-jupiter</artifactId>
+      <artifactId>junit-jupiter-api</artifactId>
       <scope>test</scope>
     </dependency>
     <dependency>

src/test/java/org/apache/maven/plugins/gpg/it/GpgSignArtifactIT.java

@@ -26,7 +26,9 @@
 import org.junit.jupiter.params.ParameterizedTest;
 import org.junit.jupiter.params.provider.MethodSource;
 
-import static org.assertj.core.api.Assertions.assertThat;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertTrue;
 
 public class GpgSignArtifactIT {
     private final File mavenHome;
@@ -80,7 +82,13 @@ void testPlacementOfArtifactInOutputDirectory(String pomPath, String expectedFil
         InvokerTestUtils.executeRequest(request, mavenHome, localRepository);
 
         // then
-        assertThat(expectedOutputDirectory).exists();
-        assertThat(expectedOutputDirectory.list()).containsExactlyInAnyOrder(expectedFiles);
+        assertTrue(expectedOutputDirectory.isDirectory());
+
+        String[] outputFiles = expectedOutputDirectory.list();
+        assertNotNull(outputFiles);
+
+        Arrays.sort(outputFiles);
+        Arrays.sort(expectedFiles);
+        assertEquals(Arrays.toString(expectedFiles), Arrays.toString(outputFiles));
     }
 }

src/test/java/org/apache/maven/plugins/gpg/it/GpgSignAttachedMojoIT.java

@@ -25,7 +25,8 @@
 import org.codehaus.plexus.util.FileUtils;
 import org.junit.jupiter.api.Test;
 
-import static org.assertj.core.api.Assertions.assertThat;
+import static org.junit.jupiter.api.Assertions.assertNotEquals;
+import static org.junit.jupiter.api.Assertions.assertTrue;
 
 public class GpgSignAttachedMojoIT {
 
@@ -58,11 +59,9 @@ void testInteractiveWithoutPassphrase() throws Exception {
         final String buildLogContent = FileUtils.fileRead(result.getBuildLog());
 
         // then
-        assertThat(invocationResult.getExitCode())
-                .as("Maven execution must fail")
-                .isNotEqualTo(0);
-        assertThat(buildLogContent)
-                .as("Maven execution failed because no pinentry program is available")
-                .contains("[GNUPG:] FAILURE sign 67108949");
+        assertNotEquals(0, invocationResult.getExitCode(), "Maven execution must fail");
+        assertTrue(
+                buildLogContent.contains("[GNUPG:] FAILURE sign 67108949"),
+                "Maven execution failed because no pinentry program is available");
     }
 }