From e045189ab71eca49f85a77cf43626a7cec00d59b Mon Sep 17 00:00:00 2001
From: bahti <b_kaba@hotmail.com>
Date: Sun, 8 Apr 2018 13:03:40 +0300
Subject: [PATCH] asserting exceptions in junit4 and junit5 code sample added

---
 .../exception/ExceptionAssertionTest.java     | 23 ++++++++++++++++++
 .../junit4/ExceptionAssertionTest.java        | 24 +++++++++++++++++++
 2 files changed, 47 insertions(+)
 create mode 100644 testing-modules/junit-5/src/test/java/com/baeldung/exception/ExceptionAssertionTest.java
 create mode 100644 testing-modules/junit-5/src/test/java/com/baeldung/migration/junit4/ExceptionAssertionTest.java

diff --git a/testing-modules/junit-5/src/test/java/com/baeldung/exception/ExceptionAssertionTest.java b/testing-modules/junit-5/src/test/java/com/baeldung/exception/ExceptionAssertionTest.java
new file mode 100644
index 000000000000..f97e2ba9c71f
--- /dev/null
+++ b/testing-modules/junit-5/src/test/java/com/baeldung/exception/ExceptionAssertionTest.java
@@ -0,0 +1,23 @@
+package com.baeldung.exception;
+
+import static org.junit.jupiter.api.Assertions.assertThrows;
+
+import org.junit.jupiter.api.Test;
+
+public class ExceptionAssertionTest {
+    @Test
+    public void whenExceptionThrown_thenAssertionSucceeds() {
+        String test = null;
+        assertThrows(NullPointerException.class, () -> {
+            test.length();
+        });
+    }
+
+    @Test
+    public void whenDerivedExceptionThrown_thenAssertionSucceds() {
+        String test = null;
+        assertThrows(RuntimeException.class, () -> {
+            test.length();
+        });
+    }
+}
\ No newline at end of file
diff --git a/testing-modules/junit-5/src/test/java/com/baeldung/migration/junit4/ExceptionAssertionTest.java b/testing-modules/junit-5/src/test/java/com/baeldung/migration/junit4/ExceptionAssertionTest.java
new file mode 100644
index 000000000000..6cd2559f5746
--- /dev/null
+++ b/testing-modules/junit-5/src/test/java/com/baeldung/migration/junit4/ExceptionAssertionTest.java
@@ -0,0 +1,24 @@
+package com.baeldung.migration.junit4;
+
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.ExpectedException;
+
+public class ExceptionAssertionTest {
+
+    @Rule
+    public ExpectedException exceptionRule = ExpectedException.none();
+
+    @Test(expected = NullPointerException.class)
+    public void whenExceptionThrown_thenExpectationSatisfied() {
+        String test = null;
+        test.length();
+    }
+
+    @Test
+    public void whenExceptionThrown_thenRuleIsApplied() {
+        exceptionRule.expect(NumberFormatException.class);
+        exceptionRule.expectMessage("For input string");
+        Integer.parseInt("1a");
+    }
+}