Add test for the main method

javadev · web-flow · commit 16b5dd8e99b5 · 2025-06-14T19:32:20.000+03:00
diff --git a/src/main/java/java_stream_api/App.java b/src/main/java/java_stream_api/App.java
@@ -180,9 +180,7 @@ public static List<User> convertBirthdatesToString(List<User> users) {
 
     // 30. Filter a list of Person objects, keeping only those who live in "City X".
     public static List<Person> filterPersonsByCity(List<Person> persons, String city) {
-        return persons.stream()
-                .filter(p -> city.equals(p.getCity()))
-                .collect(Collectors.toList());
+        return persons.stream().filter(p -> city.equals(p.getCity())).collect(Collectors.toList());
     }
 
     // 31. Reverse the order of elements in a list.
diff --git a/src/test/java/java_stream_api/AppTest.java b/src/test/java/java_stream_api/AppTest.java
@@ -448,4 +448,10 @@ void testUserNamesSortedByLength() {
         List<String> result = App.userNamesSortedByLength(Arrays.asList(u1, u2, u3));
         assertEquals(Arrays.asList("Eve", "Abi", "Angelina"), result, "Sort by length ascending");
     }
+
+    @Test
+    @DisplayName("Main method runs without throwing exceptions")
+    void testMainRunsWithoutException() {
+        assertDoesNotThrow(() -> App.main(new String[] {}));
+    }
 }

Original file line number	Diff line number	Diff line change
`@@ -180,9 +180,7 @@ public static List<User> convertBirthdatesToString(List<User> users) {`
`180`	`180`
`181`	`181`	`// 30. Filter a list of Person objects, keeping only those who live in "City X".`
`182`	`182`	`public static List<Person> filterPersonsByCity(List<Person> persons, String city) {`
`183`		`- return persons.stream()`
`184`		`- .filter(p -> city.equals(p.getCity()))`
`185`		`- .collect(Collectors.toList());`
	`183`	`+ return persons.stream().filter(p -> city.equals(p.getCity())).collect(Collectors.toList());`
`186`	`184`	`}`
`187`	`185`
`188`	`186`	`// 31. Reverse the order of elements in a list.`
Original file line number	Diff line number	Diff line change
`@@ -448,4 +448,10 @@ void testUserNamesSortedByLength() {`
`448`	`448`	`List<String> result = App.userNamesSortedByLength(Arrays.asList(u1, u2, u3));`
`449`	`449`	`assertEquals(Arrays.asList("Eve", "Abi", "Angelina"), result, "Sort by length ascending");`
`450`	`450`	`}`
	`451`	`+`
	`452`	`+ @Test`
	`453`	`+ @DisplayName("Main method runs without throwing exceptions")`
	`454`	`+ void testMainRunsWithoutException() {`
	`455`	`+ assertDoesNotThrow(() -> App.main(new String[] {}));`
	`456`	`+ }`
`451`	`457`	`}`