diff --git a/src/test/java/hse/java/restcountries/RestCountriesApiTest.java b/src/test/java/hse/java/restcountries/RestCountriesApiTest.java
new file mode 100644
index 0000000..3ca7f08
--- /dev/null
+++ b/src/test/java/hse/java/restcountries/RestCountriesApiTest.java
@@ -0,0 +1,119 @@
+package hse.java.restcountries;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+
+import java.net.URI;
+import java.net.http.HttpClient;
+import java.net.http.HttpRequest;
+import java.net.http.HttpResponse;
+import java.time.Duration;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+class RestCountriesApiTest {
+
+    private static final String BASE_URL = "https://restcountries.com/v3.1";
+    private static final HttpClient CLIENT = HttpClient.newBuilder()
+            .connectTimeout(Duration.ofSeconds(10))
+            .build();
+    private static final ObjectMapper MAPPER = new ObjectMapper();
+
+    private HttpResponse<String> get(String path) throws Exception {
+        HttpRequest request = HttpRequest.newBuilder()
+                .uri(URI.create(BASE_URL + path))
+                .timeout(Duration.ofSeconds(20))
+                .header("Accept", "application/json")
+                .GET()
+                .build();
+        return CLIENT.send(request, HttpResponse.BodyHandlers.ofString());
+    }
+
+    private JsonNode getArray(String path) throws Exception {
+        HttpResponse<String> response = get(path);
+        assertEquals(200, response.statusCode());
+        JsonNode root = MAPPER.readTree(response.body());
+        assertTrue(root.isArray());
+        return root;
+    }
+
+    private boolean containsCommonName(JsonNode countries, String expectedName) {
+        for (JsonNode country : countries) {
+            if (expectedName.equals(country.path("name").path("common").asText())) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    private boolean containsCapital(JsonNode countries, String expectedCapital) {
+        for (JsonNode country : countries) {
+            JsonNode capital = country.path("capital");
+            if (capital.isArray()) {
+                for (JsonNode item : capital) {
+                    if (expectedCapital.equals(item.asText())) {
+                        return true;
+                    }
+                }
+            } else if (expectedCapital.equals(capital.asText())) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    @Test
+    @DisplayName("GET /all возвращает непустой список стран")
+    void allReturnsNonEmptyList() throws Exception {
+        JsonNode countries = getArray("/all");
+        assertTrue(countries.size() > 0);
+    }
+
+    @Test
+    @DisplayName("GET /name/russia возвращает страну со столицей Moscow")
+    void russiaHasMoscowCapital() throws Exception {
+        JsonNode countries = getArray("/name/russia");
+        assertTrue(containsCapital(countries, "Moscow"));
+    }
+
+    @Test
+    @DisplayName("GET /alpha/de возвращает страну Germany")
+    void alphaDeReturnsGermany() throws Exception {
+        JsonNode countries = getArray("/alpha/de");
+        assertTrue(containsCommonName(countries, "Germany"));
+    }
+
+    @Test
+    @DisplayName("GET /name/nonexistentcountryxyz возвращает 404")
+    void nonexistentCountryReturns404() throws Exception {
+        HttpResponse<String> response = get("/name/nonexistentcountryxyz");
+        assertEquals(404, response.statusCode());
+    }
+
+    @Test
+    @DisplayName("GET /all возвращает страны с population больше нуля")
+    void allCountriesHavePositivePopulation() throws Exception {
+        JsonNode countries = getArray("/all");
+        for (JsonNode country : countries) {
+            assertTrue(country.path("population").asLong(0) > 0);
+        }
+    }
+
+    @Test
+    @DisplayName("GET /name/canada возвращает страну Canada")
+    void nameCanadaReturnsCanada() throws Exception {
+        JsonNode countries = getArray("/name/canada");
+        assertTrue(containsCommonName(countries, "Canada"));
+    }
+
+    @Test
+    @DisplayName("GET /alpha/jp возвращает страну Japan")
+    void alphaJpReturnsJapan() throws Exception {
+        JsonNode countries = getArray("/alpha/jp");
+        assertTrue(containsCommonName(countries, "Japan"));
+    }
+}
+