Dunaev_S_A: rest-countries-tests

src/test/java/hse/java/restcountries/RestCounties.java

@@ -0,0 +1,117 @@
+package hse.java.restcountries;
+
+import java.net.URI;
+import java.net.http.HttpClient;
+import java.net.http.HttpRequest;
+import java.net.http.HttpResponse;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.ObjectMapper;
+
+class RestCountries {
+
+    static final String BASE_URL = "https://restcountries.com/v3.1";
+    static HttpClient client;
+
+    @BeforeAll
+    static void setUp() {
+        client = HttpClient.newHttpClient();
+    }
+
+    // 1.
+    @Test
+    void getAllReturns200AndNotEmpty() throws Exception {
+        var request = HttpRequest.newBuilder()
+                .uri(URI.create(BASE_URL + "/all?fields=name"))
+                .build();
+        var response = client.send(request, HttpResponse.BodyHandlers.ofString());
+
+        assertEquals(200, response.statusCode());
+        assertFalse(response.body().isEmpty());
+    }
+
+    // 2
+    @Test
+    void russiaHasCapitalMoscow() throws Exception {
+        var request = HttpRequest.newBuilder()
+                .uri(URI.create(BASE_URL + "/name/russia"))
+                .build();
+        var response = client.send(request, HttpResponse.BodyHandlers.ofString());
+
+        assertEquals(200, response.statusCode());
+        assertTrue(response.body().contains("Moscow"));
+    }
+
+    // 3.
+    @Test
+    void alphaDeReturnsGermany() throws Exception {
+        var request = HttpRequest.newBuilder()
+                .uri(URI.create(BASE_URL + "/alpha/de"))
+                .build();
+        var response = client.send(request, HttpResponse.BodyHandlers.ofString());
+
+        assertEquals(200, response.statusCode());
+        assertTrue(response.body().contains("Germany"));
+    }
+
+    // 4.
+    @Test
+    void nonExistentCountryReturns404() throws Exception {
+        var request = HttpRequest.newBuilder()
+                .uri(URI.create(BASE_URL + "/name/nonexistentcountryxyz"))
+                .build();
+        var response = client.send(request, HttpResponse.BodyHandlers.ofString());
+
+        assertEquals(404, response.statusCode());
+    }
+
+    // 5
+    @Test
+    void allCountriesHaveValidPopulation() throws Exception {
+        var request = HttpRequest.newBuilder()
+                .uri(URI.create(BASE_URL + "/all?fields=name,population"))
+                .build();
+        var response = client.send(request, HttpResponse.BodyHandlers.ofString());
+
+        assertEquals(200, response.statusCode());
+
+        ObjectMapper mapper = new ObjectMapper();
+        JsonNode countries = mapper.readTree(response.body());
+
+        for (JsonNode country : countries) {
+            long population = country.path("population").asLong();
+            assertTrue(population >= 0, "Expect >= 0");
+        }
+    }
+
+    // 6.
+    @Test
+    void countriesWithUsdCurrencyNotEmpty() throws Exception {
+        var request = HttpRequest.newBuilder()
+                .uri(URI.create(BASE_URL + "/currency/usd"))
+                .build();
+        var response = client.send(request, HttpResponse.BodyHandlers.ofString());
+
+        assertEquals(200, response.statusCode());
+        assertFalse(response.body().isEmpty());
+    }
+
+    // 7.
+    @Test
+    void alphaFrReturnsFranceInEurope() throws Exception {
+        var request = HttpRequest.newBuilder()
+                .uri(URI.create(BASE_URL + "/alpha/fr"))
+                .build();
+        var response = client.send(request, HttpResponse.BodyHandlers.ofString());
+
+        assertEquals(200, response.statusCode());
+        assertTrue(response.body().contains("France"));
+        assertTrue(response.body().contains("Europe"));
+    }
+}