Add env test

src/test/java/com/imgfloat/app/ChannelApiIntegrationTest.java

@@ -19,7 +19,10 @@ import static org.springframework.test.web.servlet.request.MockMvcRequestBuilder
 import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.jsonPath;
 import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
 
-@SpringBootTest
+@SpringBootTest(properties = {
+        "spring.security.oauth2.client.registration.twitch.client-id=test-client-id",
+        "spring.security.oauth2.client.registration.twitch.client-secret=test-client-secret"
+})
 @AutoConfigureMockMvc
 class ChannelApiIntegrationTest {
 

src/test/java/com/imgfloat/app/TwitchEnvironmentValidationTest.java

@@ -0,0 +1,40 @@
+package com.imgfloat.app;
+
+import com.imgfloat.app.config.TwitchCredentialsValidator;
+import org.junit.jupiter.api.Test;
+import org.springframework.boot.builder.SpringApplicationBuilder;
+import org.springframework.context.ConfigurableApplicationContext;
+
+import static org.assertj.core.api.Assertions.assertThatCode;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
+
+class TwitchEnvironmentValidationTest {
+
+    @Test
+    void failsToStartWhenTwitchCredentialsMissing() {
+        assertThatThrownBy(() -> new SpringApplicationBuilder(ImgfloatApplication.class)
+                .properties("server.port=0")
+                .run())
+                .hasRootCauseInstanceOf(IllegalArgumentException.class)
+                .hasRootCauseMessage("Could not resolve placeholder 'TWITCH_CLIENT_ID' in value \"${TWITCH_CLIENT_ID}\"");
+    }
+
+    @Test
+    void loadsCredentialsFromDotEnvFile() {
+        ConfigurableApplicationContext context = null;
+        try {
+            context = new SpringApplicationBuilder(ImgfloatApplication.class)
+                    .properties(
+                            "server.port=0",
+                            "spring.config.import=optional:file:src/test/resources/valid.env[.properties]")
+                    .run();
+            ConfigurableApplicationContext finalContext = context;
+            assertThatCode(() -> finalContext.getBean(TwitchCredentialsValidator.class))
+                    .doesNotThrowAnyException();
+        } finally {
+            if (context != null) {
+                context.close();
+            }
+        }
+    }
+}

src/test/resources/valid.env

@@ -0,0 +1,2 @@
+TWITCH_CLIENT_ID=test-client-id
+TWITCH_CLIENT_SECRET=test-client-secret