Add json validation tests

This commit adds JSON structure validation tests to ensure that the
output is backward compatible with older versions if we enhance it
in the future.

Partly fixes gh-21

initializr/pom.xml

@@ -56,6 +56,11 @@
 			<artifactId>xmlunit</artifactId>
 			<scope>test</scope>
 		</dependency>
+		<dependency>
+			<groupId>org.skyscreamer</groupId>
+			<artifactId>jsonassert</artifactId>
+			<scope>test</scope>
+		</dependency>
 	</dependencies>
 
 
@@ -73,6 +78,11 @@
 				<artifactId>xmlunit</artifactId>
 				<version>1.5</version>
 			</dependency>
+			<dependency>
+				<groupId>org.skyscreamer</groupId>
+				<artifactId>jsonassert</artifactId>
+				<version>1.2.3</version>
+			</dependency>
 		</dependencies>
 	</dependencyManagement>
 

initializr/src/test/groovy/io/spring/initializr/web/MainControllerIntegrationTests.groovy

@@ -16,12 +16,19 @@
 
 package io.spring.initializr.web
 
-import io.spring.initializr.support.ProjectAssert
-import org.junit.Test
+import java.nio.charset.Charset
 
+import io.spring.initializr.support.ProjectAssert
+import org.json.JSONObject
+import org.junit.Test
+import org.skyscreamer.jsonassert.JSONAssert
+import org.skyscreamer.jsonassert.JSONCompareMode
+
+import org.springframework.core.io.ClassPathResource
 import org.springframework.http.HttpStatus
 import org.springframework.http.ResponseEntity
 import org.springframework.test.context.ActiveProfiles
+import org.springframework.util.StreamUtils
 
 import static org.junit.Assert.*
 
@@ -55,6 +62,20 @@ class MainControllerIntegrationTests extends AbstractMainControllerIntegrationTe
 				.isGradleProject()
 	}
 
+	@Test // Test that the current output is exactly what we expect
+	void validateCurrentProjectMetadata() {
+		String json = restTemplate.getForObject(createUrl('/'), String.class)
+		JSONObject expected = readJson('1.0')
+		JSONAssert.assertEquals(expected, new JSONObject(json), JSONCompareMode.STRICT)
+	}
+
+	@Test // Test that the  current code complies "at least" with 1.0
+	void validateProjectMetadata10() {
+		String json = restTemplate.getForObject(createUrl('/'), String.class)
+		JSONObject expected = readJson('1.0')
+		JSONAssert.assertEquals(expected, new JSONObject(json), JSONCompareMode.LENIENT)
+	}
+
 	// Existing tests for backward compatibility
 
 	@Test
@@ -147,4 +168,16 @@ class MainControllerIntegrationTests extends AbstractMainControllerIntegrationTe
 		archiveFile
 	}
 
+
+	private static JSONObject readJson(String version) {
+		def resource = new ClassPathResource('metadata/test-default-' + version + '.json')
+		def stream = resource.getInputStream()
+		try {
+			String json = StreamUtils.copyToString(stream, Charset.forName('UTF-8'))
+			new JSONObject(json)
+		} finally {
+			stream.close()
+		}
+	}
+
 }

initializr/src/test/resources/metadata/test-default-1.0.json

@@ -0,0 +1,119 @@
+{"dependencies": [
+    {
+        "name": "Core",
+        "content": [
+            {
+                "name": "Web",
+                "id": "web"
+            },
+            {
+                "name": "Security",
+                "id": "security"
+            },
+            {
+                "name": "Data JPA",
+                "id": "data-jpa"
+            }
+        ]
+    },
+    {
+        "name": "Other",
+        "content": [
+            {
+                "name": "Foo",
+                "id": "org.acme:foo"
+            },
+            {
+                "name": "Bar",
+                "id": "org.acme:bar"
+            }
+        ]
+    }
+], "types": [
+    {
+        "name": "Maven POM",
+        "id": "pom.xml",
+        "action": "/pom.xml",
+        "default": false
+    },
+    {
+        "name": "Maven Project",
+        "id": "starter.zip",
+        "action": "/starter.zip",
+        "default": true
+    },
+    {
+        "name": "Gradle Config",
+        "id": "build.gradle",
+        "action": "/build.gradle",
+        "default": false
+    },
+    {
+        "name": "Gradle Project",
+        "id": "gradle.zip",
+        "action": "/starter.zip",
+        "default": false
+    }
+], "packagings": [
+    {
+        "name": "Jar",
+        "id": "jar",
+        "default": true
+    },
+    {
+        "name": "War",
+        "id": "war",
+        "default": false
+    }
+], "javaVersions": [
+    {
+        "name": "1.6",
+        "id": "1.6",
+        "default": false
+    },
+    {
+        "name": "1.7",
+        "id": "1.7",
+        "default": true
+    },
+    {
+        "name": "1.8",
+        "id": "1.8",
+        "default": false
+    }
+], "languages": [
+    {
+        "name": "Groovy",
+        "id": "groovy",
+        "default": false
+    },
+    {
+        "name": "Java",
+        "id": "java",
+        "default": true
+    }
+], "bootVersions": [
+    {
+        "name": "Latest SNAPSHOT",
+        "id": "1.2.0.BUILD-SNAPSHOT",
+        "default": false
+    },
+    {
+        "name": "1.1.5",
+        "id": "1.1.5.RELEASE",
+        "default": true
+    },
+    {
+        "name": "1.0.2",
+        "id": "1.0.2.RELEASE",
+        "default": false
+    }
+], "defaults": {
+    "groupId": "org.test",
+    "artifactId": "demo",
+    "version": "0.0.1-SNAPSHOT",
+    "name": "demo",
+    "description": "Demo project for Spring Boot",
+    "packageName": "demo"
+}
+}