Don't throw checked exceptions from Assert classes

Fixes gh-5709

spring-boot-test/src/main/java/org/springframework/boot/test/json/BasicJsonTester.java

@@ -17,7 +17,6 @@
 package org.springframework.boot.test.json;
 
 import java.io.File;
-import java.io.IOException;
 import java.io.InputStream;
 
 import org.springframework.core.io.Resource;
@@ -63,9 +62,9 @@ public class BasicJsonTester {
 	 * using {@code resourceLoadClass}.
 	 * @param source JSON content or a {@code .json} resource name
 	 * @return the JSON content
-	 * @throws IOException on load error
+	 * @on load error
 	 */
-	public JsonContent<Object> from(CharSequence source) throws IOException {
+	public JsonContent<Object> from(CharSequence source) {
 		return getJsonContent(this.loader.getJson(source));
 	}
 
@@ -74,10 +73,9 @@ public class BasicJsonTester {
 	 * @param path the path of the resource to load
 	 * @param resourceLoadClass the classloader used load the resource
 	 * @return the JSON content
-	 * @throws IOException on load error
+	 * @on load error
 	 */
-	public JsonContent<Object> from(String path, Class<?> resourceLoadClass)
-			throws IOException {
+	public JsonContent<Object> from(String path, Class<?> resourceLoadClass) {
 		return getJsonContent(this.loader.getJson(path, resourceLoadClass));
 	}
 
@@ -85,9 +83,9 @@ public class BasicJsonTester {
 	 * Create JSON content from the specified JSON bytes.
 	 * @param source the bytes of JSON
 	 * @return the JSON content
-	 * @throws IOException on load error
+	 * @on load error
 	 */
-	public JsonContent<Object> from(byte[] source) throws IOException {
+	public JsonContent<Object> from(byte[] source) {
 		return getJsonContent(this.loader.getJson(source));
 	}
 
@@ -95,9 +93,9 @@ public class BasicJsonTester {
 	 * Create JSON content from the specified JSON file.
 	 * @param source the file containing JSON
 	 * @return the JSON content
-	 * @throws IOException on load error
+	 * @on load error
 	 */
-	public JsonContent<Object> from(File source) throws IOException {
+	public JsonContent<Object> from(File source) {
 		return getJsonContent(this.loader.getJson(source));
 	}
 
@@ -105,9 +103,9 @@ public class BasicJsonTester {
 	 * Create JSON content from the specified JSON input stream.
 	 * @param source the input stream containing JSON
 	 * @return the JSON content
-	 * @throws IOException on load error
+	 * @on load error
 	 */
-	public JsonContent<Object> from(InputStream source) throws IOException {
+	public JsonContent<Object> from(InputStream source) {
 		return getJsonContent(this.loader.getJson(source));
 	}
 
@@ -115,9 +113,9 @@ public class BasicJsonTester {
 	 * Create JSON content from the specified JSON resource.
 	 * @param source the resource containing JSON
 	 * @return the JSON content
-	 * @throws IOException on load error
+	 * @on load error
 	 */
-	public JsonContent<Object> from(Resource source) throws IOException {
+	public JsonContent<Object> from(Resource source) {
 		return getJsonContent(this.loader.getJson(source));
 	}
 

spring-boot-test/src/main/java/org/springframework/boot/test/json/JsonLoader.java

@@ -44,7 +44,7 @@ class JsonLoader {
 		return this.resourceLoadClass;
 	}
 
-	public String getJson(CharSequence source) throws IOException {
+	public String getJson(CharSequence source) {
 		if (source == null) {
 			return null;
 		}
@@ -55,24 +55,39 @@ class JsonLoader {
 		return source.toString();
 	}
 
-	public String getJson(String path, Class<?> resourceLoadClass) throws IOException {
+	public String getJson(String path, Class<?> resourceLoadClass) {
 		return getJson(new ClassPathResource(path, resourceLoadClass));
 	}
 
-	public String getJson(byte[] source) throws IOException {
+	public String getJson(byte[] source) {
 		return getJson(new ByteArrayInputStream(source));
 	}
 
-	public String getJson(File source) throws IOException {
-		return getJson(new FileInputStream(source));
+	public String getJson(File source) {
+		try {
+			return getJson(new FileInputStream(source));
+		}
+		catch (IOException ex) {
+			throw new IllegalStateException("Unable to load JSON from " + source, ex);
+		}
 	}
 
-	public String getJson(Resource source) throws IOException {
-		return getJson(source.getInputStream());
+	public String getJson(Resource source) {
+		try {
+			return getJson(source.getInputStream());
+		}
+		catch (IOException ex) {
+			throw new IllegalStateException("Unable to load JSON from " + source, ex);
+		}
 	}
 
-	public String getJson(InputStream source) throws IOException {
-		return FileCopyUtils.copyToString(new InputStreamReader(source));
+	public String getJson(InputStream source) {
+		try {
+			return FileCopyUtils.copyToString(new InputStreamReader(source));
+		}
+		catch (IOException ex) {
+			throw new IllegalStateException("Unable to load JSON from InputStream", ex);
+		}
 	}
 
 }