implement getting InputStream as String

src/main/java/ResourceApi.java

@@ -1,4 +1,7 @@
+import java.io.BufferedReader;
+import java.io.IOException;
 import java.io.InputStream;
+import java.io.InputStreamReader;
 
 public class ResourceApi {
 
@@ -13,4 +16,17 @@ public class ResourceApi {
             return inputStream;
         }
     }
+
+    public String getStringFromInputStream(InputStream inputStream) throws IOException {
+        BufferedReader in = new BufferedReader(new InputStreamReader(inputStream));
+        String inputLine;
+        StringBuffer response = new StringBuffer();
+
+        while ((inputLine = in.readLine()) != null) {
+            response.append(inputLine + "\n");
+        }
+        in.close();
+
+        return response.toString();
+    }
 }

src/test/java/ResourceApiTest.java

@@ -1,13 +1,10 @@
 import org.junit.jupiter.api.BeforeAll;
 import org.junit.jupiter.api.Test;
 
-import java.io.BufferedReader;
-import java.io.IOException;
-import java.io.InputStream;
-import java.io.InputStreamReader;
+import java.io.*;
+import java.nio.charset.StandardCharsets;
 
-import static org.junit.jupiter.api.Assertions.assertThrowsExactly;
-import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.junit.jupiter.api.Assertions.*;
 
 class ResourceApiTest {
 
@@ -36,4 +33,11 @@ class ResourceApiTest {
 
         assertTrue(response.toString().contains("Alleinherrschaft"));
     }
+
+    @Test
+    void getStringFromInputStream() throws IOException {
+        String testString = "I am a test string!\nAnother test line.\n";
+        InputStream is = new ByteArrayInputStream(testString.getBytes(StandardCharsets.UTF_8));
+        assertEquals(resourceApi.getStringFromInputStream(is), testString);
+    }
 }