Add TestKit P2 methods [ECR-3050]

exonum-java-binding/core/rust/src/testkit/mod.rs

@@ -206,6 +206,6 @@ fn create_java_keypair<'a>(
         KEYPAIR_CLASS,
         "createKeyPair",
         KEYPAIR_CTOR_SIGNATURE,
-        &[public_key_byte_array.into(), secret_key_byte_array.into()],
+        &[secret_key_byte_array.into(), public_key_byte_array.into()],
     )
 }

exonum-java-binding/core/src/main/java/com/exonum/binding/proxy/AbstractCloseableNativeProxy.java

@@ -66,7 +66,6 @@ protected AbstractCloseableNativeProxy(long nativeHandle, boolean dispose) {
     this(nativeHandle, dispose, Collections.emptySet());
   }
 
-
   /**
    * Creates a native proxy.
    *

exonum-java-binding/testkit/src/main/java/com/exonum/binding/testkit/EmulatedNode.java

@@ -22,7 +22,7 @@
 import java.util.OptionalInt;
 
 /**
- * Context of the TestKit emulated node.
+ * Context of the TestKit emulated node, i.e., on which it instantiates and executes services.
  */
 public class EmulatedNode {
 
@@ -32,8 +32,8 @@ public class EmulatedNode {
   /**
    * Creates a context of an emulated node.
    *
-   * @param validatorId validator id of the validator node, less or equal to 0 in case of an
-   *     auditor node
+   * @param validatorId identifier of the validator node; or any negative value if the node is an
+   *     auditor
    * @param serviceKeyPair service key pair of the node
    */
   public EmulatedNode(int validatorId, KeyPair serviceKeyPair) {