Change README to explain extractArgs utils

Author: andrebonna

README.md

@@ -39,8 +39,14 @@ Add to your pom.xml dependencies section:
 package com.example;
 
 import static io.github.jsonSnapshot.SnapshotMatcher.*;
+import static io.github.jsonSnapshot.SnapshotUtils.*;
 
 public class ExampleTest {
+
+    @Mock
+    private FakeObject fakeObject;
+
+
     @BeforeClass
     public static void beforeAll() {
         start();
@@ -51,10 +57,32 @@ public class ExampleTest {
         validateSnapshots();
     }
 
-    @Test
+    @Test // Snapshot any object
     public void shouldShowSnapshotExample() {
         expect("<any type of object>").toMatchSnapshot();
     }
+
+    @Test // Snapshot arguments passed to mocked object
+    public void shouldExtractArgsFromMethod() {
+
+        fakeObject.fakeMethod("test1", 1L, Arrays.asList("listTest1"));
+        fakeObject.fakeMethod("test2", 2L, Arrays.asList("listTest1", "listTest2"));
+
+        expect(extractArgs(fakeObject, "fakeMethod", String.class, Long.class, List.class)).toMatchSnapshot();
+
+    }
+    
+    class FakeObject {
+        private String id;
+
+        private Integer value;
+
+        private String name;
+
+        void fakeMethod(String fakeName, Long fakeNumber, List<String> fakeList) {
+
+        }
+    }
 }
 ```
 
@@ -63,6 +91,29 @@ When the test runs for the first time, the framework will create a snapshot file
 com.example.ExampleTest.shouldShowSnapshotExample=[
     "<any type of object>"
 ]
+
+
+com.example.ExampleTest.shouldExtractArgsFromMethod=[
+  {
+    "FakeObject.fakeMethod": [
+      {
+        "arg0": "test1",
+        "arg1": 1,
+        "arg2": [
+          "listTest1"
+        ]
+      },
+      {
+        "arg0": "test2",
+        "arg1": 2,
+        "arg2": [
+          "listTest1",
+          "listTest2"
+        ]
+      }
+    ]
+  }
+]
 ```
 
 Whenever it runs again, the `expect` method argument will be automatically validated with the `.snap` file. That is why you should commit every `.snap` file created.

src/test/java/io/github/jsonSnapshot/SnapshotUtilsTest.java

@@ -33,7 +33,7 @@ public static void afterAll() {
 
 
     @Test
-    public void shouldExtractArgsFromMethod() throws NoSuchMethodException {
+    public void shouldExtractArgsFromMethod() {
 
         fakeObject.fakeMethod("test1", 1L, Arrays.asList("listTest1"));
         fakeObject.fakeMethod("test2", 2L, Arrays.asList("listTest1", "listTest2"));