fix(tests): fix tests after previous commit

Author: nickysn

test/fixtures/addition_trace.json

@@ -232,7 +232,7 @@
   {
     "Event": {
       "kind": 0,
-      "content": "3",
+      "content": "3\n",
       "metadata": ""
     }
   }

test/fixtures/args_sum_trace.json

@@ -261,7 +261,7 @@
   {
     "Event": {
       "kind": 0,
-      "content": "6",
+      "content": "6\n",
       "metadata": ""
     }
   }

test/fixtures/array_sum_trace.json

@@ -521,7 +521,7 @@
   {
     "Event": {
       "kind": 0,
-      "content": "6",
+      "content": "6\n",
       "metadata": ""
     }
   }

test/test_kernel_patches.rb

@@ -49,7 +49,7 @@ def test_patching_and_basic_event_recording
     event_puts = @tracer1.events[1]
     assert_equal __FILE__, event_puts[:path]
     assert_equal expected_line_puts, event_puts[:lineno]
-    assert_equal "world", event_puts[:content]
+    assert_equal "world\n", event_puts[:content]
 
     event_print = @tracer1.events[2]
     assert_equal __FILE__, event_print[:path]
@@ -146,7 +146,7 @@ def test_correct_event_arguments
     assert_equal __FILE__, event_puts[:path], "Path for puts mismatch"
     assert_equal expected_line_puts_detailed, event_puts[:lineno], "Line number for puts mismatch"
     # puts calls to_s on each argument and prints each on a new line
-    assert_equal "detailed_puts\n{:key=>\"value\", :number=>123}", event_puts[:content], "Content for puts mismatch"
+    assert_equal "detailed_puts\n{:key=>\"value\", :number=>123}\n", event_puts[:content], "Content for puts mismatch"
 
 
     event_print = @tracer1.events[2]