[Test] Verify that metadata is captured with each slice of large logs

test/tesla/middleware/meta_logger_test.exs

@@ -1,6 +1,8 @@
 defmodule Tesla.Middleware.MetaLoggerTest do
   use ExUnit.Case, async: true
 
+  require Logger
+
   import ExUnit.CaptureLog
 
   alias Tesla.Middleware.MetaLogger, as: Subject
@@ -227,6 +229,46 @@ defmodule Tesla.Middleware.MetaLoggerTest do
       assert logs =~ "[debug] [#{inspect(Subject)}] #{String.duplicate("b", 100)}\n"
     end
 
+    test """
+    For POST requests \
+    when the max entry length is given and the logs are split \
+    the metadata is captured with each line
+    """ do
+      Logger.metadata(foo: "123123123")
+
+      body = String.duplicate("x", 100)
+
+      log_lines =
+        capture_log(fn ->
+          FakeClient.post("/huge-response", body, opts: [max_entry_length: 10])
+        end)
+        |> String.split("\n\n")
+
+      log_lines
+      |> Enum.each(fn log_line ->
+        assert log_line =~ "foo=123123123"
+      end)
+    end
+
+    test """
+    For GET requests \
+    when the max entry length is given and the logs are split \
+    the metadata is captured with each line
+    """ do
+      Logger.metadata(foo: "123123123")
+
+      log_lines =
+        capture_log(fn ->
+          FakeClient.get("/huge-response", opts: [max_entry_length: 10])
+        end)
+        |> String.split("\n\n")
+
+      log_lines
+      |> Enum.each(fn log_line ->
+        assert log_line =~ "foo=123123123"
+      end)
+    end
+
     test "when response is an error, logs the response with error log level" do
       logs = capture_log(fn -> FakeClient.get("/error") end)