diff --git a/api/Stream.cpp b/api/Stream.cpp
index f6f9bda6..df361997 100644
--- a/api/Stream.cpp
+++ b/api/Stream.cpp
@@ -255,6 +255,14 @@ String Stream::readStringUntil(char terminator)
   return ret;
 }
 
+String Stream::readLine()
+{
+  String ret = readStringUntil('\n');
+  if (ret.endsWith("\r"))
+      ret.remove(ret.length()-1);
+  return ret;
+}
+
 int Stream::findMulti( struct Stream::MultiTarget *targets, int tCount) {
   // any zero length target string automatically matches and would make
   // a mess of the rest of the algorithm.
diff --git a/api/Stream.h b/api/Stream.h
index e81c71ba..b407fd73 100644
--- a/api/Stream.h
+++ b/api/Stream.h
@@ -67,7 +67,7 @@ class Stream : public Print
 
   void setTimeout(unsigned long timeout);  // sets maximum milliseconds to wait for stream data, default is 1 second
   unsigned long getTimeout(void) { return _timeout; }
-  
+
   bool find(const char *target);   // reads data from the stream until the target string is found
   bool find(const uint8_t *target) { return find ((const char *)target); }
   // returns true if target string is found, false if timed out (see setTimeout)
@@ -107,6 +107,7 @@ class Stream : public Print
   // Arduino String functions to be added here
   String readString();
   String readStringUntil(char terminator);
+  String readLine();
 
   protected:
   long parseInt(char ignore) { return parseInt(SKIP_ALL, ignore); }
@@ -130,4 +131,4 @@ class Stream : public Print
 
 }
 
-using arduino::Stream;
\ No newline at end of file
+using arduino::Stream;
diff --git a/api/String.cpp b/api/String.cpp
index 4f176374..a13d6b82 100644
--- a/api/String.cpp
+++ b/api/String.cpp
@@ -625,6 +625,18 @@ String String::substring(unsigned int left, unsigned int right) const
 /*  Modification                             */
 /*********************************************/
 
+void String::insert(const String &str, unsigned int index, unsigned int length)
+{
+    if (index > len) return;
+    length = length < str.len ? length : str.len;
+    unsigned int size = len + length;
+    if (size > capacity && !reserve(size)) return; // XXX: tell user!
+    memmove(buffer + index + length, buffer + index, len - index + 1);
+    memcpy(buffer + index, str.buffer, length);
+    len += length;
+    return;
+}
+
 void String::replace(char find, char replace)
 {
 	if (!buffer) return;
diff --git a/api/String.h b/api/String.h
index 73a872de..380fc4e1 100644
--- a/api/String.h
+++ b/api/String.h
@@ -202,6 +202,8 @@ class String
 	String substring( unsigned int beginIndex, unsigned int endIndex ) const;
 
 	// modification
+	void insert(char c, unsigned int index) { return insert(String(c), index, 1); };
+	void insert(const String &str, unsigned int index, unsigned int length);
 	void replace(char find, char replace);
 	void replace(const String& find, const String& replace);
 	void remove(unsigned int index);
diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index f6bcc123..9deb8feb 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -69,6 +69,7 @@ set(TEST_SRCS
   src/Stream/test_parseInt.cpp
   src/Stream/test_readBytes.cpp
   src/Stream/test_readBytesUntil.cpp
+  src/Stream/test_readLine.cpp
   src/Stream/test_readString.cpp
   src/Stream/test_readStringUntil.cpp
   src/Stream/test_setTimeout.cpp
@@ -81,6 +82,7 @@ set(TEST_SRCS
   src/String/test_indexOf.cpp
   src/String/test_lastIndexOf.cpp
   src/String/test_length.cpp
+  src/String/test_insert.cpp
   src/String/test_move.cpp
   src/String/test_remove.cpp
   src/String/test_replace.cpp
diff --git a/test/src/Stream/test_readLine.cpp b/test/src/Stream/test_readLine.cpp
new file mode 100644
index 00000000..29455048
--- /dev/null
+++ b/test/src/Stream/test_readLine.cpp
@@ -0,0 +1,43 @@
+/*
+ * Copyright (c) 2023 Arduino.  All rights reserved.
+ */
+
+/**************************************************************************************
+ * INCLUDE
+ **************************************************************************************/
+
+#include <catch.hpp>
+
+#include <MillisFake.h>
+#include <StreamMock.h>
+
+/**************************************************************************************
+ * TEST CODE
+ **************************************************************************************/
+
+TEST_CASE ("Testing 'readLine' with no EOL character", "[Stream-readLine-01]")
+{
+    StreamMock mock;
+    mock.setTimeout(10);
+    millis_autoOn();
+    mock << "Hello Arduino";
+    REQUIRE(mock.readLine() == arduino::String("Hello Arduino"));
+}
+
+TEST_CASE ("Testing 'readLine' with Unix EOL character", "[Stream-readLine-02]")
+{
+    StreamMock mock;
+    mock.setTimeout(10);
+    millis_autoOn();
+    mock << "Hello\nArduino\n";
+    REQUIRE(mock.readLine() == arduino::String("Hello"));
+}
+
+TEST_CASE ("Testing 'readLine' with DOS EOL character", "[Stream-readLine-03]")
+{
+    StreamMock mock;
+    mock.setTimeout(10);
+    millis_autoOn();
+    mock << "Hello\r\nArduino\r\n";
+    REQUIRE(mock.readLine() == arduino::String("Hello"));
+}
diff --git a/test/src/String/test_insert.cpp b/test/src/String/test_insert.cpp
new file mode 100644
index 00000000..4ef708b3
--- /dev/null
+++ b/test/src/String/test_insert.cpp
@@ -0,0 +1,47 @@
+/*
+ * Copyright (c) 2023 Arduino.  All rights reserved.
+ */
+
+/**************************************************************************************
+ * INCLUDE
+ **************************************************************************************/
+
+#include <catch.hpp>
+
+#include <api/String.h>
+
+#include "StringPrinter.h"
+
+/**************************************************************************************
+ * TEST CODE
+ **************************************************************************************/
+
+TEST_CASE ("Testing String::insert(char, index)", "[String-insert-01]")
+{
+  arduino::String str = "ello";
+  str.insert('h', 0);
+  REQUIRE(str == String("hello"));
+}
+
+TEST_CASE ("Testing String::insert(char, index) with index > length", "[String-insert-02]")
+{
+  arduino::String str = "Hello Arduino";
+  str.insert('!', str.length() + 1);
+  REQUIRE(str == String("Hello Arduino"));
+}
+
+
+TEST_CASE ("Testing String::insert(String, index, length) with length >= inserted length", "[String-insert-03]")
+{
+    arduino::String str = "hello ";
+    str.insert("world", str.length(), 5);
+    REQUIRE(str == String("hello world"));
+}
+
+TEST_CASE ("Testing String::insert(String, index, length) with length < inserted length", "[String-insert-04]")
+{
+    arduino::String str = "Hello ";
+    str.insert("Arduino 1234", str.length(), 7);
+    REQUIRE(str == String("Hello Arduino"));
+}
+