diff --git a/tdd_for_embedded_c/chapter02/Makefile b/tdd_for_embedded_c/chapter02/Makefile
new file mode 100644
index 0000000..4f50349
--- /dev/null
+++ b/tdd_for_embedded_c/chapter02/Makefile
@@ -0,0 +1,72 @@
+# ==========================================
+#   Unity Project - A Test Framework for C
+#   Copyright (c) 2007 Mike Karlesky, Mark VanderVoord, Greg Williams
+#   [Released under MIT License. Please refer to license.txt for details]
+# ==========================================
+
+#We try to detect the OS we are running on, and adjust commands as needed
+ifeq ($(OS),Windows_NT)
+	CLEANUP = del /F /Q
+	MKDIR = mkdir
+	TARGET_EXTENSION=.exe
+else
+	CLEANUP = rm -rf
+	MKDIR = mkdir -p
+	TARGET_EXTENSION=
+endif
+
+
+UNITY_ROOT=../../../../../Git/Unity
+C_COMPILER=gcc
+
+CFLAGS = -std=c11
+CFLAGS += -Wall
+CFLAGS += -Wextra
+CFLAGS += -Werror
+CFLAGS += -Wpointer-arith
+CFLAGS += -Wcast-align
+CFLAGS += -Wwrite-strings
+CFLAGS += -Wswitch-default
+CFLAGS += -Wunreachable-code
+CFLAGS += -Winit-self
+CFLAGS += -Wmissing-field-initializers
+CFLAGS += -Wno-unknown-pragmas
+CFLAGS += -Wstrict-prototypes
+CFLAGS += -Wundef
+CFLAGS += -Wold-style-definition
+CFLAGS += -Wmissing-prototypes
+CFLAGS += -Wmissing-declarations
+CFLAGS += -g
+CFLAGS += -ftest-coverage
+CFLAGS += -fprofile-arcs
+
+TARGET_BASE=test_sprintf
+TARGET = $(TARGET_BASE)$(TARGET_EXTENSION)
+SRC_FILES=\
+	$(UNITY_ROOT)/extras/fixture/src/unity_fixture.c \
+	$(UNITY_ROOT)/src/unity.c \
+	../test/SprintfTest.c \
+	../test/SprintfTestRunner.c \
+	../test/AllTests.c
+INC_DIRS=-I$(UNITY_ROOT)/src -I$(UNITY_ROOT)/extras/fixture/src
+SYMBOLS=
+
+
+all: clean tests
+
+
+.PHONY: tests
+tests: build/$(TARGET)
+
+build/$(TARGET):	test/*.c
+	@echo "Compiling"; cd build; $(C_COMPILER) $(CFLAGS) $(INC_DIRS) $(SYMBOLS) $(SRC_FILES) -o $(TARGET)
+	@echo "Running tests"; ./build/$(TARGET)
+	@echo "Preparing coverage"; cp build/*.gc* test/
+	@echo "Running coverage"; cd test; gcovr -r . -b -p --html --html-details -o ../build/cover/$(TARGET).html
+	@echo "Clearing intermediate files"; rm test/*.gc* build/*.gc*
+
+
+.PHONY: clean
+clean:
+	@echo "Cleaning $<"; $(CLEANUP) build/$(TARGET) build/cover/*
+
diff --git a/tdd_for_embedded_c/chapter02/test/AllTests.c b/tdd_for_embedded_c/chapter02/test/AllTests.c
new file mode 100644
index 0000000..31d489c
--- /dev/null
+++ b/tdd_for_embedded_c/chapter02/test/AllTests.c
@@ -0,0 +1,15 @@
+#include "unity_fixture.h"
+
+
+static void RunAllTests(void)
+{
+
+  RUN_TEST_GROUP(sprintf);
+
+}
+
+
+int main(int argc, const char * argv[])
+{
+  return UnityMain(argc, argv, RunAllTests);
+}
diff --git a/tdd_for_embedded_c/chapter02/test/SprintfTest.c b/tdd_for_embedded_c/chapter02/test/SprintfTest.c
new file mode 100644
index 0000000..f30d7d2
--- /dev/null
+++ b/tdd_for_embedded_c/chapter02/test/SprintfTest.c
@@ -0,0 +1,58 @@
+#include <string.h>
+#include "unity.h"
+#include "unity_fixture.h"
+
+
+TEST_GROUP(sprintf);
+
+
+static char output[100];
+static const char *expected;
+
+
+
+// This is run before each test
+TEST_SETUP(sprintf) {
+
+  memset(output, 0xaa, sizeof(output));
+  expected = "";
+
+}
+
+
+// This id run after each test
+TEST_TEAR_DOWN(sprintf) {
+}
+
+
+static void expect(const char *s) {
+
+  expected = s;
+
+}
+
+
+static void given(int charsWritten) {
+
+  TEST_ASSERT_EQUAL(strlen(expected), charsWritten);
+  TEST_ASSERT_EQUAL_STRING(expected, &output[1]);
+  TEST_ASSERT_EQUAL_HEX8(0xaa, output[strlen(expected)+2]);
+  TEST_ASSERT_EQUAL_HEX8(0xaa, output[0]);
+
+}
+
+
+TEST(sprintf, NoFormatOperations) {
+
+  expect("hey");
+  given(sprintf(&output[1], "%s", expected));
+
+}
+
+
+TEST(sprintf, InsertString) {
+
+  expect("Hello world\n");
+  given(sprintf(&output[1], "Hello %s\n", "world"));
+
+}
\ No newline at end of file
diff --git a/tdd_for_embedded_c/chapter02/test/SprintfTestRunner.c b/tdd_for_embedded_c/chapter02/test/SprintfTestRunner.c
new file mode 100644
index 0000000..88c6219
--- /dev/null
+++ b/tdd_for_embedded_c/chapter02/test/SprintfTestRunner.c
@@ -0,0 +1,10 @@
+#include "unity.h"
+#include "unity_fixture.h"
+
+
+TEST_GROUP_RUNNER(sprintf) {
+
+  RUN_TEST_CASE(sprintf, NoFormatOperations);
+  RUN_TEST_CASE(sprintf, InsertString);
+
+}
\ No newline at end of file