From c687bfe6008bc7a2870e676873c87cd733ebc444 Mon Sep 17 00:00:00 2001
From: mo khan <mo.khan@gmail.com>
Date: Sun, 14 Jun 2020 21:57:08 -0600
Subject: Add test using mocks

---
 words.c      | 12 ++++++++++++
 words.h      |  1 +
 words_test.c | 21 +++++++++++++++++++++
 3 files changed, 34 insertions(+)

diff --git a/words.c b/words.c
index b9c236a..f5bac5f 100644
--- a/words.c
+++ b/words.c
@@ -1,3 +1,4 @@
+#include <stdlib.h>
 #include <string.h>
 
 int split_words(char *sentence) {
@@ -11,3 +12,14 @@ int split_words(char *sentence) {
   }
   return count;
 }
+
+void words(const char *sentence, void (*callback)(const char *, void *), void *memo) {
+  char *words = strdup(sentence);
+  int word_count = split_words(words);
+  char *word = words;
+  while (word_count-- > 0) {
+    (*callback)(word, memo);
+    word = word + strlen(word) + 1;
+  }
+  free(words);
+}
diff --git a/words.h b/words.h
index ac9e13b..f1716a4 100644
--- a/words.h
+++ b/words.h
@@ -1 +1,2 @@
 int split_words(char *sentence);
+void words(const char *sentence, void (*callback)(const char *, void *), void *memo);
diff --git a/words_test.c b/words_test.c
index 651ee6f..c7af6b9 100644
--- a/words_test.c
+++ b/words_test.c
@@ -1,4 +1,5 @@
 #include <cgreen/cgreen.h>
+#include <cgreen/mocks.h>
 
 #include "words.h"
 #include <string.h>
@@ -22,9 +23,29 @@ Ensure(Words, converts_spaces_to_zeroes) {
   free(sentence);
 }
 
+void mocked_callback(const char *word, void *memo) {
+  mock(word, memo);
+}
+
+Ensure(Words, invokes_callback_once_for_single_word_sentence) {
+  expect(mocked_callback,
+      when(word, is_equal_to_string("Word")), when(memo, is_null));
+  words("Word", &mocked_callback, NULL);
+}
+
+Ensure(Words, invokes_callback_for_each_word_in_a_phrase) {
+  expect(mocked_callback, when(word, is_equal_to_string("Birds")));
+  expect(mocked_callback, when(word, is_equal_to_string("of")));
+  expect(mocked_callback, when(word, is_equal_to_string("a")));
+  expect(mocked_callback, when(word, is_equal_to_string("feather")));
+  words("Birds of a feather", &mocked_callback, NULL);
+}
+
 TestSuite *words_tests() {
   TestSuite *suite = create_test_suite();
   add_test_with_context(suite, Words, returns_word_count);
   add_test_with_context(suite, Words, converts_spaces_to_zeroes);
+  add_test_with_context(suite, Words, invokes_callback_once_for_single_word_sentence);
+  add_test_with_context(suite, Words, invokes_callback_for_each_word_in_a_phrase);
   return suite;
 }
-- 
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