--- /dev/null
+++ Libc/Libc-1158.1.2/tests/getenv.c
@@ -0,0 +1,67 @@
+#include <stdlib.h>
+
+#include <darwintest.h>
+
+T_DECL(setenv_getenv, "getenv returns value set by setenv")
+{
+	char *name = "foo";
+	char *value = "bar";
+	int setenv_rc = setenv(name, value, 0);
+	T_EXPECT_EQ(0, setenv_rc, "setenv must succeed with 0 return code");
+	char *getenv_result = getenv(name);
+	T_EXPECT_EQ_STR(value, getenv_result, "getenv must return setenv argument");
+}
+
+T_DECL(setenv_overwrite, "getenv returns the latest setenv argument")
+{
+	char *name = "foo";
+	char *first_value = "bar";
+	char *second_value = "baz";
+	int setenv_rc = 0;
+	setenv_rc = setenv(name, first_value, 0);
+	T_EXPECT_EQ(0, setenv_rc, "setenv must succeed with 0 return code");
+	setenv_rc = setenv(name, second_value, 1);
+	T_EXPECT_EQ(0, setenv_rc, "setenv must succeed with 0 return code");
+	char *getenv_result = getenv(name);
+	T_EXPECT_EQ_STR(second_value, getenv_result, "getenv must return the latest setenv argument");
+}
+
+T_DECL(setenv_dont_overwrite, "setenv respects overwrite")
+{
+	char *name = "foo";
+	char *first_value = "bar";
+	char *second_value = "baz";
+	int setenv_rc = 0;
+	setenv_rc = setenv(name, first_value, 0);
+	T_EXPECT_EQ(0, setenv_rc, "setenv must succeed with 0 return code");
+	setenv_rc = setenv(name, second_value, 0);
+	T_EXPECT_EQ(0, setenv_rc, "setenv must succeed with 0 return code");
+	char *getenv_result = getenv(name);
+	T_EXPECT_EQ_STR(first_value, getenv_result, "the second setenv must not overwrite the first one");
+}
+
+/* There are tests for leading '=' in values because BSDs used to strip them off: rdar://problem/19342460 */
+
+T_DECL(setenv_accepts_leading_eq_sign, "setenv accepts values starting with '='")
+{
+	char *name = "foo";
+	char *value = "=bar";
+	int setenv_rc = setenv(name, value, 0);
+	T_EXPECT_EQ(0, setenv_rc, "setenv must succeed with 0 return code");
+	char *getenv_result = getenv(name);
+	T_EXPECT_EQ_STR(value, getenv_result, "getenv must return setenv argument");
+}
+
+T_DECL(setenv_accepts_leading_eq_sign_overwrite, "setenv accepts values starting with '=' when overwriting an existing value")
+{
+	char *name = "foo";
+	char *first_value = "bar";
+	char *second_value = "=baz";
+	int setenv_rc = 0;
+	setenv_rc = setenv(name, first_value, 0);
+	T_EXPECT_EQ(0, setenv_rc, "setenv must succeed with 0 return code");
+	setenv_rc = setenv(name, second_value, 1);
+	T_EXPECT_EQ(0, setenv_rc, "setenv must succeed with 0 return code");
+	char *getenv_result = getenv(name);
+	T_EXPECT_EQ_STR(second_value, getenv_result, "getenv must return the latest setenv argument");
+}