Create environment module

tests/CMakeLists.txt

@@ -10,6 +10,7 @@ endfunction()
 
 add_test_suites(
   am_tests.c
+  env_tests.c
   parse_tests.c
   store_tests.c
   token_tests.c

tests/env_tests.c

@@ -0,0 +1,78 @@
+#include "env.h"
+#include "unity.h"
+
+#include <string.h>
+
+static am_t am;
+static store_t store;
+
+static expr_t *integer(int64_t value)
+{
+	expr_t *expr = store_alloc(&store);
+	expr->is_atom = true;
+	expr->atom.type = ATOM_TYPE_INTEGER;
+	expr->atom.integer = value;
+	return expr;
+}
+
+static expr_t *symbol(const char *s)
+{
+	expr_t *expr = store_alloc(&store);
+	expr->is_atom = true;
+	expr->atom.type = ATOM_TYPE_SYMBOL;
+	memcpy(expr->atom.symbol.buf, s, strlen(s));
+	return expr;
+}
+
+void setUp(void)
+{
+	am_init(&am);
+	store_init(&store);
+	env_init(&am, &store);
+}
+
+void tearDown(void)
+{
+}
+
+static void test_set_foo_to_42_then_fetch(void)
+{
+	am.expr = symbol("foo");
+	am.val = integer(42);
+	env_set(&am, &store);
+
+	am.expr = symbol("foo");
+	am.val = NULL;
+	env_fetch(&am);
+
+	TEST_ASSERT_NOT_NULL(am.val);
+	TEST_ASSERT_TRUE(am.val->is_atom);
+	TEST_ASSERT_EQUAL(ATOM_TYPE_INTEGER, am.val->atom.type);
+	TEST_ASSERT_EQUAL(42, am.val->atom.integer);
+}
+
+static void test_update_foo_from_123_to_456_then_fetch(void)
+{
+	am.expr = symbol("foo");
+	am.val = integer(123);
+	env_set(&am, &store);
+	am.val = integer(456);
+	env_set(&am, &store);
+
+	am.expr = symbol("foo");
+	am.val = NULL;
+	env_fetch(&am);
+
+	TEST_ASSERT_NOT_NULL(am.val);
+	TEST_ASSERT_TRUE(am.val->is_atom);
+	TEST_ASSERT_EQUAL(ATOM_TYPE_INTEGER, am.val->atom.type);
+	TEST_ASSERT_EQUAL(456, am.val->atom.integer);
+}
+
+int main(void)
+{
+	UNITY_BEGIN();
+	RUN_TEST(test_set_foo_to_42_then_fetch);
+	RUN_TEST(test_update_foo_from_123_to_456_then_fetch);
+	return UNITY_END();
+}