Started adding unit tests

test/src/parse.cpp

@@ -0,0 +1,18 @@
+#include <gtest/gtest.h>
+#include <parse.h>
+
+TEST(Parse, ast_node) {
+    ast_node_t ast_node1{'a'};
+    ast_node_t ast_node2{'a'};
+    ast_node_t ast_node3{'b'};
+
+    EXPECT_EQ(ast_node1 == ast_node2, true);
+    EXPECT_EQ(ast_node1 == ast_node3, false);
+}
+
+TEST(Parse, chars_only) {
+    constexpr std::array<ast_node_t, 8> control = {'a', 'b', 'c', 'd',
+                                                   'e', 'f', 'g', 'h'};
+
+    EXPECT_EQ(detail::parse_string<"abcdefgh">().value, control);
+}