Started adding unit tests

test/src/format.cpp

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+#include <format.h>
+#include <gtest/gtest.h>

test/src/parse.cpp

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+#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);
+}

test/src/utility.cpp

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+#include <utility.h>
+#include <gtest/gtest.h>
+
+TEST(Utility, const_pow) {
+    EXPECT_EQ(detail::const_pow(10, 0), 1);
+    EXPECT_EQ(detail::const_pow(0, 1), 0);
+    EXPECT_EQ(detail::const_pow(2, 8), 0b1'0000'0000);
+}
+