diff --git a/2019/14.cpp b/2019/14.cpp
index 74779e2..760eb7a 100644
--- a/2019/14.cpp
+++ b/2019/14.cpp
@@ -9,6 +9,8 @@
 #include <vector>
 #include <tuple>
 
+#include <doctest.h>
+
 #include <aocpp/Startup.hpp>
 
 namespace {
@@ -140,6 +142,92 @@ auto ComputeFuel(Machine & machine, std::int64_t ore) {
 
 } // namespace
 
+TEST_SUITE("documented examples") {
+  TEST_CASE("a") {
+    std::istringstream in {
+      "10 ORE => 10 A\n"
+      "1 ORE => 1 B\n"
+      "7 A, 1 B => 1 C\n"
+      "7 A, 1 C => 1 D\n"
+      "7 A, 1 D => 1 E\n"
+      "7 A, 1 E => 1 FUEL\n"};
+    Machine m{Parse(in)};
+    REQUIRE(m(1) == 31);
+  }
+
+  TEST_CASE("b") {
+    std::istringstream in {
+      "9 ORE => 2 A\n"
+      "8 ORE => 3 B\n"
+      "7 ORE => 5 C\n"
+      "3 A, 4 B => 1 AB\n"
+      "5 B, 7 C => 1 BC\n"
+      "4 C, 1 A => 1 CA\n"
+      "2 AB, 3 BC, 4 CA => 1 FUEL\n"};
+    Machine m{Parse(in)};
+    REQUIRE(m(1) == 165);
+  }
+
+  TEST_CASE("c") {
+    std::istringstream in {
+      "157 ORE => 5 NZVS\n"
+      "165 ORE => 6 DCFZ\n"
+      "44 XJWVT, 5 KHKGT, 1 QDVJ, 29 NZVS, 9 GPVTF, 48 HKGWZ => 1 FUEL\n"
+      "12 HKGWZ, 1 GPVTF, 8 PSHF => 9 QDVJ\n"
+      "179 ORE => 7 PSHF\n"
+      "177 ORE => 5 HKGWZ\n"
+      "7 DCFZ, 7 PSHF => 2 XJWVT\n"
+      "165 ORE => 2 GPVTF\n"
+      "3 DCFZ, 7 NZVS, 5 HKGWZ, 10 PSHF => 8 KHKGT\n"};
+    Machine m{Parse(in)};
+    REQUIRE(m(1) == 13312);
+    REQUIRE(ComputeFuel(m, 1'000'000'000'000) == 82892753);
+  }
+
+  TEST_CASE("d") {
+    std::istringstream in {
+      "2 VPVL, 7 FWMGM, 2 CXFTF, 11 MNCFX => 1 STKFG\n"
+      "17 NVRVD, 3 JNWZP => 8 VPVL\n"
+      "53 STKFG, 6 MNCFX, 46 VJHF, 81 HVMC, 68 CXFTF, 25 GNMV => 1 FUEL\n"
+      "22 VJHF, 37 MNCFX => 5 FWMGM\n"
+      "139 ORE => 4 NVRVD\n"
+      "144 ORE => 7 JNWZP\n"
+      "5 MNCFX, 7 RFSQX, 2 FWMGM, 2 VPVL, 19 CXFTF => 3 HVMC\n"
+      "5 VJHF, 7 MNCFX, 9 VPVL, 37 CXFTF => 6 GNMV\n"
+      "145 ORE => 6 MNCFX\n"
+      "1 NVRVD => 8 CXFTF\n"
+      "1 VJHF, 6 MNCFX => 4 RFSQX\n"
+      "176 ORE => 6 VJHF\n"};
+    Machine m{Parse(in)};
+    REQUIRE(m(1) == 180697);
+    REQUIRE(ComputeFuel(m, 1'000'000'000'000) == 5586022);
+  }
+
+  TEST_CASE("e") {
+    std::istringstream in {
+      "171 ORE => 8 CNZTR\n"
+      "7 ZLQW, 3 BMBT, 9 XCVML, 26 XMNCP, 1 WPTQ, 2 MZWV, 1 RJRHP => 4 PLWSL\n"
+      "114 ORE => 4 BHXH\n"
+      "14 VRPVC => 6 BMBT\n"
+      "6 BHXH, 18 KTJDG, 12 WPTQ, 7 PLWSL, 31 FHTLT, 37 ZDVW => 1 FUEL\n"
+      "6 WPTQ, 2 BMBT, 8 ZLQW, 18 KTJDG, 1 XMNCP, 6 MZWV, 1 RJRHP => 6 FHTLT\n"
+      "15 XDBXC, 2 LTCX, 1 VRPVC => 6 ZLQW\n"
+      "13 WPTQ, 10 LTCX, 3 RJRHP, 14 XMNCP, 2 MZWV, 1 ZLQW => 1 ZDVW\n"
+      "5 BMBT => 4 WPTQ\n"
+      "189 ORE => 9 KTJDG\n"
+      "1 MZWV, 17 XDBXC, 3 XCVML => 2 XMNCP\n"
+      "12 VRPVC, 27 CNZTR => 2 XDBXC\n"
+      "15 KTJDG, 12 BHXH => 5 XCVML\n"
+      "3 BHXH, 2 VRPVC => 7 MZWV\n"
+      "121 ORE => 7 VRPVC\n"
+      "7 XCVML => 6 RJRHP\n"
+      "5 BHXH, 4 VRPVC => 5 LTCX\n"};
+    Machine m{Parse(in)};
+    REQUIRE(m(1) == 2210736);
+    REQUIRE(ComputeFuel(m, 1'000'000'000'000) == 460664);
+  }
+}
+
 auto main(int argc, char** argv) -> int {
   auto recipes = Parse(aocpp::Startup(argc, argv));
   auto machine = Machine(recipes);