diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index c9feace..9496c9f 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -62,5 +62,6 @@ jobs:
             ./target
             ~/.cargo
           key: ${{ runner.os }}-cargo-dev-${{ hashFiles('**/Cargo.lock') }}
+      - run: cargo test --all-targets --all-features
       - run: bash test/test_all.sh
       - run: git diff --exit-code --quiet || exit 1
diff --git a/Cargo.lock b/Cargo.lock
index d9946d0..fe6a020 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -37,6 +37,23 @@ version = "1.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cf1de2fe8c75bc145a2f577add951f8134889b4795d47466a54a5c846d691693"
 
+[[package]]
+name = "bitflags"
+version = "2.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cf4b9d6a944f767f8e5e0db018570623c85f3d925ac718db4e06d0187adb21c1"
+
+[[package]]
+name = "bstr"
+version = "0.2.17"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ba3569f383e8f1598449f1a423e72e99569137b47740b1da11ef19af3d5c3223"
+dependencies = [
+ "lazy_static",
+ "memchr",
+ "regex-automata 0.1.10",
+]
+
 [[package]]
 name = "cc"
 version = "1.0.83"
@@ -60,13 +77,25 @@ checksum = "37e58ac78573c40708d45522f0d80fa2f01cc4f9b4e2bf749807255454312002"
 dependencies = [
  "ansi_term",
  "atty",
- "bitflags",
+ "bitflags 1.2.1",
  "strsim",
  "textwrap",
  "unicode-width",
  "vec_map",
 ]
 
+[[package]]
+name = "console"
+version = "0.15.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0e1f83fc076bd6dd27517eacdf25fef6c4dfe5f1d7448bafaaf3a26f13b5e4eb"
+dependencies = [
+ "encode_unicode",
+ "lazy_static",
+ "libc",
+ "windows-sys",
+]
+
 [[package]]
 name = "convert_case"
 version = "0.6.0"
@@ -76,6 +105,28 @@ dependencies = [
  "unicode-segmentation",
 ]
 
+[[package]]
+name = "encode_unicode"
+version = "0.3.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a357d28ed41a50f9c765dbfe56cbc04a64e53e5fc58ba79fbc34c10ef3df831f"
+
+[[package]]
+name = "errno"
+version = "0.3.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "534c5cf6194dfab3db3242765c03bbe257cf92f22b38f6bc0c58d59108a820ba"
+dependencies = [
+ "libc",
+ "windows-sys",
+]
+
+[[package]]
+name = "fastrand"
+version = "2.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9fc0510504f03c51ada170672ac806f1f105a88aa97a5281117e1ddc3368e51a"
+
 [[package]]
 name = "generator"
 version = "0.7.5"
@@ -89,6 +140,18 @@ dependencies = [
  "windows",
 ]
 
+[[package]]
+name = "goldenfile"
+version = "1.7.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a0d5c44265baec620ea19c97b4ce9f068e28f8c3d7faccc483f02968b5e3c587"
+dependencies = [
+ "scopeguard",
+ "similar-asserts",
+ "tempfile",
+ "yansi",
+]
+
 [[package]]
 name = "heck"
 version = "0.3.1"
@@ -121,9 +184,15 @@ checksum = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
 
 [[package]]
 name = "libc"
-version = "0.2.80"
+version = "0.2.154"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4d58d1b70b004888f764dfbf6a26a3b0342a1632d33968e4a179d8011c760614"
+checksum = "ae743338b92ff9146ce83992f766a31066a91a8c84a45e0e9f21e7cf6de6d346"
+
+[[package]]
+name = "linux-raw-sys"
+version = "0.4.13"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "01cda141df6706de531b6c46c3a33ecca755538219bd484262fa09410c13539c"
 
 [[package]]
 name = "log"
@@ -275,6 +344,19 @@ version = "0.8.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c08c74e62047bb2de4ff487b251e4a92e24f48745648451635cec7d591162d9f"
 
+[[package]]
+name = "rustix"
+version = "0.38.34"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "70dc5ec042f7a43c4a73241207cecc9873a06d45debb38b329f8541d85c2730f"
+dependencies = [
+ "bitflags 2.5.0",
+ "errno",
+ "libc",
+ "linux-raw-sys",
+ "windows-sys",
+]
+
 [[package]]
 name = "rustversion"
 version = "1.0.14"
@@ -302,6 +384,12 @@ version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e1cf6437eb19a8f4a6cc0f7dca544973b0b78843adbfeb3683d1a94a0024a294"
 
+[[package]]
+name = "scopeguard"
+version = "1.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "94143f37725109f92c262ed2cf5e59bce7498c01bcc1502d7b9afe439a4e9f49"
+
 [[package]]
 name = "serde"
 version = "1.0.193"
@@ -342,6 +430,26 @@ dependencies = [
  "lazy_static",
 ]
 
+[[package]]
+name = "similar"
+version = "2.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fa42c91313f1d05da9b26f267f931cf178d4aba455b4c4622dd7355eb80c6640"
+dependencies = [
+ "bstr",
+ "unicode-segmentation",
+]
+
+[[package]]
+name = "similar-asserts"
+version = "1.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e041bb827d1bfca18f213411d51b665309f1afb37a04a5d1464530e13779fc0f"
+dependencies = [
+ "console",
+ "similar",
+]
+
 [[package]]
 name = "smallvec"
 version = "1.11.2"
@@ -409,6 +517,18 @@ dependencies = [
  "unicode-ident",
 ]
 
+[[package]]
+name = "tempfile"
+version = "3.10.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "85b77fafb263dd9d05cbeac119526425676db3784113aa9295c88498cbf8bff1"
+dependencies = [
+ "cfg-if",
+ "fastrand",
+ "rustix",
+ "windows-sys",
+]
+
 [[package]]
 name = "textwrap"
 version = "0.11.0"
@@ -494,6 +614,7 @@ name = "tsync"
 version = "2.2.0"
 dependencies = [
  "convert_case",
+ "goldenfile",
  "proc-macro2",
  "quote",
  "serde",
@@ -599,7 +720,16 @@ version = "0.48.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e686886bc078bc1b0b600cac0147aadb815089b6e4da64016cbd754b6342700f"
 dependencies = [
- "windows-targets",
+ "windows-targets 0.48.5",
+]
+
+[[package]]
+name = "windows-sys"
+version = "0.52.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "282be5f36a8ce781fad8c8ae18fa3f9beff57ec1b52cb3de0789201425d9a33d"
+dependencies = [
+ "windows-targets 0.52.5",
 ]
 
 [[package]]
@@ -608,13 +738,29 @@ version = "0.48.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9a2fa6e2155d7247be68c096456083145c183cbbbc2764150dda45a87197940c"
 dependencies = [
- "windows_aarch64_gnullvm",
- "windows_aarch64_msvc",
- "windows_i686_gnu",
- "windows_i686_msvc",
- "windows_x86_64_gnu",
- "windows_x86_64_gnullvm",
- "windows_x86_64_msvc",
+ "windows_aarch64_gnullvm 0.48.5",
+ "windows_aarch64_msvc 0.48.5",
+ "windows_i686_gnu 0.48.5",
+ "windows_i686_msvc 0.48.5",
+ "windows_x86_64_gnu 0.48.5",
+ "windows_x86_64_gnullvm 0.48.5",
+ "windows_x86_64_msvc 0.48.5",
+]
+
+[[package]]
+name = "windows-targets"
+version = "0.52.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6f0713a46559409d202e70e28227288446bf7841d3211583a4b53e3f6d96e7eb"
+dependencies = [
+ "windows_aarch64_gnullvm 0.52.5",
+ "windows_aarch64_msvc 0.52.5",
+ "windows_i686_gnu 0.52.5",
+ "windows_i686_gnullvm",
+ "windows_i686_msvc 0.52.5",
+ "windows_x86_64_gnu 0.52.5",
+ "windows_x86_64_gnullvm 0.52.5",
+ "windows_x86_64_msvc 0.52.5",
 ]
 
 [[package]]
@@ -623,38 +769,92 @@ version = "0.48.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2b38e32f0abccf9987a4e3079dfb67dcd799fb61361e53e2882c3cbaf0d905d8"
 
+[[package]]
+name = "windows_aarch64_gnullvm"
+version = "0.52.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7088eed71e8b8dda258ecc8bac5fb1153c5cffaf2578fc8ff5d61e23578d3263"
+
 [[package]]
 name = "windows_aarch64_msvc"
 version = "0.48.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "dc35310971f3b2dbbf3f0690a219f40e2d9afcf64f9ab7cc1be722937c26b4bc"
 
+[[package]]
+name = "windows_aarch64_msvc"
+version = "0.52.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9985fd1504e250c615ca5f281c3f7a6da76213ebd5ccc9561496568a2752afb6"
+
 [[package]]
 name = "windows_i686_gnu"
 version = "0.48.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a75915e7def60c94dcef72200b9a8e58e5091744960da64ec734a6c6e9b3743e"
 
+[[package]]
+name = "windows_i686_gnu"
+version = "0.52.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "88ba073cf16d5372720ec942a8ccbf61626074c6d4dd2e745299726ce8b89670"
+
+[[package]]
+name = "windows_i686_gnullvm"
+version = "0.52.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "87f4261229030a858f36b459e748ae97545d6f1ec60e5e0d6a3d32e0dc232ee9"
+
 [[package]]
 name = "windows_i686_msvc"
 version = "0.48.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8f55c233f70c4b27f66c523580f78f1004e8b5a8b659e05a4eb49d4166cca406"
 
+[[package]]
+name = "windows_i686_msvc"
+version = "0.52.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "db3c2bf3d13d5b658be73463284eaf12830ac9a26a90c717b7f771dfe97487bf"
+
 [[package]]
 name = "windows_x86_64_gnu"
 version = "0.48.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "53d40abd2583d23e4718fddf1ebec84dbff8381c07cae67ff7768bbf19c6718e"
 
+[[package]]
+name = "windows_x86_64_gnu"
+version = "0.52.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4e4246f76bdeff09eb48875a0fd3e2af6aada79d409d33011886d3e1581517d9"
+
 [[package]]
 name = "windows_x86_64_gnullvm"
 version = "0.48.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0b7b52767868a23d5bab768e390dc5f5c55825b6d30b86c844ff2dc7414044cc"
 
+[[package]]
+name = "windows_x86_64_gnullvm"
+version = "0.52.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "852298e482cd67c356ddd9570386e2862b5673c85bd5f88df9ab6802b334c596"
+
 [[package]]
 name = "windows_x86_64_msvc"
 version = "0.48.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ed94fce61571a4006852b7389a063ab983c02eb1bb37b47f8272ce92d06d9538"
+
+[[package]]
+name = "windows_x86_64_msvc"
+version = "0.52.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bec47e5bfd1bff0eeaf6d8b485cc1074891a197ab4225d504cb7a1ab88b02bf0"
+
+[[package]]
+name = "yansi"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cfe53a6657fd280eaa890a3bc59152892ffa3e30101319d168b781ed6529b049"
diff --git a/Cargo.toml b/Cargo.toml
index aa8e7af..3cbb965 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -27,6 +27,7 @@ state = "0.6.0"
 
 [dev-dependencies]
 serde = { version = "1", features = ["derive"] }
+goldenfile = "1.7.1"
 
 [lib]
 name = "tsync"
diff --git a/tests/codegen.rs b/tests/codegen.rs
new file mode 100644
index 0000000..ef86a96
--- /dev/null
+++ b/tests/codegen.rs
@@ -0,0 +1,222 @@
+//! Note: if multiple tests that use the same goldenfile are run in parallel, there may be a race condition.
+
+use goldenfile::Mint;
+
+use std::{io::Write, path::PathBuf};
+
+/// Register the goldenfiles for a specific test.
+/// This function returns a mint that, when dropped, will compare the "goldenfiles" to the actual output.
+/// If they differ, the test will fail.
+fn register_goldenfile<P: AsRef<std::path::Path>>(mint: &mut Mint, base_path: P, name: &str) {
+    // Register the goldenfile
+    let mut golden = mint.new_goldenfile(name).unwrap();
+
+    // Fill the goldenfile with the current content of the file.
+    golden
+        .write_all(&std::fs::read(base_path.as_ref().join(name)).unwrap())
+        .unwrap();
+}
+
+/// Teardown the mint.
+/// When the mint is dropped, it will compare the goldenfiles to the actual output.
+/// But we also want to reset the goldenfiles to their original state.
+fn teardown_mint(mint: Mint) {
+    // check the goldenfiles, and catch the panic if one occurs so we can reset the goldenfiles afterwards.
+    let res = std::panic::catch_unwind(std::panic::AssertUnwindSafe(|| {
+        mint.check_goldenfiles();
+    }));
+
+    // reset the goldenfiles to their original state.
+    mint.update_goldenfiles();
+
+    // if the check_goldenfiles panicked, panic again.
+    if let Err(err) = res {
+        std::panic::resume_unwind(err);
+    }
+
+    // drop the mint
+    drop(mint);
+}
+
+#[test]
+fn test_const() {
+    let base_path = PathBuf::from("test/const");
+    let input = base_path.join("rust.rs");
+    let output1 = base_path.join("typescript.d.ts");
+    let output2 = base_path.join("typescript.ts");
+
+    // Create a new goldenfile mint
+    let mut mint = Mint::new(&base_path);
+    // Register the goldenfiles
+    register_goldenfile(&mut mint, &base_path, "typescript.d.ts");
+    register_goldenfile(&mut mint, &base_path, "typescript.ts");
+
+    // Generate the typescript definitions
+    tsync::generate_typescript_defs(vec![input.clone()], output1, false, false);
+    tsync::generate_typescript_defs(vec![input], output2, false, false);
+
+    // Compare the generated files to the checked-in golden files
+    teardown_mint(mint);
+}
+
+#[test]
+fn test_const_enum_numeric() {
+    let base_path = PathBuf::from("test/const_enum_numeric");
+    let input = base_path.join("rust.rs");
+    let output1 = base_path.join("typescript.d.ts");
+    let output2 = base_path.join("typescript.ts");
+
+    // Create a new goldenfile mint
+    let mut mint = Mint::new(&base_path);
+    // Register the goldenfiles
+    register_goldenfile(&mut mint, &base_path, "typescript.d.ts");
+    register_goldenfile(&mut mint, &base_path, "typescript.ts");
+
+    // Generate the typescript definitions
+    tsync::generate_typescript_defs(vec![input.clone()], output1, false, true);
+    tsync::generate_typescript_defs(vec![input], output2, false, true);
+
+    // Compare the generated files to the checked-in golden files and reset the goldenfiles
+    teardown_mint(mint);
+}
+
+#[test]
+fn test_directory_input() {
+    let base_path = PathBuf::from("test/directory_input");
+    let input = base_path.join("directory");
+    let output = base_path.join("typescript.d.ts");
+
+    // Create a new goldenfile mint
+    let mut mint = Mint::new(&base_path);
+    // Register the goldenfiles
+    register_goldenfile(&mut mint, &base_path, "typescript.d.ts");
+
+    // Generate the typescript definitions
+    tsync::generate_typescript_defs(vec![input], output, false, false);
+
+    // Compare the generated files to the checked-in golden files and reset the goldenfiles
+    teardown_mint(mint);
+}
+
+#[test]
+fn test_doc_comments() {
+    let base_path = PathBuf::from("test/doc_comments");
+    let input = base_path.join("rust.rs");
+    let output1 = base_path.join("typescript.d.ts");
+    let output2 = base_path.join("typescript.ts");
+
+    // Create a new goldenfile mint
+    let mut mint = Mint::new(&base_path);
+    // Register the goldenfiles
+    register_goldenfile(&mut mint, &base_path, "typescript.d.ts");
+    register_goldenfile(&mut mint, &base_path, "typescript.ts");
+
+    // Generate the typescript definitions
+    tsync::generate_typescript_defs(vec![input.clone()], output1, false, false);
+    tsync::generate_typescript_defs(vec![input], output2, false, false);
+
+    // Compare the generated files to the checked-in golden files and reset the goldenfiles
+    teardown_mint(mint);
+}
+
+#[test]
+fn test_enum() {
+    let base_path = PathBuf::from("test/enum");
+    let input = base_path.join("rust.rs");
+    let output1 = base_path.join("typescript.d.ts");
+    let output2 = base_path.join("typescript.ts");
+
+    // Create a new goldenfile mint
+    let mut mint = Mint::new(&base_path);
+    // Register the goldenfiles
+    register_goldenfile(&mut mint, &base_path, "typescript.d.ts");
+    register_goldenfile(&mut mint, &base_path, "typescript.ts");
+
+    // Generate the typescript definitions
+    tsync::generate_typescript_defs(vec![input.clone()], output1, false, false);
+    tsync::generate_typescript_defs(vec![input], output2, false, false);
+
+    // Compare the generated files to the checked-in golden files and reset the goldenfiles
+    teardown_mint(mint);
+}
+
+#[test]
+fn test_enum_numeric() {
+    let base_path = PathBuf::from("test/enum_numeric");
+    let input = base_path.join("rust.rs");
+    let output1 = base_path.join("typescript.d.ts");
+    let output2 = base_path.join("typescript.ts");
+
+    // Create a new goldenfile mint
+    let mut mint = Mint::new(&base_path);
+    // Register the goldenfiles
+    register_goldenfile(&mut mint, &base_path, "typescript.d.ts");
+    register_goldenfile(&mut mint, &base_path, "typescript.ts");
+
+    // Generate the typescript definitions
+    tsync::generate_typescript_defs(vec![input.clone()], output1, false, false);
+    tsync::generate_typescript_defs(vec![input], output2, false, false);
+
+    // Compare the generated files to the checked-in golden files and reset the goldenfiles
+    teardown_mint(mint);
+}
+
+#[test]
+fn test_generic() {
+    let base_path = PathBuf::from("test/generic");
+    let input = base_path.join("rust.rs");
+    let output1 = base_path.join("typescript.d.ts");
+    let output2 = base_path.join("typescript.ts");
+
+    // Create a new goldenfile mint
+    let mut mint = Mint::new(&base_path);
+    // Register the goldenfiles
+    register_goldenfile(&mut mint, &base_path, "typescript.d.ts");
+    register_goldenfile(&mut mint, &base_path, "typescript.ts");
+
+    // Generate the typescript definitions
+    tsync::generate_typescript_defs(vec![input.clone()], output1, false, false);
+    tsync::generate_typescript_defs(vec![input], output2, false, false);
+
+    // Compare the generated files to the checked-in golden files and reset the goldenfiles
+    teardown_mint(mint);
+}
+
+#[test]
+fn test_struct() {
+    let base_path = PathBuf::from("test/struct");
+    let input = base_path.join("rust.rs");
+    let output1 = base_path.join("typescript.d.ts");
+    let output2 = base_path.join("typescript.ts");
+
+    // Create a new goldenfile mint
+    let mut mint = Mint::new(&base_path);
+    // Register the goldenfiles
+    register_goldenfile(&mut mint, &base_path, "typescript.d.ts");
+    register_goldenfile(&mut mint, &base_path, "typescript.ts");
+
+    // Generate the typescript definitions
+    tsync::generate_typescript_defs(vec![input.clone()], output1, false, false);
+    tsync::generate_typescript_defs(vec![input], output2, false, false);
+
+    // Compare the generated files to the checked-in golden files and reset the goldenfiles
+    teardown_mint(mint);
+}
+
+#[test]
+fn test_type() {
+    let base_path = PathBuf::from("test/type");
+    let input = base_path.join("rust.rs");
+    let output = base_path.join("typescript.d.ts");
+
+    // Create a new goldenfile mint
+    let mut mint = Mint::new(&base_path);
+    // Register the goldenfiles
+    register_goldenfile(&mut mint, &base_path, "typescript.d.ts");
+
+    // Generate the typescript definitions
+    tsync::generate_typescript_defs(vec![input], output, false, false);
+
+    // Compare the generated files to the checked-in golden files and reset the goldenfiles
+    teardown_mint(mint);
+}