From 2e39ef952b44b8bc108f9e12de7a3ab165d21315 Mon Sep 17 00:00:00 2001
From: Simon Bruder <simon@sbruder.de>
Date: Sat, 27 Jul 2024 20:45:17 +0200
Subject: [PATCH] Add testing infrastructure

---
 .forgejo/workflows/build.yaml |  2 +-
 .gitignore                    |  1 +
 .tarpaulin.toml               | 16 ++++++++
 flake.nix                     | 74 ++++++++++++++++++++++++++++-------
 4 files changed, 78 insertions(+), 15 deletions(-)
 create mode 100644 .tarpaulin.toml

diff --git a/.forgejo/workflows/build.yaml b/.forgejo/workflows/build.yaml
index e8a7d12..a086796 100644
--- a/.forgejo/workflows/build.yaml
+++ b/.forgejo/workflows/build.yaml
@@ -20,7 +20,7 @@ jobs:
           git config --unset "http.${GITHUB_SERVER_URL}/.extraHeader"
           git lfs install --local
           git lfs pull
-      - name: Build
+      - name: Build and test
         run: nix build -L .#li7y .#li7y-oci
       - name: Push OCI image
         if: github.ref == 'refs/heads/master'
diff --git a/.gitignore b/.gitignore
index 2ac9df7..f885903 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,5 +3,6 @@
 # SPDX-License-Identifier: AGPL-3.0-or-later
 
 /target
+/.tarpaulin_target
 result*
 .pre-commit-config.yaml
diff --git a/.tarpaulin.toml b/.tarpaulin.toml
new file mode 100644
index 0000000..9d116e5
--- /dev/null
+++ b/.tarpaulin.toml
@@ -0,0 +1,16 @@
+# SPDX-FileCopyrightText: 2024 Simon Bruder <simon@sbruder.de>
+#
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
+[default]
+# Tarpaulin uses custom options
+# that are incompatible with the default options.
+# This sets a different target directory,
+# so the files from tarpaulin do not interfere with the regular outputs.
+target-dir = ".tarpaulin_target"
+# Do not recompile everything on every run
+skip-clean = true
+
+[report]
+out = ["Html"]
+output-dir = "target/tarpaulin"
diff --git a/flake.nix b/flake.nix
index b7a2d7f..60b6756 100644
--- a/flake.nix
+++ b/flake.nix
@@ -74,31 +74,77 @@
         };
       };
 
-      packages = rec {
-        li7y = naersk'.buildPackage {
-          src = self;
-        };
-        default = li7y;
+      packages =
+        let
+          # naersk does not easily allow overrideAttrs
+          commonNaerskConfigurarion = {
+            src = self;
 
-        li7y-oci = pkgs.dockerTools.buildLayeredImage {
-          name = "li7y";
-          tag = "latest";
+            checkInputs = with pkgs; [
+              postgresql
+              postgresqlTestHook
+            ];
 
-          contents = [
-            li7y
-          ];
+            # otherwise the deps derivation is also tested (which just wastes time as there are no tests)
+            overrideMain = (o: o // {
+              doCheck = true;
+            });
 
-          config = {
-            Cmd = [ "${li7y}/bin/li7y" ];
+            # tests need to be able to create and drop databases
+            postgresqlTestUserOptions = "LOGIN SUPERUSER";
+
+            postgresqlTestSetupPost = ''
+              export DATABASE_URL="postgres://''${PGUSER}/''${PGDATABASE}?port=5432&host=''${PGHOST}"
+            '';
+
+            # Otherwise SQLx tries to infer the databse schema from an empty database
+            # (as it can only run the migrations once the test binary is built).
+            # Also, this enforces that the full query cache is included in the repository.
+            SQLX_OFFLINE = true;
+          };
+        in
+        rec {
+          li7y = naersk'.buildPackage commonNaerskConfigurarion;
+          default = li7y;
+
+          li7y-tarpaulin = naersk'.buildPackage (commonNaerskConfigurarion // {
+            name = "li7y-tarpaulin";
+
+            checkInputs = commonNaerskConfigurarion.checkInputs ++ (with pkgs; [
+              cargo-tarpaulin
+            ]);
+
+            dontBuild = true;
+            singleStep = true; # tarpaulin uses different options anyway
+
+            cargoTestCommands = _: [ "cargo tarpaulin" ];
+
+            postInstall = ''
+              rm -r $out
+              cp -r target/tarpaulin $out
+            '';
+          });
+
+          li7y-oci = pkgs.dockerTools.buildLayeredImage {
+            name = "li7y";
+            tag = "latest";
+
+            contents = [
+              li7y
+            ];
+
+            config = {
+              Cmd = [ "${li7y}/bin/li7y" ];
+            };
           };
         };
-      };
 
       devShells.default = pkgs.mkShell {
         buildInputs = [
           rustPackageDev
         ] ++ (with pkgs; [
           cargo-deny
+          cargo-tarpaulin
           cargo-watch
           clippy
           graphviz