Add systematic tests to mg7

.github/actions/build_madspace/action.yml

@@ -0,0 +1,50 @@
+name: Build madspace
+description: >
+  Build the madspace install prefix once per commit and cache it
+  (content-addressed on the madspace source). Shared by the build_madspace job
+  of every mg7 workflow so the build logic lives in exactly one place. Test jobs
+  restore the result with the install_madspace action (they must `needs:` the
+  job that runs this action). Assumes the repository is already checked out.
+
+runs:
+  using: composite
+  steps:
+    # Cache key must match the one used by the install_madspace action exactly,
+    # otherwise the later restore misses.
+    - name: madspace cache key
+      run: echo "MS_PY=$(python3 -c 'import sys;print(f"{sys.version_info.major}{sys.version_info.minor}")')" >> $GITHUB_ENV
+      shell: bash
+
+    # Cache the installed madspace/install prefix directly (not just a wheel), so
+    # every test job restores a ready-to-use install and skips pip entirely.
+    # hashFiles is evaluated before the build step creates madspace/install, so
+    # the key is the clean-source hash and matches the install_madspace action.
+    - name: Cache madspace install
+      id: cache-madspace
+      uses: actions/cache@v5
+      with:
+        path: madspace/install
+        key: madspace-${{ runner.os }}-py${{ env.MS_PY }}-${{ hashFiles('madspace/**') }}
+
+    # Built from the in-tree source (scikit-build-core / cmake). Upgrade pip +
+    # packaging first: the runner ships an ancient pip whose build isolation does
+    # not provide packaging>=22, which scikit-build-core's vendored
+    # pyproject_metadata requires.
+    #
+    # ENABLE_OPENBLAS=ON builds OpenBLAS from source and links it statically into
+    # the extension (see madspace/CMakeLists.txt), so the cached install is
+    # self-contained and needs no system libopenblas at runtime. This avoids a
+    # dynamic dependency that would otherwise only be satisfied on cache miss
+    # (when apt installed libopenblas-dev) and missing on cache hit.
+    #
+    # --target installs into madspace/install, the prefix the mg7 runtime and
+    # madspace/install.py expect.
+    - name: Build and install madspace (only on cache miss)
+      if: steps.cache-madspace.outputs.cache-hit != 'true'
+      run: |
+        cd $GITHUB_WORKSPACE
+        python3 -m pip install --upgrade pip packaging
+        python3 -m pip install ./madspace \
+          -Ccmake.define.ENABLE_OPENBLAS=ON \
+          --target="$GITHUB_WORKSPACE/madspace/install"
+      shell: bash

.github/actions/install_lhapdf_pdfset/action.yml

@@ -0,0 +1,45 @@
+name: Install LHAPDF PDF set
+description: >
+  Make an LHAPDF PDF grid available to the mg7 (madspace) runtime and export
+  LHAPDF_DATA_PATH so it is found. The mg7 runtime reads the grid file directly
+  (mg7/madevent.py: ms.PdfGrid on $LHAPDF_DATA_PATH/<set>/<set>_0000.dat), so it
+  only needs the grid data -- not the LHAPDF C++ library and not a pre-baked
+  HEPTools cache. The set is installed with the lhapdf-management pip package
+  into a cached, writable directory, so the download happens at most once.
+
+inputs:
+  pdfset:
+    description: Name of the LHAPDF set to install
+    required: false
+    default: NNPDF23_lo_as_0130_qed
+
+runs:
+  using: composite
+  steps:
+    # Writable data dir, exported so every later step (and the tests) resolve the
+    # grid via $LHAPDF_DATA_PATH. GITHUB_ENV persists to subsequent steps,
+    # including the install step below.
+    - name: Set LHAPDF_DATA_PATH
+      shell: bash
+      run: echo "LHAPDF_DATA_PATH=$HOME/.cache/lhapdf_data" >> "$GITHUB_ENV"
+
+    # Cache the downloaded grid (~26 MB for NNPDF23) so we only hit the CERN
+    # server on the first run for a given set.
+    - name: Cache PDF grid
+      id: cache-pdf
+      uses: actions/cache@v5
+      with:
+        path: ~/.cache/lhapdf_data
+        key: lhapdf-data-${{ inputs.pdfset }}
+
+    # lhapdf-management honours $LHAPDF_DATA_PATH (set above) as the install
+    # location. `update --init` creates the data dir and pulls the set index;
+    # `install` downloads and unpacks the grid.
+    - name: Install PDF set via lhapdf-management (on cache miss)
+      if: steps.cache-pdf.outputs.cache-hit != 'true'
+      shell: bash
+      run: |
+        python3 -m pip install lhapdf-management
+        mkdir -p "$LHAPDF_DATA_PATH"
+        lhapdf-management update --init
+        lhapdf-management install "${{ inputs.pdfset }}"

.github/workflows/acceptancetest_mg7.yml

@@ -30,55 +30,19 @@ concurrency:
 
 # A workflow run is made up of one or more jobs that can run sequentially or in parallel
 jobs:
-  # Build the madspace wheel exactly once per workflow run. The wheel is cached
-  # with a content-addressed key (hash of the madspace sources), so it is only
-  # rebuilt when madspace actually changes and is never shared between differing
-  # builds. Every test job below depends on this job (needs: build_madspace) and
-  # installs the cached wheel via the install_madspace action instead of
-  # recompiling the C++/CUDA extension itself.
+  # Build the madspace install exactly once per workflow run. It is cached with a
+  # content-addressed key (hash of the madspace sources), so it is only rebuilt
+  # when madspace actually changes and is never shared between differing builds.
+  # Every test job below depends on this job (needs: build_madspace) and restores
+  # the cached install via the install_madspace action instead of recompiling the
+  # C++/CUDA extension itself. The build logic lives in the build_madspace
+  # composite action so it stays in sync with check_xsec_processes_mg7.yml.
   build_madspace:
     runs-on: ubuntu-24.04
     if: github.event_name == 'push' || github.event.pull_request.head.repo.fork == true
     steps:
       - uses: actions/checkout@v4
-
-      - name: madspace cache key
-        run: echo "MS_PY=$(python3 -c 'import sys;print(f"{sys.version_info.major}{sys.version_info.minor}")')" >> $GITHUB_ENV
-        shell: bash
-
-      # Cache the installed madspace/install prefix directly (not just a wheel),
-      # so every test job restores a ready-to-use install and skips pip entirely.
-      # hashFiles is evaluated before the build step creates madspace/install, so
-      # the key is the clean-source hash and matches the install_madspace action.
-      - name: Cache madspace install
-        id: cache-madspace
-        uses: actions/cache@v5
-        with:
-          path: madspace/install
-          key: madspace-${{ runner.os }}-py${{ env.MS_PY }}-${{ hashFiles('madspace/**') }}
-
-      # Built from the in-tree source (scikit-build-core / cmake). Upgrade pip +
-      # packaging first: the runner ships an ancient pip whose build isolation
-      # does not provide packaging>=22, which scikit-build-core's vendored
-      # pyproject_metadata requires.
-      #
-      # ENABLE_OPENBLAS=ON builds OpenBLAS from source and links it statically
-      # into the extension (see madspace/CMakeLists.txt), so the cached install
-      # is self-contained and needs no system libopenblas at runtime. This avoids
-      # a dynamic dependency that would otherwise only be satisfied on cache miss
-      # (when apt installed libopenblas-dev) and missing on cache hit.
-      #
-      # --target installs into madspace/install, the prefix the mg7 runtime and
-      # madspace/install.py expect.
-      - name: Build and install madspace (only on cache miss)
-        if: steps.cache-madspace.outputs.cache-hit != 'true'
-        run: |
-          cd $GITHUB_WORKSPACE
-          python3 -m pip install --upgrade pip packaging
-          python3 -m pip install ./madspace \
-            -Ccmake.define.ENABLE_OPENBLAS=ON \
-            --target="$GITHUB_WORKSPACE/madspace/install"
-        shell: bash
+      - uses: ./.github/actions/build_madspace
 
   acceptancetest_mg7_ufo_aloha:
     needs: build_madspace

.github/workflows/check_xsec_processes_mg7.yml

@@ -0,0 +1,83 @@
+name: systematic cross-section tests (mg7)
+
+# Regression test that MadGraph7 reproduces the reference cross-sections
+# recorded in tests/acceptance_tests/check_xsec_processes_reference.json.
+#
+# The tests live in the test_manager.py framework
+# (tests/acceptance_tests/test_check_xsec_processes_mg7.py): one
+# unittest.TestCase with a test_<section>_<id>_mg7 method per process. This
+# workflow launches them through test_manager.py, one job per section, so the
+# exact same tests can also be run locally, e.g.
+#     ./tests/test_manager.py test_ttx_decay_.*_mg7 -pA -t0
+#
+# For every process the framework generates it, runs the mg7 (madspace)
+# integrator with the run_card.toml defaults (fixed scale mu = 91.188 GeV,
+# e_cm = 13000 GeV, NNPDF23_lo_as_0130_qed) and compares the resulting
+# cross-section to the reference. A run passes only if the relative difference
+# stays below `tolerance` for every process in the section.
+
+on:
+  push:
+    paths-ignore:
+      - 'docs/**'
+#      - '.github/**'
+
+  pull_request:
+    types: [opened, synchronize, reopened]
+
+  # Allows you to run this workflow manually from the Actions tab
+  workflow_dispatch:
+    inputs:
+      message:
+        description: 'running cross section check test'
+        required: true
+      tolerance:
+        description: 'Max allowed relative difference (e.g. 0.01 = 1%)'
+        required: false
+        default: '0.01'
+      events:
+        description: 'Events per process (reference used 1M; reduced here for CI)'
+        required: false
+        default: '100000'
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+env:
+  # Read by tests/acceptance_tests/test_check_xsec_processes_mg7.py. The
+  # `|| 'default'` fallback covers push/PR triggers where inputs are absent.
+  MG7_XSEC_TOLERANCE: ${{ inputs.tolerance || '0.01' }}
+  MG7_XSEC_EVENTS: ${{ inputs.events || '100000' }}
+  FORCE_JAVASCRIPT_ACTIONS_TO_NODE24: "true"
+
+jobs:
+  # Build madspace once (content-addressed cache), shared by every section job.
+  # The build logic lives in the build_madspace composite action so it stays in
+  # sync with acceptancetest_mg7.yml.
+  build_madspace:
+    runs-on: ubuntu-24.04
+    steps:
+      - uses: actions/checkout@v4
+      - uses: ./.github/actions/build_madspace
+
+  check_xsec_processes:
+    needs: build_madspace
+    runs-on: ubuntu-24.04
+    strategy:
+      fail-fast: false
+      matrix:
+        # Each job runs every process in the selected section and fails if any
+        # process exceeds the tolerance.
+        section: [3jets, ttx1j, ttx2j, ttx_decay, dy1j, dy2j]
+    steps:
+      - uses: actions/checkout@v4
+      - uses: ./.github/actions/checkout_mg5
+      - uses: ./.github/actions/install_madspace
+      - uses: ./.github/actions/restore-pip-cache
+      # Provides the NNPDF23 grid + LHAPDF_DATA_PATH the mg7 runtime needs.
+      - uses: ./.github/actions/install_lhapdf_pdfset
+      - name: run systematic cross-section test (${{ matrix.section }})
+        run: |
+          cd $GITHUB_WORKSPACE
+          ./tests/test_manager.py "test_${{ matrix.section }}_.*_mg7" -pA -t0 -l INFO

tests/acceptance_tests/check_xsec_processes_reference.json

@@ -0,0 +1,58 @@
+{
+  "_comment": "Reference cross-sections (pb) for systematic MG7 testing. Source of truth: #28. Reference runs used fixed scale (mu = 91.188 GeV, the run_card.toml default), e_cm = 13000 GeV, NNPDF23_lo_as_0130_qed, 1M events.",
+  "defines": [],
+  "sections": {
+    "3jets": [
+      {"id": "ppjjj",              "process": "p p > j j j",                                        "cross": 4.639e+07, "error": 1.323e+04},
+      {"id": "ggggg",             "process": "g g > g g g",                                        "cross": 2.439e+07, "error": 7044},
+      {"id": "gg_g_q_qbar",       "process": "g g > g _quark _anti_quark",                         "cross": 2.143e+06, "error": 849.2},
+      {"id": "gq_ggq",            "process": "g _quark > g g _quark",                              "cross": 6.264e+06, "error": 1676},
+      {"id": "gq_qqqbar",         "process": "g _quark > _quark _quark _anti_quark",               "cross": 2.589e+05, "error": 91.76},
+      {"id": "gqbar_ggqbar",      "process": "g _anti_quark > g g _anti_quark",                    "cross": 2.197e+06, "error": 639.1},
+      {"id": "gqbar_qqbarqbar",   "process": "g _anti_quark > _quark _anti_quark _anti_quark",     "cross": 9.63e+04, "error": 34.19},
+      {"id": "qq_gqq",            "process": "_quark _quark > g _quark _quark",                    "cross": 1.047e+06, "error": 273.6},
+      {"id": "qqbar_ggg",         "process": "_quark _anti_quark > g g g",                         "cross": 5944, "error": 2.437},
+      {"id": "qqbar_gqqbar",      "process": "_quark _anti_quark > g _quark _anti_quark",          "cross": 5.26e+05, "error": 142.7},
+      {"id": "qbarqbar_gqbarqbar","process": "_anti_quark _anti_quark > g _anti_quark _anti_quark","cross": 1.916e+05, "error": 59.33}
+    ],
+    "ttx1j": [
+      {"id": "pp_ttxj",     "process": "p p > t t~ j",                     "cross": 994,    "error": 0.276},
+      {"id": "gg_ttxg",     "process": "g g > t t~ g",                     "cross": 723.5,  "error": 0.2165},
+      {"id": "gq_ttxq",     "process": "g _quark > t t~ _quark",           "cross": 98.74,  "error": 0.02542},
+      {"id": "gqbar_ttxqbar","process": "g _anti_quark > t t~ _anti_quark","cross": 20.06,  "error": 0.004919},
+      {"id": "qqbar_ttxg",  "process": "_quark _anti_quark > t t~ g",      "cross": 17.04,  "error": 0.00451}
+    ],
+    "ttx2j": [
+      {"id": "pp_ttxjj",              "process": "p p > t t~ j j",                                 "cross": 906.4, "error": 0.2643},
+      {"id": "gg_ttxgg",              "process": "g g > t t~ g g",                                 "cross": 546,   "error": 0.1632},
+      {"id": "gg_ttxqqbar",           "process": "g g > t t~ _quark _anti_quark",                  "cross": 17.92, "error": 0.005483},
+      {"id": "gq_ttxgq",              "process": "g _quark > t t~ g _quark",                       "cross": 130.9, "error": 0.03545},
+      {"id": "gqbar_ttxgqbar",        "process": "g _anti_quark > t t~ g _anti_quark",             "cross": 22.1,  "error": 0.006179},
+      {"id": "qq_ttxqq",              "process": "_quark _quark > t t~ _quark _quark",             "cross": 15.37, "error": 0.004464},
+      {"id": "qqbar_ttxgg",           "process": "_quark _anti_quark > t t~ g g",                  "cross": 5.944, "error": 0.002005},
+      {"id": "qqbar_ttxqqbar",        "process": "_quark _anti_quark > t t~ _quark _anti_quark",   "cross": 3.595, "error": 0.001049},
+      {"id": "qbarqbar_ttxqbarqbar",  "process": "_anti_quark _anti_quark > t t~ _anti_quark _anti_quark", "cross": 0.5119, "error": 0.0001495}
+    ],
+    "ttx_decay": [
+      {"id": "pp_had",    "process": "p p > t t~, ( t > W+ b, W+ > j j), ( t~ > W- b~, W- > j j)", "cross": 291.7, "error": 0.06962, "disable_jet_cuts": true},
+      {"id": "gg_had",    "process": "g g > t t~, ( t > W+ b, W+ > _quark _anti_quark), ( t~ > W- b~, W- > _quark _anti_quark)", "cross": 257.7, "error": 0.05345, "disable_jet_cuts": true},
+      {"id": "qqbar_had", "process": "_quark _anti_quark > t t~, ( t > W+ b, W+ > _quark _anti_quark), ( t~ > W- b~, W- > _quark _anti_quark)", "cross": 16.98, "error": 0.002692, "disable_jet_cuts": true}
+    ],
+    "dy1j": [
+      {"id": "pp_eej",      "process": "p p > e+ e- j",                    "cross": 257.5, "error": 0.08979},
+      {"id": "gq_eeq",      "process": "g _quark > e+ e- _quark",          "cross": 58.97, "error": 0.02517},
+      {"id": "gqbar_eeqbar","process": "g _anti_quark > e+ e- _anti_quark","cross": 37.47, "error": 0.01296},
+      {"id": "qqbar_eeg",   "process": "_quark _anti_quark > e+ e- g",     "cross": 32.35, "error": 0.009621}
+    ],
+    "dy2j": [
+      {"id": "pp_eejj",              "process": "p p > e+ e- j j",                                  "cross": 116.1, "error": 0.0377},
+      {"id": "gg_eeqqbar",          "process": "g g > e+ e- _quark _anti_quark",                   "cross": 8.62,  "error": 0.003529},
+      {"id": "gq_eegq",             "process": "g _quark > e+ e- g _quark",                        "cross": 27.32, "error": 0.008703},
+      {"id": "gqbar_eegqbar",       "process": "g _anti_quark > e+ e- g _anti_quark",              "cross": 13.64, "error": 0.004341},
+      {"id": "qq_eeqq",             "process": "_quark _quark > e+ e- _quark _quark",              "cross": 7.566, "error": 0.001927},
+      {"id": "qqbar_eegg",          "process": "_quark _anti_quark > e+ e- g g",                   "cross": 3.95,  "error": 0.001233},
+      {"id": "qqbar_eeqqbar",       "process": "_quark _anti_quark > e+ e- _quark _anti_quark",    "cross": 4.407, "error": 0.001189},
+      {"id": "qbarqbar_eeqbarqbar", "process": "_anti_quark _anti_quark > e+ e- _anti_quark _anti_quark", "cross": 1.467, "error": 0.0004163}
+    ]
+  }
+}