Add more random generator test coverage and use elm-pages for random generator

test/property-test/.gitignore

@@ -3,6 +3,9 @@ generated/
 .elm-pages/
 elm-stuff/
 script/elm-stuff/
+script/.elm-pages/
+script/.coverage/
+script/coverage/
 review/elm-stuff/
 codegen/Gen/
 package-lock.json

test/property-test/README.md

@@ -0,0 +1,29 @@
+# Property Tests
+
+Random program generator for elm-codegen. Generates random Elm files using elm-codegen's API, compiles them with `elm make`, and runs `elm-review` to catch bugs.
+
+## Quick start
+
+```sh
+cd test/property-test
+npm install
+SEED=42 COUNT=10 bash run.sh
+```
+
+## Running the generator directly
+
+```sh
+cd test/property-test/script
+npx elm-pages run src/GenerateProgram.elm -- --seed 42 --count 20
+```
+
+## Code coverage
+
+The `--coverage-include ../../../src` flag limits instrumentation to elm-codegen's own source. Without it, the report includes the generator itself and generated codegen helpers (`Gen.*` modules), which are all 0% and dilute the coverage numbers.
+
+```sh
+cd test/property-test/script
+npx elm-pages run --coverage --coverage-include ../../../src src/GenerateProgram.elm -- --seed 42 --count 10
+```
+
+Coverage output is written to `script/coverage/lcov.info`.

test/property-test/package.json

@@ -3,13 +3,14 @@
   "type": "module",
   "private": true,
   "scripts": {
-    "generate": "node generate.mjs",
+    "generate": "cd script && npx elm-pages run src/GenerateProgram.elm",
     "test": "node harness.mjs",
     "property-test": "sh run.sh"
   },
   "devDependencies": {
     "elm": "^0.19.1-6",
     "elm-codegen": "^0.6.3",
+    "elm-pages": "^3.3.4",
     "elm-review": "^2.12.0"
   }
 }

test/property-test/run.sh

@@ -10,18 +10,6 @@ echo "=== elm-codegen Property Tests ==="
 echo "Seed: $SEED  Count: $COUNT"
 echo ""
 
-# Install npm deps if needed
-if [ ! -d "node_modules" ]; then
-    echo "Installing dependencies..."
-    npm install
-fi
-
-# Generate codegen helpers if needed
-if [ ! -d "codegen/Gen" ]; then
-    echo "Generating codegen helpers..."
-    npx elm-codegen install
-fi
-
 # Clean previous generated files, preserve elm.json
 rm -rf generated/src generated/manifest.json generated/elm-stuff
 mkdir -p generated/src
@@ -50,9 +38,11 @@ if [ ! -f "generated/elm.json" ]; then
 ELMJSON
 fi
 
-# Generate programs
+# Generate programs using elm-pages script
 echo "Generating $COUNT test programs with seed $SEED..."
-node generate.mjs --seed "$SEED" --count "$COUNT"
+cd script
+npx elm-pages run src/GenerateProgram.elm -- --seed "$SEED" --count "$COUNT"
+cd ..
 echo ""
 
 # Run the harness (compile + elm-review)

test/property-test/script/elm-pages.config.mjs

@@ -0,0 +1 @@
+export default {};

test/property-test/script/elm.json

@@ -8,6 +8,8 @@
     "elm-version": "0.19.1",
     "dependencies": {
         "direct": {
+            "dillonkearns/elm-cli-options-parser": "5.0.1",
+            "dillonkearns/elm-pages": "12.1.2",
             "elm/core": "1.0.5",
             "elm/json": "1.1.4",
             "elm/random": "1.0.0",
@@ -16,9 +18,44 @@
             "the-sett/elm-pretty-printer": "3.3.1"
         },
         "indirect": {
+            "Chadtech/elm-bool-extra": "2.4.2",
+            "MaybeJustJames/yaml": "2.1.7",
+            "avh4/elm-color": "1.0.0",
+            "danyx23/elm-mimetype": "4.0.1",
+            "dillonkearns/elm-bcp47-language-tag": "2.0.0",
+            "dillonkearns/elm-date-or-date-time": "2.0.0",
+            "dillonkearns/elm-form": "3.1.0",
+            "dillonkearns/elm-ts-json": "2.1.2",
+            "elm/browser": "1.0.2",
+            "elm/bytes": "1.0.8",
+            "elm/file": "1.0.5",
+            "elm/html": "1.0.1",
+            "elm/http": "2.0.0",
             "elm/parser": "1.1.0",
+            "elm/regex": "1.0.0",
             "elm/time": "1.0.0",
-            "stil4m/structured-writer": "1.0.3"
+            "elm/url": "1.0.0",
+            "elm/virtual-dom": "1.0.5",
+            "elm-community/dict-extra": "2.4.0",
+            "elm-community/list-extra": "8.7.0",
+            "elm-explorations/test": "2.2.1",
+            "elmcraft/core-extra": "2.3.0",
+            "fredcy/elm-parseint": "2.0.1",
+            "jluckyiv/elm-utc-date-strings": "1.0.0",
+            "justinmimbs/date": "4.1.0",
+            "mdgriffith/elm-codegen": "6.0.2",
+            "miniBill/elm-codec": "2.3.0",
+            "miniBill/elm-unicode": "1.1.1",
+            "noahzgordon/elm-color-extra": "1.0.2",
+            "pithub/elm-parser-bug-workaround": "1.0.0",
+            "pithub/elm-parser-extra": "1.0.0",
+            "robinheghan/fnv1a": "1.0.0",
+            "robinheghan/murmur3": "1.0.0",
+            "rtfeldman/elm-css": "18.0.0",
+            "rtfeldman/elm-iso8601-date-strings": "1.1.4",
+            "stil4m/structured-writer": "1.0.3",
+            "the-sett/elm-syntax-dsl": "6.0.5",
+            "wolfadex/elm-ansi": "3.0.1"
         }
     },
     "test-dependencies": {