LionWeb-io · dslmeinte · May 7, 2026 · May 6, 2026 · May 6, 2026
diff --git a/README.md b/README.md
@@ -90,3 +90,36 @@ By running `generate.sh` (which is equivalent to running `deno task generate-tes
 * [textualized](src/languages/testLanguage.txt), and
 * [rendered as PlantUML diagram](src/languages/testLanguage.puml).
 
+
+## Test data for serialization format validators
+
+The [`testset/`](testset) directory contains test data that can be used to test validators that validate whether serialization chunks (JSON files) conform to the serialization format specification.
+The subdirectory [`withoutLanguage/`](testset/withoutLanguage) pertains to serialization chunks that are to be validated *without* a registered language.
+The subdirectory [`withLanguage/`](testset/withLanguage) pertains to serialization chunks that are to be validated *against* a registered language — m.n. the one serialized as [`myLang.language.json`](testset/withLanguage/myLang.language.json).
+Either subdirectories contain two subdirectories named `valid` and `invalid`.
+Each (nested) subdirectory under `invalid` contains a `__TestExpectation.json` file which specifies which chunk fails validation, and if so, with which error type.
+The format of the `__TestExpectation.json` files is as follows:
+
+```json lines
+{
+  "errors": [
+    {
+      "file": "<file next to __TestExpectation.json>",
+      "error": "<error type>"
+    },
+    ...
+  ]
+}
+```
+
+Consider the following example of a member of the `errors` array:
+
+```json
+{
+  "file": "empty.json",
+  "error": "PropertyValueIncorrect"
+}
+```
+
+This means that validating the `empty.json` file is expected to produce an error of type `PropertyValueIncorrect` (and that it’s the first one produced).
+
diff --git a/testset/withLanguage/invalid/properties/boolean/__TestExpectation.json b/testset/withLanguage/invalid/properties/boolean/__TestExpectation.json
@@ -1,5 +1,4 @@
 {
-  "nodes": 12,
   "errors": [
     {
       "file": "empty.json",

diff --git a/testset/withLanguage/invalid/properties/enum/__TestExpectation.json b/testset/withLanguage/invalid/properties/enum/__TestExpectation.json
@@ -1,5 +1,4 @@
 {
-  "nodes": 12,
   "errors": [
     {
       "file": "empty.json",

diff --git a/testset/withLanguage/invalid/properties/integer/__TestExpectation.json b/testset/withLanguage/invalid/properties/integer/__TestExpectation.json
@@ -1,5 +1,4 @@
 {
-  "nodes": 12,
   "errors": [
     {
       "file": "binary.json",

diff --git a/testset/withLanguage/invalid/properties/json/__TestExpectation.json b/testset/withLanguage/invalid/properties/json/__TestExpectation.json
@@ -1,5 +1,4 @@
 {
-  "nodes": 12,
   "errors": [
     {
       "file": "empty.json",

diff --git a/testset/withoutLanguage/invalid/format/__TestExpectation.json b/testset/withoutLanguage/invalid/format/__TestExpectation.json
@@ -1,5 +1,4 @@
 {
-  "nodes": 12,
   "errors": [
     {
       "file": "additionalProperty.json",

diff --git a/testset/withoutLanguage/invalid/format/languages/__TestExpectation.json b/testset/withoutLanguage/invalid/format/languages/__TestExpectation.json
@@ -1,5 +1,4 @@
 {
-  "nodes": 12,
   "errors": [
     {
       "file": "additionalProperty.json",

diff --git a/testset/withoutLanguage/invalid/format/languages/key/__TestExpectation.json b/testset/withoutLanguage/invalid/format/languages/key/__TestExpectation.json
@@ -1,5 +1,4 @@
 {
-  "nodes": 12,
   "errors": [
     {
       "file": "empty.json",

diff --git a/testset/withoutLanguage/invalid/format/languages/version/__TestExpectation.json b/testset/withoutLanguage/invalid/format/languages/version/__TestExpectation.json
@@ -1,5 +1,4 @@
 {
-  "nodes": 12,
   "errors": [
     {
       "file": "empty.json",

diff --git a/testset/withoutLanguage/invalid/format/nodes/__TestExpectation.json b/testset/withoutLanguage/invalid/format/nodes/__TestExpectation.json
@@ -1,5 +1,4 @@
 {
-  "nodes": 12,
   "errors": [
     {
       "file": "additionalProperty.json",

diff --git a/testset/withoutLanguage/invalid/format/nodes/annotations/__TestExpectation.json b/testset/withoutLanguage/invalid/format/nodes/annotations/__TestExpectation.json
@@ -1,5 +1,4 @@
 {
-  "nodes": 12,
   "errors": [
     {
       "file": "duplicateValue.json",

diff --git a/testset/withoutLanguage/invalid/format/nodes/concept/__TestExpectation.json b/testset/withoutLanguage/invalid/format/nodes/concept/__TestExpectation.json
@@ -1,5 +1,4 @@
 {
-  "nodes": 12,
   "errors": [
     {
       "file": "additionalProperty.json",

diff --git a/testset/withoutLanguage/invalid/format/nodes/concept/key/__TestExpectation.json b/testset/withoutLanguage/invalid/format/nodes/concept/key/__TestExpectation.json
@@ -1,5 +1,4 @@
 {
-  "nodes": 12,
   "errors": [
     {
       "file": "empty.json",

diff --git a/testset/withoutLanguage/invalid/format/nodes/concept/language/__TestExpectation.json b/testset/withoutLanguage/invalid/format/nodes/concept/language/__TestExpectation.json
@@ -1,5 +1,4 @@
 {
-  "nodes": 12,
   "errors": [
     {
       "file": "empty.json",

diff --git a/testset/withoutLanguage/invalid/format/nodes/concept/version/__TestExpectation.json b/testset/withoutLanguage/invalid/format/nodes/concept/version/__TestExpectation.json
@@ -1,5 +1,4 @@
 {
-  "nodes": 12,
   "errors": [
     {
       "file": "empty.json",

diff --git a/testset/withoutLanguage/invalid/format/nodes/containments/__TestExpectation.json b/testset/withoutLanguage/invalid/format/nodes/containments/__TestExpectation.json
@@ -1,5 +1,4 @@
 {
-  "nodes": 12,
   "errors": [
     {
       "file": "additionalProperty.json",

diff --git a/testset/withoutLanguage/invalid/format/nodes/containments/children/__TestExpectation.json b/testset/withoutLanguage/invalid/format/nodes/containments/children/__TestExpectation.json
@@ -1,5 +1,4 @@
 {
-  "nodes": 12,
   "errors": [
     {
       "file": "duplicateValue.json",

diff --git a/testset/withoutLanguage/invalid/format/nodes/containments/containment/__TestExpectation.json b/testset/withoutLanguage/invalid/format/nodes/containments/containment/__TestExpectation.json
@@ -1,5 +1,4 @@
 {
-  "nodes": 12,
   "errors": [
     {
       "file": "additionalProperty.json",

diff --git a/.../withoutLanguage/invalid/format/nodes/containments/containment/key/__TestExpectation.json b/.../withoutLanguage/invalid/format/nodes/containments/containment/key/__TestExpectation.json
@@ -1,5 +1,4 @@
 {
-  "nodes": 12,
   "errors": [
     {
       "file": "empty.json",

diff --git a/...outLanguage/invalid/format/nodes/containments/containment/language/__TestExpectation.json b/...outLanguage/invalid/format/nodes/containments/containment/language/__TestExpectation.json
@@ -1,5 +1,4 @@
 {
-  "nodes": 12,
   "errors": [
     {
       "file": "empty.json",

diff --git a/...houtLanguage/invalid/format/nodes/containments/containment/version/__TestExpectation.json b/...houtLanguage/invalid/format/nodes/containments/containment/version/__TestExpectation.json
@@ -1,5 +1,4 @@
 {
-  "nodes": 12,
   "errors": [
     {
       "file": "empty.json",

diff --git a/testset/withoutLanguage/invalid/format/nodes/id/__TestExpectation.json b/testset/withoutLanguage/invalid/format/nodes/id/__TestExpectation.json
@@ -1,5 +1,4 @@
 {
-  "nodes": 12,
   "errors": [
     {
       "file": "containsDot.json",

diff --git a/testset/withoutLanguage/invalid/format/nodes/parent/__TestExpectation.json b/testset/withoutLanguage/invalid/format/nodes/parent/__TestExpectation.json
@@ -1,5 +1,4 @@
 {
-  "nodes": 12,
   "errors": [
     {
       "file": "arrayValue.json",

diff --git a/testset/withoutLanguage/invalid/format/nodes/properties/__TestExpectation.json b/testset/withoutLanguage/invalid/format/nodes/properties/__TestExpectation.json
@@ -1,5 +1,4 @@
 {
-  "nodes": 12,
   "errors": [
     {
       "file": "additionalProperty.json",

diff --git a/testset/withoutLanguage/invalid/format/nodes/properties/property/__TestExpectation.json b/testset/withoutLanguage/invalid/format/nodes/properties/property/__TestExpectation.json
@@ -1,5 +1,4 @@
 {
-  "nodes": 12,
   "errors": [
     {
       "file": "additionalProperty.json",

diff --git a/testset/withoutLanguage/invalid/format/nodes/properties/property/key/__TestExpectation.json b/testset/withoutLanguage/invalid/format/nodes/properties/property/key/__TestExpectation.json
@@ -1,5 +1,4 @@
 {
-  "nodes": 12,
   "errors": [
     {
       "file": "empty.json",

diff --git a/.../withoutLanguage/invalid/format/nodes/properties/property/language/__TestExpectation.json b/.../withoutLanguage/invalid/format/nodes/properties/property/language/__TestExpectation.json
@@ -1,5 +1,4 @@
 {
-  "nodes": 12,
   "errors": [
     {
       "file": "empty.json",

diff --git a/...t/withoutLanguage/invalid/format/nodes/properties/property/version/__TestExpectation.json b/...t/withoutLanguage/invalid/format/nodes/properties/property/version/__TestExpectation.json
@@ -1,5 +1,4 @@
 {
-  "nodes": 12,
   "errors": [
     {
       "file": "empty.json",

diff --git a/testset/withoutLanguage/invalid/format/nodes/references/__TestExpectation.json b/testset/withoutLanguage/invalid/format/nodes/references/__TestExpectation.json
@@ -1,5 +1,4 @@
 {
-  "nodes": 12,
   "errors": [
     {
       "file": "additionalProperty.json",

diff --git a/testset/withoutLanguage/invalid/format/nodes/references/reference/__TestExpectation.json b/testset/withoutLanguage/invalid/format/nodes/references/reference/__TestExpectation.json
@@ -1,5 +1,4 @@
 {
-  "nodes": 12,
   "errors": [
     {
       "file": "additionalProperty.json",

diff --git a/testset/withoutLanguage/invalid/format/nodes/references/reference/key/__TestExpectation.json b/testset/withoutLanguage/invalid/format/nodes/references/reference/key/__TestExpectation.json
@@ -1,5 +1,4 @@
 {
-  "nodes": 12,
   "errors": [
     {
       "file": "empty.json",

diff --git a/...withoutLanguage/invalid/format/nodes/references/reference/language/__TestExpectation.json b/...withoutLanguage/invalid/format/nodes/references/reference/language/__TestExpectation.json
@@ -1,5 +1,4 @@
 {
-  "nodes": 12,
   "errors": [
     {
       "file": "empty.json",

diff --git a/.../withoutLanguage/invalid/format/nodes/references/reference/version/__TestExpectation.json b/.../withoutLanguage/invalid/format/nodes/references/reference/version/__TestExpectation.json
@@ -1,5 +1,4 @@
 {
-  "nodes": 12,
   "errors": [
     {
       "file": "empty.json",

diff --git a/testset/withoutLanguage/invalid/format/nodes/references/targets/__TestExpectation.json b/testset/withoutLanguage/invalid/format/nodes/references/targets/__TestExpectation.json
@@ -1,5 +1,4 @@
 {
-  "nodes": 12,
   "errors": [
     {
       "file": "additionalProperty.json",

diff --git a/.../withoutLanguage/invalid/format/nodes/references/targets/reference/__TestExpectation.json b/.../withoutLanguage/invalid/format/nodes/references/targets/reference/__TestExpectation.json
@@ -1,5 +1,4 @@
 {
-  "nodes": 12,
   "errors": [
     {
       "file": "arrayValue.json",

diff --git a/...ithoutLanguage/invalid/format/nodes/references/targets/resolveInfo/__TestExpectation.json b/...ithoutLanguage/invalid/format/nodes/references/targets/resolveInfo/__TestExpectation.json
@@ -1,5 +1,4 @@
 {
-  "nodes": 12,
   "errors": [
     {
       "file": "arrayValue.json",

diff --git a/testset/withoutLanguage/invalid/format/serializationFormatVersion/__TestExpectation.json b/testset/withoutLanguage/invalid/format/serializationFormatVersion/__TestExpectation.json
@@ -1,5 +1,4 @@
 {
-  "nodes": 12,
   "errors": [
     {
       "file": "emptyString.json",

diff --git a/testset/withoutLanguage/invalid/idFormat/id/__TestExpectation.json b/testset/withoutLanguage/invalid/idFormat/id/__TestExpectation.json
@@ -1,5 +1,4 @@
 {
-  "nodes": 12,
   "errors": [
     {
       "file": "ampersand.json",

diff --git a/testset/withoutLanguage/invalid/idFormat/key/__TestExpectation.json b/testset/withoutLanguage/invalid/idFormat/key/__TestExpectation.json
@@ -1,5 +1,4 @@
 {
-  "nodes": 12,
   "errors": [
     {
       "file": "ampersand.json",

diff --git a/testset/withoutLanguage/invalid/idFormat/language/__TestExpectation.json b/testset/withoutLanguage/invalid/idFormat/language/__TestExpectation.json
@@ -1,5 +1,4 @@
 {
-  "nodes": 12,
   "errors": [
     {
       "file": "ampersand.json",

diff --git a/testset/withoutLanguage/invalid/tree/__TestExpectation.json b/testset/withoutLanguage/invalid/tree/__TestExpectation.json
@@ -1,5 +1,4 @@
 {
-  "nodes": 12,
   "errors": [
     {
       "file": "selfParent.json",

diff --git a/testset/withoutLanguage/invalid/tree/annotation/__TestExpectation.json b/testset/withoutLanguage/invalid/tree/annotation/__TestExpectation.json
@@ -1,5 +1,4 @@
 {
-  "nodes": 12,
   "errors": [
     {
       "file": "directCircleA.json",

diff --git a/testset/withoutLanguage/invalid/tree/containment/__TestExpectation.json b/testset/withoutLanguage/invalid/tree/containment/__TestExpectation.json
@@ -1,5 +1,4 @@
 {
-  "nodes": 12,
   "errors": [
     {
       "file": "directCircleA.json",

diff --git a/testset/withoutLanguage/invalid/tree/mixed/__TestExpectation.json b/testset/withoutLanguage/invalid/tree/mixed/__TestExpectation.json
@@ -1,5 +1,4 @@
 {
-  "nodes": 12,
   "errors": [
     {
       "file": "directCircleA.json",

diff --git a/testset/withoutLanguage/invalid/usedLanguages/concept/__TestExpectation.json b/testset/withoutLanguage/invalid/usedLanguages/concept/__TestExpectation.json
@@ -1,5 +1,4 @@
 {
-  "nodes": 12,
   "errors": [
     {
       "file": "key.json",

diff --git a/testset/withoutLanguage/invalid/usedLanguages/containment/__TestExpectation.json b/testset/withoutLanguage/invalid/usedLanguages/containment/__TestExpectation.json
@@ -1,5 +1,4 @@
 {
-  "nodes": 12,
   "errors": [
     {
       "file": "key.json",

diff --git a/testset/withoutLanguage/invalid/usedLanguages/property/__TestExpectation.json b/testset/withoutLanguage/invalid/usedLanguages/property/__TestExpectation.json
@@ -1,5 +1,4 @@
 {
-  "nodes": 12,
   "errors": [
     {
       "file": "key.json",

diff --git a/testset/withoutLanguage/invalid/usedLanguages/reference/__TestExpectation.json b/testset/withoutLanguage/invalid/usedLanguages/reference/__TestExpectation.json
@@ -1,5 +1,4 @@
 {
-  "nodes": 12,
   "errors": [
     {
       "file": "key.json",