toml: add 1MB file parsing test to CI (#12582)

Author: larpon

.github/workflows/toml_ci.yml

@@ -36,3 +36,9 @@ jobs:
 
       - name: Run BurntSushi TOML tests
         run: ./v vlib/toml/tests/burntsushi.toml-test_test.v
+
+      - name: Get large_toml_file_test.toml
+        run: wget https://gist.githubusercontent.com/Larpon/89b0e3d94c6903851ff15559e5df7a05/raw/62a1f87a4e37bf157f2e0bfb32d85d840c98e422/large_toml_file_test.toml -O vlib/toml/tests/testdata/large_toml_file_test.toml
+
+      - name: Run large TOML file tests
+        run: ./v vlib/toml/tests/large_toml_file_test.v

vlib/toml/tests/large_toml_file_test.v

@@ -0,0 +1,21 @@
+import os
+import toml
+
+// Instructions for developers:
+// The large (1MB) TOML file can be obtained by doing:
+// `cd vlib/toml/tests/testdata`
+// `wget https://gist.githubusercontent.com/Larpon/89b0e3d94c6903851ff15559e5df7a05/raw/62a1f87a4e37bf157f2e0bfb32d85d840c98e422/large_toml_file_test.toml`
+
+// See also the CI toml tests
+
+// test_large_file parser 'testdata/large_toml_file_test.toml' if found.
+fn test_large_file() {
+	toml_file :=
+		os.real_path(os.join_path(os.dir(@FILE), 'testdata', os.file_name(@FILE).all_before_last('.'))) +
+		'.toml'
+	if os.exists(toml_file) {
+		println('Testing parsing of large (${os.file_size(toml_file)} bytes) "$toml_file"...')
+		toml_doc := toml.parse(toml_file) or { panic(err) }
+		println('OK   [1/1] "$toml_file"...') // So it can be checked with `v -stats test ...`
+	}
+}