(new test bsb) Test deprecation of top-level suffix field

Author: ELLIOTTCABLE

jscomp/build_tests/deprecated_bs_suffix/.gitignore

@@ -0,0 +1,26 @@
+*.exe
+*.obj
+*.out
+*.compile
+*.native
+*.byte
+*.cmo
+*.annot
+*.cmi
+*.cmx
+*.cmt
+*.cmti
+*.cma
+*.a
+*.cmxa
+*.obj
+*~
+*.annot
+*.cmj
+*.bak
+lib/bs
+*.mlast
+*.mliast
+.vscode
+.merlin
+**/*.bs.js

jscomp/build_tests/deprecated_bs_suffix/bsconfig.json

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+{
+  "name": "x",
+  "sources": ".",
+  "package-specs": [
+    {
+      "module": "commonjs",
+      "in-source": true
+    }
+  ],
+  "suffix": ".bs.js"
+}

jscomp/build_tests/deprecated_bs_suffix/demo.ml

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+let str = "Hello, world!"

jscomp/build_tests/deprecated_bs_suffix/input.js

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+var child_process = require('child_process')
+
+var assert = require('assert').strict
+
+var output = child_process.spawnSync('bsb -clean-world && bsb -make-world',
+    {
+        cwd: __dirname,
+        encoding: 'utf8',
+        stdio : ['inherit','inherit','pipe'],
+        shell : true
+    }
+)
+
+// Should warn the user about the deprecation,
+assert.match(output.stderr, /top-level 'suffix' field is deprecated/)
+
+// ... but still respect it
+assert.equal(output.status, 0)
+assert.ok(require('./demo.bs'))