test with elm-test

BUCK

@@ -1,11 +1,19 @@
 # A list of available rules and their signatures can be found here: https://buck2.build/docs/api/rules/
-load("@prelude-nri//:elm.bzl", "elm_docs", "elm_format_diffs")
+load("@prelude-nri//:elm.bzl", "elm_docs", "elm_format_diffs", "elm_test")
 load("@prelude-nri//:node.bzl", "node_modules", "npm_bin", "npm_script_test", "prettier_diffs")
 
 elm_docs(
     name = "docs.json",
     elm_json = "elm.json",
     src = "src",
+    tests = [
+        ":elm_test",
+    ],
+)
+
+elm_test(
+    name = "elm_test",
+    test_srcs = glob(["test/**/*.elm"]),
 )
 
 filegroup(

component-catalog/BUCK

@@ -1,4 +1,4 @@
-load("@prelude-nri//:elm.bzl", "elm_app", "elm_format_diffs")
+load("@prelude-nri//:elm.bzl", "elm_app", "elm_format_diffs", "elm_test")
 load("@prelude-nri//:node.bzl", "prettier_diffs")
 
 elm_app(
@@ -10,6 +10,14 @@ elm_app(
         "../src": "//:src",
         "src": "src",
     },
+    tests = [
+        ":elm_test",
+    ],
+)
+
+elm_test(
+    name = "elm_test",
+    test_srcs = glob(["tests/**/*.elm"]),
 )
 
 filegroup(

prelude-nri/elm.bzl

@@ -154,4 +154,45 @@ elm_format_diffs = rule(
             providers = [ElmToolchainInfo],
         ),
     }
+)
+
+def _elm_test_impl(ctx: "context") -> [[DefaultInfo.type, ExternalRunnerTestInfo.type]]:
+    command = [
+        ctx.attrs._python_toolchain[PythonToolchainInfo].interpreter,
+        cmd_args(ctx.attrs._elm_toolchain[ElmToolchainInfo].elm_test_workdir[DefaultInfo].default_outputs),
+        "--elm-test-binary", "elm-test", # TODO parameterize
+        ctx.label.package or '.',
+        cmd_args(ctx.attrs._elm_toolchain.get(ElmToolchainInfo).elm, format="--compiler={}"),
+        cmd_args(str(ctx.attrs.fuzz), format="--fuzz={}"),
+    ]
+
+    if ctx.attrs.seed:
+        command.append(cmd_args(ctx.attrs.seed, format="--seed={}"))
+
+    command.extend(ctx.attrs.test_srcs)
+
+    return [
+        DefaultInfo(),
+        ExternalRunnerTestInfo(
+            type = "elm_test",
+            command = command,
+            run_from_project_root = False,
+        ),
+    ]
+
+elm_test = rule(
+    impl = _elm_test_impl,
+    attrs = {
+        "test_srcs": attrs.list(attrs.source()),
+        "fuzz": attrs.int(default=100),
+        "seed": attrs.option(attrs.string(), default=None),
+        "_elm_toolchain": attrs.toolchain_dep(
+            default = "toolchains//:elm",
+            providers = [ElmToolchainInfo],
+        ),
+        "_python_toolchain": attrs.toolchain_dep(
+            default = "toolchains//:python",
+            providers = [PythonToolchainInfo],
+        ),
+    },
 )

prelude-nri/elm/BUCK

@@ -3,6 +3,11 @@ export_file(
     visibility = ["PUBLIC"],
 )
 
+export_file(
+    name = "elm_test_workdir.py",
+    visibility = ["PUBLIC"],
+)
+
 ELM_COMPILER_URL = select({
     "config//os:linux": "https://github.com/elm/compiler/releases/download/0.19.1/binary-for-linux-64-bit.gz",
     "config//os:macos": "https://github.com/elm/compiler/releases/download/0.19.1/binary-for-mac-64-bit.gz",
@@ -24,6 +29,7 @@ genrule(
     cmd = "gzip --decompress --stdout --keep $(location :elm_compiler_archive) > $OUT && chmod +x $OUT",
     out = "elm",
     executable = True,
+    remote = True,
     visibility = ["PUBLIC"],
 )
 
@@ -54,5 +60,6 @@ genrule(
     out = "elm-format",
     cmd = "cp $(location :elm_format_archive)/elm-format $OUT",
     executable = True,
+    remote = True,
     visibility = ["PUBLIC"],
 )

prelude-nri/elm/elm_test_workdir.py

@@ -0,0 +1,27 @@
+#!/usr/bin/env python
+import argparse
+import subprocess
+import sys
+
+if __name__ == "__main__":
+    parser = argparse.ArgumentParser()
+    parser.add_argument(
+        "root", help="Where to change directory to before running elm-test"
+    )
+    parser.add_argument(
+        "--elm-test-binary",
+        default="elm-test",
+        help="The binary to invoke for elm-test",
+    )
+    parser.add_argument(
+        "elm_test_args",
+        nargs=argparse.REMAINDER,
+        help="Args to be passed on to elm-test",
+    )
+
+    args = parser.parse_args()
+
+    returncode = subprocess.call(
+        [args.elm_test_binary] + args.elm_test_args, cwd=args.root
+    )
+    sys.exit(returncode)

prelude-nri/elm/toolchain.bzl

@@ -1,7 +1,8 @@
 ElmToolchainInfo = provider(fields = [
     "elm",
-    "isolated_compile",
     "elm_format",
+    "isolated_compile",
+    "elm_test_workdir",
 ])
 
 def _system_elm_toolchain_impl(ctx) -> [[DefaultInfo.type, ElmToolchainInfo.type]]:
@@ -15,6 +16,7 @@ def _system_elm_toolchain_impl(ctx) -> [[DefaultInfo.type, ElmToolchainInfo.type
             elm = RunInfo(args = ["elm"]),
             elm_format = RunInfo(args = ["elm-format"]),
             isolated_compile = ctx.attrs._isolated_compile,
+            elm_test_workdir = ctx.attrs._elm_test_workdir,
         ),
     ]
 
@@ -22,6 +24,7 @@ system_elm_toolchain = rule(
     impl = _system_elm_toolchain_impl,
     attrs = {
         "_isolated_compile": attrs.dep(default = "prelude-nri//elm:isolated_compile.py"),
+        "_elm_test_workdir": attrs.dep(default = "prelude-nri//elm:elm_test_workdir.py"),
     },
     is_toolchain_rule = True,
 )
@@ -37,21 +40,23 @@ def _elm_toolchain_impl(ctx: "context") -> [[DefaultInfo.type, ElmToolchainInfo.
             elm = ctx.attrs.elm[RunInfo],
             elm_format = ctx.attrs.elm_format[RunInfo],
             isolated_compile = ctx.attrs._isolated_compile,
+            elm_test_workdir = ctx.attrs._elm_test_workdir,
         ),
     ]
 
 elm_toolchain = rule(
     impl = _elm_toolchain_impl,
     attrs = {
-        "elm": attrs.dep(
+        "elm": attrs.exec_dep(
             providers = [RunInfo],
             default = "prelude-nri//elm:elm_compiler_binary",
         ),
-        "elm_format": attrs.dep(
+        "elm_format": attrs.exec_dep(
             providers = [RunInfo],
             default = "prelude-nri//elm:elm_format_binary",
         ),
         "_isolated_compile": attrs.dep(default = "prelude-nri//elm:isolated_compile.py"),
+        "_elm_test_workdir": attrs.dep(default = "prelude-nri//elm:elm_test_workdir.py"),
     },
     is_toolchain_rule = True,
 )