1 files changed, 45 insertions, 0 deletions
diff --git a/third_party/bazel/rules_haskell/tests/repl-flags/BUILD.bazel b/third_party/bazel/rules_haskell/tests/repl-flags/BUILD.bazel
new file mode 100644
index 000000000000..8fd099dc4d12
--- /dev/null
+++ b/third_party/bazel/rules_haskell/tests/repl-flags/BUILD.bazel
@@ -0,0 +1,45 @@
+load("@io_tweag_rules_haskell//haskell:haskell.bzl", "haskell_test")
+
+package(default_testonly = 1)
+
+# This test the `compiler` flags in many ways:
+# - the test needs to be built with `-DTESTS_TOOLCHAIN_COMPILER_FLAGS`, provided by the toolchain attribute `compiler_flags`
+# - the test needs `-XOverloadedStrings`, provided by this rule `compiler_flags`
+# - toolchain and rule `compiler_flags` are additive, else one of the previous test will fail
+# - the ordering is as such as rule flags are more important that toolchain flags
+
+# This rule must build correctly (using `bazel build`), but also as a repl (using `bazel run //tests/repl-flags:compiler_flags@repl`)
+haskell_test(
+    name = "compiler_flags",
+    srcs = ["CompilerFlags.hs"],
+
+    # This also ensure that local `compiler_flags` does not override the `global ones`
+    compiler_flags = ["-XOverloadedStrings"],
+    visibility = ["//visibility:public"],
+    deps = [
+        "//tests/hackage:base",
+        "//tests/hackage:bytestring",
+    ],
+)
+
+# This test the `repl_ghci_args` flags in a similar way
+# - the test needs to be built with `-DTESTS_TOOLCHAIN_REPL_FLAGS`, provided by the toolchain attribute `compiler_flags`
+# - the test needs `-XOverloadedStrings`, provided by toolchain `repl_ghci_args`
+# - toolchain and rule `compiler_flags` are additive, else one of the previous test will fail
+# - the ordering is as such as rule flags are more important that
+#    toolchain flags and that repl flags are more important that
+#    copmiler flags
+
+# This rule must build correctly (using `bazel build`), but also as a repl (using `bazel run //tests/repl-flags:compiler_flags@repl`). The final result between the repl and the binary must be different
+haskell_test(
+    name = "repl_flags",
+    srcs = ["ReplFlags.hs"],
+
+    # This also ensure that local `repl_flags` does not override the `global ones`
+    repl_ghci_args = ["-DTESTS_TOOLCHAIN_REPL_FLAGS"],
+    visibility = ["//visibility:public"],
+    deps = [
+        "//tests/hackage:base",
+        "//tests/hackage:bytestring",
+    ],
+)