Add a repl module test for cross_library_deps

Thanks @pranaysashank

tests/haskell_module/repl/BUILD.bazel

@@ -13,6 +13,17 @@ integration_test(
     ],
 )
 
+integration_test(
+    name = "haskell_module_repl_cross_library_deps_test",
+    size = "small",
+    bazel = "//tests:bazel",
+    tags = [
+        # See https://github.com/tweag/rules_haskell/issues/1486
+        "dont_test_on_darwin_with_bindist",
+        "dont_test_on_windows",
+    ],
+)
+
 filegroup(
     name = "all_files",
     testonly = True,

tests/haskell_module/repl/haskell_module_repl_cross_library_deps_test.go

@@ -0,0 +1,183 @@
+package haskell_module_repl_test
+
+import (
+	bt "github.com/bazelbuild/rules_go/go/tools/bazel_testing"
+	it "github.com/tweag/rules_haskell/tests/integration_testing"
+	"testing"
+)
+
+var testcase = `
+-- WORKSPACE --
+load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
+local_repository(
+        name = "rules_haskell",
+        path = "/home/googleson78/git/rules_haskell",
+)
+
+load("@rules_haskell//haskell:repositories.bzl", "rules_haskell_dependencies")
+load("@rules_haskell//tools:os_info.bzl", "os_info")
+
+os_info(name = "os_info")
+
+load("@os_info//:os_info.bzl", "is_windows")
+
+rules_haskell_dependencies()
+load("@rules_haskell//haskell:nixpkgs.bzl", "haskell_register_ghc_nixpkgs")
+
+haskell_register_ghc_nixpkgs(
+    attribute_path = "haskell.compiler.ghc8107",
+    repository = "@rules_haskell//nixpkgs:default.nix",
+    version = "8.10.7",
+)
+
+load("@rules_haskell//haskell:toolchain.bzl", "rules_haskell_toolchains")
+
+rules_haskell_toolchains(version = "8.10.7")
+
+load(
+    "@io_tweag_rules_nixpkgs//nixpkgs:nixpkgs.bzl",
+    "nixpkgs_cc_configure",
+    "nixpkgs_python_configure",
+    "nixpkgs_local_repository",
+    "nixpkgs_package",
+)
+
+nixpkgs_cc_configure(
+    name = "nixpkgs_config_cc",
+    repository = "@rules_haskell//nixpkgs:default.nix",
+)
+
+nixpkgs_python_configure(
+    repository = "@rules_haskell//nixpkgs:default.nix",
+)
+
+nixpkgs_local_repository(
+    name = "nixpkgs_default",
+    nix_file = "@rules_haskell//nixpkgs:default.nix",
+)
+
+load("@rules_haskell//haskell:cabal.bzl", "stack_snapshot")
+
+stack_snapshot(
+    name = "stackage",
+    components = {},
+    local_snapshot = "@rules_haskell//:stackage_snapshot.yaml",
+    packages = ["base"],
+    stack_snapshot_json = "@rules_haskell//:stackage_snapshot.json" if not is_windows else None,
+    tools = [],
+    vendored_packages = {
+        "ghc-paths": "@rules_haskell//tools/ghc-paths",
+    },
+)
+-- package-a/BUILD.bazel --
+load("@rules_haskell//haskell/experimental:defs.bzl", "haskell_module")
+
+# Load rules_haskell rules.
+load(
+    "@rules_haskell//haskell:defs.bzl",
+    "haskell_library",
+    "haskell_toolchain_library",
+)
+
+package(default_visibility = ["//visibility:public"])
+
+haskell_toolchain_library(name = "base")
+
+
+# gazelle_haskell_modules:srcs: src/
+haskell_library(
+    name = "package-a",
+    ghcopts = [
+    ],
+    modules = [
+        ":package-a.PackageA.Mod1",
+        ":package-a.PackageA.Mod2",
+    ],
+    src_strip_prefix = "src",
+    deps = [
+        ":base",
+    ],
+)
+
+# rule generated by gazelle_haskell_modules
+haskell_module(
+    name = "package-a.PackageA.Mod1",
+    src = "src/PackageA/Mod1.hs",
+    src_strip_prefix = "src",
+)
+
+# rule generated by gazelle_haskell_modules
+haskell_module(
+    name = "package-a.PackageA.Mod2",
+    src = "src/PackageA/Mod2.hs",
+    src_strip_prefix = "src",
+    deps = [":package-a.PackageA.Mod1"],
+)
+
+-- package-a/src/PackageA/Mod1.hs --
+module PackageA.Mod1 where
+
+mod1num :: Int
+mod1num = 2
+-- package-a/src/PackageA/Mod2.hs --
+module PackageA.Mod2 where
+
+import PackageA.Mod1
+
+mod2num :: Int
+mod2num = mod1num * 3
+-- package-b/BUILD.bazel --
+load("@rules_haskell//haskell/experimental:defs.bzl", "haskell_module")
+
+# Load rules_haskell rules.
+load(
+    "@rules_haskell//haskell:defs.bzl",
+    "haskell_library",
+    "haskell_toolchain_library",
+)
+
+package(default_visibility = ["//visibility:public"])
+
+haskell_toolchain_library(name = "base")
+
+# gazelle_haskell_modules:srcs: src/
+haskell_library(
+    name = "package-b",
+    ghcopts = [
+    ],
+    modules = [
+        ":package-b.PackageB.Mod1",
+    ],
+    narrowed_deps = ["//package-a"],
+    src_strip_prefix = "src",
+    deps =
+        [":base"],
+)
+
+# rule generated by gazelle_haskell_modules
+haskell_module(
+    name = "package-b.PackageB.Mod1",
+    src = "src/PackageB/Mod1.hs",
+    cross_library_deps = ["//package-a:package-a.PackageA.Mod1"],
+    src_strip_prefix = "src",
+)
+-- package-b/src/PackageB/Mod1.hs --
+module PackageB.Mod1 (PackageB.Mod1.mod1num) where
+
+import qualified PackageA.Mod2
+
+mod1num :: Int
+mod1num = PackageA.Mod2.mod2num * 7
+`
+
+func TestMain(m *testing.M) {
+	it.TestMain(m, bt.Args{Main: testcase})
+}
+
+func TestHsModRepl(t *testing.T) {
+	out, err := it.BazelOutput(it.Context.BazelBinary, "run", "//package-b:package-b@repl", "--", "-ignore-dot-ghci", "-e", "mod1num")
+	if err != nil {
+		t.Fatal(err)
+	}
+	it.AssertOutput(t, out, "42\n")
+}