diff --git a/haskell/c2hs.bzl b/haskell/c2hs.bzl
index a653c1cbc..dfba31657 100644
--- a/haskell/c2hs.bzl
+++ b/haskell/c2hs.bzl
@@ -8,7 +8,7 @@ load(
     "target_unique_name",
 )
 load(
-    ":private/providers.bzl",
+    "@io_tweag_rules_haskell//haskell:private/providers.bzl",
     "C2hsLibraryInfo",
 )
 load("@bazel_skylib//:lib.bzl", "paths")
diff --git a/haskell/cc.bzl b/haskell/cc.bzl
index 15c9be5f8..b61dea5e0 100644
--- a/haskell/cc.bzl
+++ b/haskell/cc.bzl
@@ -4,7 +4,7 @@ These rules are temporary and will be deprecated in the future.
 """
 
 load(
-    ":private/providers.bzl",
+    "@io_tweag_rules_haskell//haskell:private/providers.bzl",
     "CcSkylarkApiProviderHacked",
     "HaskellBinaryInfo",
     "HaskellBuildInfo",
diff --git a/haskell/doctest.bzl b/haskell/doctest.bzl
index 7bc9bc87c..6a049f997 100644
--- a/haskell/doctest.bzl
+++ b/haskell/doctest.bzl
@@ -1,7 +1,7 @@
 """Doctest support"""
 
 load(
-    ":private/providers.bzl",
+    "@io_tweag_rules_haskell//haskell:private/providers.bzl",
     "HaskellBinaryInfo",
     "HaskellBuildInfo",
     "HaskellLibraryInfo",
diff --git a/haskell/haddock.bzl b/haskell/haddock.bzl
index 360cbef58..b7cf64191 100644
--- a/haskell/haddock.bzl
+++ b/haskell/haddock.bzl
@@ -4,7 +4,7 @@ load(":private/context.bzl", "haskell_context")
 load(":private/path_utils.bzl", "module_name")
 load(":private/set.bzl", "set")
 load(
-    ":private/providers.bzl",
+    "@io_tweag_rules_haskell//haskell:private/providers.bzl",
     "HaddockInfo",
     "HaskellBuildInfo",
     "HaskellLibraryInfo",
diff --git a/haskell/haskell.bzl b/haskell/haskell.bzl
index 16aa099f5..b7ed4221f 100644
--- a/haskell/haskell.bzl
+++ b/haskell/haskell.bzl
@@ -1,6 +1,9 @@
 """Core Haskell rules"""
 
-load(":private/providers.bzl", "HaskellPrebuiltPackageInfo")
+load(
+    "@io_tweag_rules_haskell//haskell:private/providers.bzl",
+    "HaskellPrebuiltPackageInfo",
+)
 load(":private/set.bzl", "set")
 load("@bazel_skylib//:lib.bzl", "paths")
 load(
diff --git a/haskell/import.bzl b/haskell/import.bzl
index 154f85ceb..f77eda30f 100644
--- a/haskell/import.bzl
+++ b/haskell/import.bzl
@@ -3,7 +3,7 @@
 load(":private/context.bzl", "haskell_context")
 load(":private/actions/package.bzl", "package")
 load(
-    ":private/providers.bzl",
+    "@io_tweag_rules_haskell//haskell:private/providers.bzl",
     "HaddockInfo",
     "HaskellBuildInfo",
     "HaskellLibraryInfo",
diff --git a/haskell/lint.bzl b/haskell/lint.bzl
index 90ef849df..78b7a13aa 100644
--- a/haskell/lint.bzl
+++ b/haskell/lint.bzl
@@ -7,7 +7,7 @@ load(
     "target_unique_name",
 )
 load(
-    ":private/providers.bzl",
+    "@io_tweag_rules_haskell//haskell:private/providers.bzl",
     "HaskellBinaryInfo",
     "HaskellBuildInfo",
     "HaskellLibraryInfo",
diff --git a/haskell/private/actions/compile.bzl b/haskell/private/actions/compile.bzl
index 59a80d956..2c186748f 100644
--- a/haskell/private/actions/compile.bzl
+++ b/haskell/private/actions/compile.bzl
@@ -9,7 +9,7 @@ load(
 )
 load(":private/pkg_id.bzl", "pkg_id")
 load(
-    ":private/providers.bzl",
+    "@io_tweag_rules_haskell//haskell:private/providers.bzl",
     "C2hsLibraryInfo",
     "DefaultCompileInfo",
 )
diff --git a/haskell/private/actions/repl.bzl b/haskell/private/actions/repl.bzl
index 24faacb18..55ab3da00 100644
--- a/haskell/private/actions/repl.bzl
+++ b/haskell/private/actions/repl.bzl
@@ -6,7 +6,7 @@ load(
     "shell",
 )
 load(
-    ":private/providers.bzl",
+    "@io_tweag_rules_haskell//haskell:private/providers.bzl",
     "HaskellBinaryInfo",
     "HaskellBuildInfo",
     "HaskellLibraryInfo",
diff --git a/haskell/private/dependencies.bzl b/haskell/private/dependencies.bzl
index 92dc4981e..3be77c42e 100644
--- a/haskell/private/dependencies.bzl
+++ b/haskell/private/dependencies.bzl
@@ -1,6 +1,6 @@
 load(":private/path_utils.bzl", "ln")
 load(
-    ":private/providers.bzl",
+    "@io_tweag_rules_haskell//haskell:private/providers.bzl",
     "CcSkylarkApiProviderHacked",
     "HaskellBinaryInfo",
     "HaskellBuildInfo",
diff --git a/haskell/private/haskell_impl.bzl b/haskell/private/haskell_impl.bzl
index c5073229d..5ecc639f8 100644
--- a/haskell/private/haskell_impl.bzl
+++ b/haskell/private/haskell_impl.bzl
@@ -21,7 +21,7 @@ load(
     "ln",
 )
 load(
-    ":private/providers.bzl",
+    "@io_tweag_rules_haskell//haskell:private/providers.bzl",
     "C2hsLibraryInfo",
     "HaskellBinaryInfo",
     "HaskellBuildInfo",
diff --git a/haskell/protobuf.bzl b/haskell/protobuf.bzl
index 0fdf5c676..2f6f1d1d4 100644
--- a/haskell/protobuf.bzl
+++ b/haskell/protobuf.bzl
@@ -1,7 +1,7 @@
 """Support for protocol buffers"""
 
 load(
-    ":private/providers.bzl",
+    "@io_tweag_rules_haskell//haskell:private/providers.bzl",
     "HaskellBuildInfo",
     "HaskellLibraryInfo",
     "HaskellProtobufInfo",
diff --git a/skylark/BUILD b/skylark/BUILD
index eac1b8654..b128c7de6 100644
--- a/skylark/BUILD
+++ b/skylark/BUILD
@@ -1,4 +1,6 @@
-exports_files(["lint.bzl"])
+exports_files([
+    "lint.bzl",
+])
 
 sh_binary(
     name = "buildifier",
diff --git a/tests/BUILD b/tests/BUILD
index b25382854..2ae6fde78 100644
--- a/tests/BUILD
+++ b/tests/BUILD
@@ -11,6 +11,7 @@ load(
 )
 load("@bazel_tools//tools/build_rules:test_rules.bzl", "rule_test")
 load("//skylark:lint.bzl", "skylark_lint")
+load(":sh_inline_test.bzl", "sh_inline_test")
 load("@io_tweag_rules_haskell//haskell:import.bzl", haskell_import_new = "haskell_import")
 
 ghc_version = "8.4.4"
@@ -268,12 +269,17 @@ rule_test(
     rule = "//tests/cc_haskell_import:cc-bin",
 )
 
-sh_test(
+sh_inline_test(
     name = "test-haskell_binary-with-link-flags",
     size = "small",
-    srcs = ["scripts/test-threaded.sh"],
     args = ["$(location //tests/binary-with-link-flags:binary-with-link-flags)"],
     data = ["//tests/binary-with-link-flags"],
+    script = """\
+set -e
+
+# Fails if executable was linked without -threaded flag.
+$1 +RTS -N
+""",
 )
 
 rule_test(
diff --git a/tests/library-linkstatic-flag/BUILD b/tests/library-linkstatic-flag/BUILD
new file mode 100644
index 000000000..af1bc5bfc
--- /dev/null
+++ b/tests/library-linkstatic-flag/BUILD
@@ -0,0 +1,109 @@
+# test whether `linkstatic` works as expected
+package(default_testonly = 1)
+
+load("//tests:sh_inline_test.bzl", "sh_inline_test")
+load(":get_library_files.bzl", "get_libraries_as_runfiles")
+
+load(
+    "@io_tweag_rules_haskell//haskell:haskell.bzl",
+    "haskell_library",
+)
+
+# only .a files
+haskell_library(
+    name = "library-static-only",
+    srcs = ["Lib.hs"],
+    visibility = ["//visibility:public"],
+    deps = [
+        "@hackage//:base",
+        "@hackage//:bytestring",
+    ],
+    linkstatic = True, # <--
+)
+
+# both .a and .so files
+haskell_library(
+    name = "library-static-and-dynamic",
+    srcs = ["Lib.hs"],
+    visibility = ["//visibility:public"],
+    deps = [
+        "@hackage//:base",
+        "@hackage//:bytestring",
+    ],
+    linkstatic = False, # <--
+)
+
+# extract all libraries from the haskell_library
+get_libraries_as_runfiles(
+    name = "library-static-only-libraries",
+    library = ":library-static-only",
+)
+get_libraries_as_runfiles(
+    name = "library-static-and-dynamic-libraries",
+    library = ":library-static-and-dynamic",
+)
+
+# sh_test’s `data` doesn’t add stuff to runfiles :(
+# sh_library can bundle different targets as runfiles for sh_test
+# TODO(Profpatsch): add functionality to sh_inline_test by default?
+sh_library(
+    name = "bundled-dependency-files-static-only",
+    data = [":library-static-only-libraries"]
+)
+sh_library(
+    name = "bundled-dependency-files-static-and-dynamic",
+    data = [":library-static-and-dynamic-libraries"]
+)
+
+# ensure that linkstatic=True only creates only .a, no .so
+sh_inline_test(
+    name = "test-linkstatic-static-only",
+    script = """
+set -euo pipefail
+for f in "$@"; do
+    if ! [[ "$f" =~ .a$ ]]; then
+      echo "not a static library: $f"
+      exit 1
+    fi
+done
+""",
+    # pass the file names as arguments
+    args = ["$(rootpaths :library-static-only-libraries)"],
+    data = [
+        # for rootpaths
+        ":library-static-only-libraries",
+        # to actually get the files …
+        ":bundled-dependency-files-static-only"],
+    size = "small",
+)
+
+# test whether .so is linked dynamically and .a statically
+sh_inline_test(
+    name = "test-libraries-static-and-dynamic",
+    script = """
+set -euo pipefail
+is_dynamic () {
+    # taken from https://github.com/NixOS/nixpkgs/blob/0b3f50f844e2a6b507b18d7c5259bb850b382f87/pkgs/build-support/setup-hooks/auto-patchelf.sh#L167-L170
+    readelf -l -- "$1" | grep -q "^ *INTERP\\>"
+}
+
+for f in "$@"; do
+    if [[ "$f" =~ .a$ ]] && is_dynamic "$f"; then
+        echo "should be a static executable: $f"
+        exit 1
+    fi
+    if [[ "$f" =~ .so$ ]] && ! is_dynamic "$f"; then
+        echo "should be a dynamic executable: $f"
+        exit 1
+    fi
+done
+""",
+    # pass the file names as arguments
+    args = ["$(rootpaths :library-static-and-dynamic-libraries)"],
+    data = [
+        # for rootpaths
+        ":library-static-and-dynamic-libraries",
+        # to actually get the files …
+        ":bundled-dependency-files-static-and-dynamic"],
+    size = "small",
+)
diff --git a/tests/library-static-only/Lib.hs b/tests/library-linkstatic-flag/Lib.hs
similarity index 100%
rename from tests/library-static-only/Lib.hs
rename to tests/library-linkstatic-flag/Lib.hs
diff --git a/tests/library-static-only/Main.hs b/tests/library-linkstatic-flag/Main.hs
similarity index 100%
rename from tests/library-static-only/Main.hs
rename to tests/library-linkstatic-flag/Main.hs
diff --git a/tests/library-linkstatic-flag/get_library_files.bzl b/tests/library-linkstatic-flag/get_library_files.bzl
new file mode 100644
index 000000000..54490144e
--- /dev/null
+++ b/tests/library-linkstatic-flag/get_library_files.bzl
@@ -0,0 +1,28 @@
+load(
+    "@io_tweag_rules_haskell//haskell:private/providers.bzl",
+    "HaskellBuildInfo",
+    "HaskellLibraryInfo",
+)
+load("//haskell:private/set.bzl", "set")
+
+def _get_libraries_as_runfiles_impl(ctx):
+    """Extract all library files from a haskell_library target
+    and put them in this target’s files"""
+    bi = ctx.attr.library[HaskellBuildInfo]
+    return [DefaultInfo(
+        # not necessarily complete
+        files = depset(
+            direct = bi.static_libraries,
+            transitive = [set.to_depset(bi.dynamic_libraries)]
+        ),
+    )]
+
+get_libraries_as_runfiles = rule(
+    _get_libraries_as_runfiles_impl,
+    attrs = {
+        "library": attr.label(
+            mandatory = True,
+            providers = [HaskellBuildInfo, HaskellLibraryInfo],
+        )
+    }
+)
diff --git a/tests/library-static-only/BUILD b/tests/library-static-only/BUILD
deleted file mode 100644
index 830f8358b..000000000
--- a/tests/library-static-only/BUILD
+++ /dev/null
@@ -1,17 +0,0 @@
-package(default_testonly = 1)
-
-load(
-    "@io_tweag_rules_haskell//haskell:haskell.bzl",
-    "haskell_library",
-)
-
-haskell_library(
-    name = "library-static-only",
-    srcs = ["Lib.hs"],
-    visibility = ["//visibility:public"],
-    deps = [
-        "@hackage//:base",
-        "@hackage//:bytestring",
-    ],
-    linkstatic = True,
-)
diff --git a/tests/scripts/test-threaded.sh b/tests/scripts/test-threaded.sh
deleted file mode 100755
index 37829c677..000000000
--- a/tests/scripts/test-threaded.sh
+++ /dev/null
@@ -1,6 +0,0 @@
-#/usr/bin/env sh
-
-set -e
-
-# Fails if executable was linked without -threaded flag.
-$1 +RTS -N
diff --git a/tests/sh_inline_test.bzl b/tests/sh_inline_test.bzl
new file mode 100644
index 000000000..d8fcb8817
--- /dev/null
+++ b/tests/sh_inline_test.bzl
@@ -0,0 +1,60 @@
+load("@bazel_skylib//:lib.bzl", "shell")
+
+def quote_make_variables(s):
+    """Quote all genrule “Make” Variables in a string."""
+    return s.replace("$", "$$")
+
+def target_from_string(name, string):
+    """Write a skylark string to a target."""
+    native.genrule(
+        name = name + "-file",
+        outs = [name],
+        # this is exceptionally ugly.
+        cmd = """echo -n {quoted} > $(@)""".format(
+            # but should at least be quoted right
+            quoted = shell.quote(quote_make_variables(string)),
+        ),
+    )
+
+bash_runfiles_boilerplate = """\
+# Copy-pasted from Bazel's Bash runfiles library (tools/bash/runfiles/runfiles.bash).
+set -euo pipefail
+if [[ ! -d "${RUNFILES_DIR:-/dev/null}" && ! -f "${RUNFILES_MANIFEST_FILE:-/dev/null}" ]]; then
+  if [[ -f "$0.runfiles_manifest" ]]; then
+    export RUNFILES_MANIFEST_FILE="$0.runfiles_manifest"
+  elif [[ -f "$0.runfiles/MANIFEST" ]]; then
+    export RUNFILES_MANIFEST_FILE="$0.runfiles/MANIFEST"
+  elif [[ -f "$0.runfiles/bazel_tools/tools/bash/runfiles/runfiles.bash" ]]; then
+    export RUNFILES_DIR="$0.runfiles"
+  fi
+fi
+if [[ -f "${RUNFILES_DIR:-/dev/null}/bazel_tools/tools/bash/runfiles/runfiles.bash" ]]; then
+  source "${RUNFILES_DIR}/bazel_tools/tools/bash/runfiles/runfiles.bash"
+elif [[ -f "${RUNFILES_MANIFEST_FILE:-/dev/null}" ]]; then
+  source "$(grep -m1 "^bazel_tools/tools/bash/runfiles/runfiles.bash " \
+            "$RUNFILES_MANIFEST_FILE" | cut -d ' ' -f 2-)"
+else
+  echo >&2 "ERROR: cannot find @bazel_tools//tools/bash/runfiles:runfiles.bash"
+  exit 1
+fi
+# --- end runfiles.bash initialization ---
+"""
+
+def sh_inline_test(name, script, **kwargs):
+    """Like sh_test, but instead of srcs takes the shell script
+    as verbatim bazel string. The bash runfiles are in scope,
+    using `rlocation` works by default.
+    """
+    script_name = name + ".sh"
+    script = bash_runfiles_boilerplate + script
+
+    target_from_string(script_name, script)
+
+    deps = kwargs.pop("deps", [])
+
+    native.sh_test(
+        name = name,
+        srcs = [script_name],
+        deps = ["@bazel_tools//tools/bash/runfiles"] + deps,
+        **kwargs
+    )