diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000..9d44a69
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,5 @@
+*.sh eol=lf
+*.py eol=lf
+/git-filter-repo eol=lf
+/contrib/filter-repo-demos/[a-z]* eol=lf
+/t/t9*/* eol=lf
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
new file mode 100644
index 0000000..1d22fe7
--- /dev/null
+++ b/.github/workflows/test.yml
@@ -0,0 +1,49 @@
+name: Run tests
+
+on: [push, pull_request]
+
+jobs:
+  run-tests:
+    strategy:
+      matrix:
+        os: [ 'windows', 'ubuntu', 'macos' ]
+      fail-fast: false
+    runs-on: ${{ matrix.os }}-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: Setup python
+      uses: actions/setup-python@v2
+      with:
+        python-version: 3.x
+    - name: test
+      shell: bash
+      run: |
+        # setup-python puts `python` into the `PATH`, not `python3`, yet
+        # `git-filter-repo` expects `python3` in the `PATH`. Let's add
+        # a shim.
+        printf '#!/bin/sh\n\nexec python "$@"\n' >python3 &&
+
+        export PATH=$PWD:$PATH &&
+        export PYTHONPATH=$PWD &&
+        export TEST_SHELL_PATH=/bin/sh &&
+
+        failed=0 &&
+        cd t &&
+        for t in t[0-9]*.sh
+        do
+          printf '\n\n== %s ==\n' "$t" &&
+          bash $t -q -v -x ||
+          failed=$(($failed+1))
+        done &&
+        if test 0 != $failed
+        then
+          mkdir ../failed &&
+          tar czf ../failed/failed.tar.gz .
+          exit 1
+        fi
+    - name: upload failed tests' directories
+      if: failure()
+      uses: actions/upload-artifact@v1
+      with:
+        name: failed-${{ matrix.os }}
+        path: failed
diff --git a/.gitignore b/.gitignore
index 6dfbd93..cd5ded4 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,3 +2,4 @@
 /Documentation/man1/
 /t/test-results
 /t/trash directory*
+/__pycache__/
diff --git a/t/t9390-filter-repo.sh b/t/t9390-filter-repo.sh
index 8ab4749..3c8f849 100755
--- a/t/t9390-filter-repo.sh
+++ b/t/t9390-filter-repo.sh
@@ -298,7 +298,7 @@ setup_metasyntactic_repo() {
 	)
 }
 
-test_expect_success '--tag-rename' '
+test_expect_success FUNNYNAMES '--tag-rename' '
 	setup_metasyntactic_repo &&
 	(
 		git clone file://"$(pwd)"/metasyntactic tag_rename &&
@@ -342,7 +342,7 @@ test_expect_success 'tag of tag before relevant portion of history' '
 	)
 '
 
-test_expect_success '--subdirectory-filter' '
+test_expect_success FUNNYNAMES '--subdirectory-filter' '
 	setup_metasyntactic_repo &&
 	(
 		git clone file://"$(pwd)"/metasyntactic subdir_filter &&
@@ -361,7 +361,7 @@ test_expect_success '--subdirectory-filter' '
 	)
 '
 
-test_expect_success '--subdirectory-filter with trailing slash' '
+test_expect_success FUNNYNAMES '--subdirectory-filter with trailing slash' '
 	setup_metasyntactic_repo &&
 	(
 		git clone file://"$(pwd)"/metasyntactic subdir_filter_2 &&
@@ -380,7 +380,7 @@ test_expect_success '--subdirectory-filter with trailing slash' '
 	)
 '
 
-test_expect_success '--to-subdirectory-filter' '
+test_expect_success FUNNYNAMES '--to-subdirectory-filter' '
 	setup_metasyntactic_repo &&
 	(
 		git clone file://"$(pwd)"/metasyntactic to_subdir_filter &&
@@ -400,7 +400,7 @@ test_expect_success '--to-subdirectory-filter' '
 	)
 '
 
-test_expect_success '--use-base-name' '
+test_expect_success FUNNYNAMES '--use-base-name' '
 	setup_metasyntactic_repo &&
 	(
 		git clone file://"$(pwd)"/metasyntactic use_base_name &&
@@ -419,7 +419,7 @@ test_expect_success '--use-base-name' '
 	)
 '
 
-test_expect_success 'refs/replace/ to skip a parent' '
+test_expect_success FUNNYNAMES 'refs/replace/ to skip a parent' '
 	setup_metasyntactic_repo &&
 	(
 		git clone file://"$(pwd)"/metasyntactic replace_skip_ref &&
@@ -441,7 +441,7 @@ test_expect_success 'refs/replace/ to skip a parent' '
 	)
 '
 
-test_expect_success 'refs/replace/ to add more initial history' '
+test_expect_success FUNNYNAMES 'refs/replace/ to add more initial history' '
 	setup_metasyntactic_repo &&
 	(
 		git clone file://"$(pwd)"/metasyntactic replace_add_refs &&
@@ -476,7 +476,7 @@ test_expect_success 'refs/replace/ to add more initial history' '
 	)
 '
 
-test_expect_success 'creation/deletion/updating of replace refs' '
+test_expect_success FUNNYNAMES 'creation/deletion/updating of replace refs' '
 	setup_metasyntactic_repo &&
 	(
 		git clone file://"$(pwd)"/metasyntactic replace_handling &&
@@ -535,7 +535,7 @@ test_expect_success 'creation/deletion/updating of replace refs' '
 	)
 '
 
-test_expect_success '--debug' '
+test_expect_success FUNNYNAMES '--debug' '
 	setup_metasyntactic_repo &&
 	(
 		git clone file://"$(pwd)"/metasyntactic debug &&
@@ -558,7 +558,7 @@ test_expect_success '--debug' '
 	)
 '
 
-test_expect_success '--dry-run' '
+test_expect_success FUNNYNAMES '--dry-run' '
 	setup_metasyntactic_repo &&
 	(
 		git clone file://"$(pwd)"/metasyntactic dry_run &&
@@ -586,7 +586,7 @@ test_expect_success '--dry-run' '
 	)
 '
 
-test_expect_success '--dry-run --debug' '
+test_expect_success FUNNYNAMES '--dry-run --debug' '
 	setup_metasyntactic_repo &&
 	(
 		git clone file://"$(pwd)"/metasyntactic dry_run_debug &&
@@ -614,7 +614,7 @@ test_expect_success '--dry-run --debug' '
 	)
 '
 
-test_expect_success '--dry-run --stdin' '
+test_expect_success FUNNYNAMES '--dry-run --stdin' '
 	setup_metasyntactic_repo &&
 	(
 		git clone file://"$(pwd)"/metasyntactic dry_run_stdin &&
@@ -917,7 +917,8 @@ test_expect_success '--strip-blobs-with-ids' '
 		grep fake_submodule ../filenames &&
 
 		# Strip "a certain file" files
-		git filter-repo --strip-blobs-with-ids <(echo deadbeefdeadbeefdeadbeefdeadbeefdeadbeef) &&
+		echo deadbeefdeadbeefdeadbeefdeadbeefdeadbeef >../input &&
+		git filter-repo --strip-blobs-with-ids ../input &&
 
 		git log --format=%n --name-only | sort | uniq >../filenames &&
 		test_line_count = 10 ../filenames &&
@@ -937,12 +938,12 @@ test_expect_success '--strip-blobs-with-ids' '
 		git filter-repo --strip-blobs-with-ids ../bad-ids --replace-text ../replace-rules &&
 
 		git log --format=%n --name-only | sort | uniq >../filenames &&
-		test_line_count = 5 ../filenames &&
+		test_line_count = 6 ../filenames &&
 		! grep sequence/to ../filenames &&
 		! grep words/to ../filenames &&
 		! grep capricious ../filenames &&
 		! grep fickle ../filenames &&
-		! grep mercurial ../filenames
+		! grep mercurial ../filenames &&
 
 		# Remove the temporary auxiliary files
 		rm ../bad-ids &&
@@ -1196,6 +1197,12 @@ test_expect_success 'startup sanity checks' '
 
 test_expect_success 'other startup error cases and requests for help' '
 	(
+		# prevent MSYS2 (Git for Windows) from converting the colon to
+		# a semicolon when encountering parameters that look like
+		# Unix-style, colon-separated path lists (such as `foo:.`)
+		MSYS_NO_PATHCONV=1 &&
+		export MSYS_NO_PATHCONV
+
 		git init startup_errors &&
 		cd startup_errors &&
 
@@ -1232,10 +1239,12 @@ test_expect_success 'other startup error cases and requests for help' '
 		test_must_fail git filter-repo --path-rename foo:bar/ 2>err &&
 		test_i18ngrep "either ends with a slash then both must." err &&
 
-		test_must_fail git filter-repo --paths-from-file <(echo "foo==>bar/") 2>err &&
+		echo "foo==>bar/" >input &&
+		test_must_fail git filter-repo --paths-from-file input 2>err &&
 		test_i18ngrep "either ends with a slash then both must." err &&
 
-		test_must_fail git filter-repo --paths-from-file <(echo "glob:*.py==>newname") 2>err &&
+		echo "glob:*.py==>newname" >input &&
+		test_must_fail git filter-repo --paths-from-file input 2>err &&
 		test_i18ngrep "renaming globs makes no sense" err &&
 
 		test_must_fail git filter-repo --strip-blobs-bigger-than 3GiB 2>err &&
@@ -1282,8 +1291,9 @@ test_expect_success 'mailmap sanity checks' '
 		git clone file://"$(pwd)"/analyze_me mailmap_sanity_checks &&
 		cd mailmap_sanity_checks &&
 
-		test_must_fail git filter-repo --mailmap /fake/path 2>../err &&
-		test_i18ngrep "Cannot read /fake/path" ../err &&
+		fake=$(pwd)/fake &&
+		test_must_fail git filter-repo --mailmap "$fake"/path 2>../err &&
+		test_i18ngrep "Cannot read $fake/path" ../err &&
 
 		echo "Total Bogus" >../whoopsies &&
 		test_must_fail git filter-repo --mailmap ../whoopsies 2>../err &&
@@ -1358,7 +1368,8 @@ test_expect_success '--refs and --replace-text' '
 		git clone file://"$(pwd)"/path_rename refs_and_replace_text &&
 		cd refs_and_replace_text &&
 		git rev-parse --short=10 HEAD~1 >myparent &&
-		git filter-repo --force --replace-text <(echo "10==>TEN") --refs $(cat myparent)..master &&
+		echo "10==>TEN" >input &&
+		git filter-repo --force --replace-text input --refs $(cat myparent)..master &&
 		cat <<-EOF >expect &&
 		TEN11
 		EOF
@@ -1565,7 +1576,7 @@ test_expect_success '--state-branch with expanding paths and refs' '
 	)
 '
 
-test_expect_success 'degenerate merge with non-matching filenames' '
+test_expect_success FUNNYNAMES 'degenerate merge with non-matching filenames' '
 	test_create_repo degenerate_merge_differing_filenames &&
 	(
 		cd degenerate_merge_differing_filenames &&
@@ -1629,7 +1640,8 @@ test_expect_success 'degenerate merge with typechange' '
 		git ls-files >actual &&
 		test_cmp expect actual &&
 
-		test_line_count = 2 <(git log --oneline HEAD)
+		git log --oneline HEAD >input &&
+		test_line_count = 2 input
 	)
 '
 
@@ -1670,7 +1682,7 @@ test_expect_success 'tweaking just a tag' '
 
 test_expect_success '--version' '
 	git filter-repo --version >actual &&
-	git hash-object ../../git-filter-repo | colrm 13 >expect &&
+	git hash-object ../../git-filter-repo | cut -c 1-12 >expect &&
 	test_cmp expect actual
 '
 
diff --git a/t/t9391-filter-repo-lib-usage.sh b/t/t9391-filter-repo-lib-usage.sh
index f2ac101..761f43a 100755
--- a/t/t9391-filter-repo-lib-usage.sh
+++ b/t/t9391-filter-repo-lib-usage.sh
@@ -164,10 +164,16 @@ test_expect_success 'other error cases' '
 	)
 '
 
+test_lazy_prereq DOS2UNIX '
+	dos2unix -h
+	test $? -ne 127
+'
+
 test_expect_success 'lint-history' '
 	test_create_repo lint-history &&
 	(
 		cd lint-history &&
+		git config core.autocrlf false &&
 		echo initial >content &&
 		git add content &&
 		git commit -m "initial" &&
@@ -180,10 +186,13 @@ test_expect_success 'lint-history' '
 		git add content &&
 		git commit -m "oops, that was embarassing" &&
 
-		$CONTRIB_DIR/lint-history --filenames-important dos2unix &&
-		echo 2 >expect &&
-		git rev-list --count HEAD >actual &&
-		test_cmp expect actual
+		if test_have_prereq DOS2UNIX
+		then
+			$CONTRIB_DIR/lint-history --filenames-important dos2unix &&
+			echo 2 >expect &&
+			git rev-list --count HEAD >actual &&
+			test_cmp expect actual
+		fi
 	)
 '