feat(slug): expose GITHUB_REPOSITORY slugs

tests/slug.bats

@@ -0,0 +1,49 @@
+#!/usr/bin/env bats
+
+@test "slug: a word" {
+  test_slug \
+    "word" \
+    "word"
+}
+
+@test "slug: a string" {
+  test_slug \
+    "basic-string" \
+    "basic-string"
+}
+
+@test "slug: a string in camel case" {
+  test_slug \
+    "camelCase" \
+    "camelcase"
+}
+
+@test "slug: a path" {
+  test_slug \
+    "path/to/something" \
+    "path-to-something"
+}
+
+@test "slug: a number" {
+  test_slug \
+    "4.2" \
+    "4.2"
+}
+
+@test "slug: a very long string" {
+  test_slug \
+    "an-awesome-Feature-Very-Very-Very-Very-Very-Very-Very-Long-moreThan63Characters" \
+    "an-awesome-feature-very-very-very-very-very-very-very-long-more"
+}
+
+# Load sluf_ref function
+source entrypoint.sh > /dev/null 2>&1
+
+test_slug() {
+  given="${1}"
+  expected="${2}"
+
+  actual="$(slug \"${given}\")"
+  echo "expected : [${expected}], actual : [${actual}]"
+  [ "${actual}" == "${expected}" ]
+}