diff --git a/.editorconfig b/.editorconfig
new file mode 100644
index 0000000..a56f2d2
--- /dev/null
+++ b/.editorconfig
@@ -0,0 +1,10 @@
+# https://editorconfig.org
+root = true
+
+[*]
+indent_style = space
+indent_size = 2
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
diff --git a/.github/verify-version.sh b/.github/verify-version.sh
new file mode 100755
index 0000000..4ceb087
--- /dev/null
+++ b/.github/verify-version.sh
@@ -0,0 +1,18 @@
+#!/usr/bin/env bash
+
+# This script verifies that the version of Nix installed on the runner
+# matches the version supplied in the first argument.
+
+EXPECTED_VERSION="${1}"
+
+INSTALLED_NIX_VERSION_OUTPUT=$(nix --version)
+INSTALLED_NIX_VERSION=$(echo "${INSTALLED_NIX_VERSION_OUTPUT}" | awk '{print $NF}')
+EXPECTED_OUTPUT="nix (Nix) ${EXPECTED_VERSION}"
+
+if [ "${INSTALLED_NIX_VERSION_OUTPUT}" != "${EXPECTED_OUTPUT}" ]; then
+  echo "Nix version ${INSTALLED_NIX_VERSION} didn't match expected version ${EXPECTED_VERSION}"
+  exit 1
+else
+  echo "Success! Nix version ${INSTALLED_NIX_VERSION} installed as expected"
+  exit 0
+fi
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index ea4947a..8307047 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -211,3 +211,48 @@ jobs:
         with:
           duration: 5m
           authorized-users: grahamc
+
+  install-with-non-default-source-inputs:
+    name: Install Nix using non-default source-* inputs
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install with alternative source-url
+        uses: ./
+        with:
+          source-url: https://github.com/DeterminateSystems/nix-installer/releases/download/v0.18.0/nix-installer-x86_64-linux
+      - name: Ensure that the expected Nix version is installed via alternative source-url
+        run: .github/verify-version.sh 2.21.2
+
+      - name: Install with alternative source-pr
+        uses: ./
+        with:
+          # https://github.com/DeterminateSystems/nix-installer/pull/665
+          source-pr: "665"
+      - name: Ensure that the expected Nix version is installed via alternative source-pr
+        run: .github/verify-version.sh 2.18.0
+
+      - name: Install with alternative source-revision
+        uses: ./
+        with:
+          # https://github.com/DeterminateSystems/nix-installer/tree/ccf1d39a83099657ad324e7927676432435431e1
+          source-revision: "ccf1d39a83099657ad324e7927676432435431e1"
+      - name: Ensure that the expected Nix version is installed via alternative source-revision
+        run: .github/verify-version.sh 2.21.2
+
+      - name: Install with alternative source-branch
+        uses: ./
+        with:
+          # https://github.com/DeterminateSystems/nix-installer/tree/lazy-trees
+          source-revision: "lazy-trees"
+      - name: Ensure that the expected Nix version is installed via alternative source-branch
+        run: .github/verify-version.sh 2.21.2
+
+      - name: Install with alternative source-tag
+        uses: ./
+        with:
+          # https://github.com/DeterminateSystems/nix-installer/tree/v0.14.0
+          source-tag: "v0.14.0"
+      - name: Ensure that the expected Nix version is installed via alternative source-tag
+        run: .github/verify-version.sh 2.18.0
diff --git a/action.yml b/action.yml
index fb27ca3..b44d1ed 100644
--- a/action.yml
+++ b/action.yml
@@ -92,7 +92,7 @@ inputs:
     description: The tag of `nix-installer` to use (conflicts with `source-revision`, `source-branch`, `source-pr`)
     required: false
   source-url:
-    description: A URL pointing to a `nix-installer.sh` script
+    description: A URL pointing to a `nix-installer` executable
     required: false
   nix-package-url:
     description: The Nix package URL