diff --git a/test/functions.ts b/test/functions.ts
index f0002fc..c10e39e 100644
--- a/test/functions.ts
+++ b/test/functions.ts
@@ -1,37 +1,113 @@
-import * as github from "@actions/github"
-import { GitHub } from "@actions/github/lib/utils"
-import anyTest, { TestFn } from "ava" // eslint-disable-line import/no-unresolved
+import test from "ava" // eslint-disable-line import/no-unresolved
 
 import * as functions from "../src/functions"
-import { getReleaseTag, getToken } from "./utils"
+import { NextflowRelease } from "../src/NextflowRelease"
 
-const test = anyTest as TestFn<{
-  token: string
-  octokit: InstanceType<typeof GitHub>
-}>
-
-test.before(t => {
-  const first = true
-  const current_token = getToken(first)
-  t.context = {
-    token: current_token,
-    octokit: github.getOctokit(current_token)
+// The Nextflow releases we are going to use for testing follow a regular
+// pattern: create a mock function to bootstrap some test data without repeating
+// ourselves
+function nf_release_gen(version_number: string): NextflowRelease {
+  const is_edge = version_number.endsWith("-edge")
+  const release: NextflowRelease = {
+    versionNumber: version_number,
+    isEdge: is_edge,
+    binaryURL: `https://github.com/nextflow-io/nextflow/releases/download/${version_number}/nextflow`,
+    allBinaryURL: `https://github.com/nextflow-io/nextflow/releases/download/${version_number}/nextflow-${version_number.replace(
+      "v",
+      ""
+    )}-all`
   }
-})
+  return release
+}
 
-test("all_nf_releases", async t => {
-  const result = await functions.all_nf_releases(t.context["octokit"])
-  t.is(typeof result, "object")
-})
+// A mock set of Nextflow releases
+const edge_is_newer = [
+  nf_release_gen("v23.09.1-edge"),
+  nf_release_gen("v23.04.3"),
+  nf_release_gen("v23.04.2")
+]
+const edge_is_older = [
+  nf_release_gen("v23.04.3"),
+  nf_release_gen("v23.04.2"),
+  nf_release_gen("v23.03.0-edge")
+]
 
-test("lastest_stable_release_data", async t => {
-  const result = await functions.latest_stable_release_data(
-    t.context["octokit"]
-  )
-  t.is(typeof result, "object")
-  const expected = await getReleaseTag("nextflow-io/nextflow", false)
-  t.is(result["tag_name"], expected)
-})
+/*
+  The whole reason this action exists is to handle the cases where a final
+  release is the "bleeding edge" release, rather than the "edge" release, even
+  though that's what the name would imply. Therefore, we need to test that the
+  'latest-everything' parameter can find the correct one regardless of whether
+  an "edge" release or a stable release is the true latest
+*/
+const release_filter_macro = test.macro(
+  async (
+    t,
+    input_version: string,
+    expected_version: string,
+    releases: NextflowRelease[]
+  ) => {
+    const matched_release = await functions.get_nextflow_release(
+      input_version,
+      releases
+    )
+    t.is(matched_release.versionNumber, expected_version)
+  }
+)
+test(
+  "Latest-everything install with newer edge release",
+  release_filter_macro,
+  "latest-everything",
+  "v23.09.1-edge",
+  edge_is_newer
+)
+test(
+  "Latest-everything install with older edge release",
+  release_filter_macro,
+  "latest-everything",
+  "v23.04.3",
+  edge_is_older
+)
+test(
+  "Latest-edge install with newer edge release",
+  release_filter_macro,
+  "latest-edge",
+  "v23.09.1-edge",
+  edge_is_newer
+)
+test(
+  "Latest-edge install with older edge release",
+  release_filter_macro,
+  "latest-edge",
+  "v23.03.0-edge",
+  edge_is_older
+)
+test(
+  "Latest-stable install with newer edge release",
+  release_filter_macro,
+  "latest",
+  "v23.04.3",
+  edge_is_newer
+)
+test(
+  "Latest-stable install with older edge release",
+  release_filter_macro,
+  "latest",
+  "v23.04.3",
+  edge_is_older
+)
+test(
+  "Fully versioned tag release",
+  release_filter_macro,
+  "v23.04.2",
+  "v23.04.2",
+  edge_is_newer
+)
+test(
+  "Partially versioned tag release",
+  release_filter_macro,
+  "v23.04",
+  "v23.04.3",
+  edge_is_newer
+)
 
-test.todo("nextflow_bin_url")
 test.todo("install_nextflow")