diff --git a/test/input-utils.test.ts b/test/input-utils.test.ts
new file mode 100644
index 0000000..d469b40
--- /dev/null
+++ b/test/input-utils.test.ts
@@ -0,0 +1,67 @@
+import { describe, test, expect, beforeAll, afterAll } from "@jest/globals";
+import { setupInput, unsetInput } from "./utils/input-utils";
+import { getInputAsObject } from "../src/utils/input-utils";
+
+describe("getInputAsObject", () => {
+    beforeAll(() => setupInput({
+        "boolean": true,
+        "object": { foo: "bar" },
+        "number": 1,
+        "array": ["foo", "bar"],
+
+        "files-primary": "primaryPath",
+        "files-secondary": "secondaryPath",
+        "files-secondary-inner": "innerSecondaryPath",
+        "files": "path",
+
+        "modrinth-id": 42,
+        "modrinth-token": "1234",
+        "modrinth-files-primary": "primaryPath",
+        "modrinth-files-secondary": "secondaryPath",
+
+        "This is a Very--Long_Name!": "foo"
+    }));
+    afterAll(() => unsetInput());
+
+    test("input object contains only strings", () => {
+        const input = getInputAsObject();
+        expect(input).toHaveProperty("boolean", "true");
+        expect(input).toHaveProperty("object", {}.toString());
+        expect(input).not.toHaveProperty("object.foo");
+        expect(input).toHaveProperty("number", "1");
+        expect(input).toHaveProperty("array", ["foo", "bar"].toString());
+    });
+
+    test("property names are converted to paths inside of the input object (a-b -> a.b and aB)", () => {
+        const input = getInputAsObject();
+        expect(input).toHaveProperty("modrinth.id", "42");
+        expect(input).toHaveProperty("modrinthId", "42");
+
+        expect(input).toHaveProperty("modrinth.token", "1234");
+        expect(input).toHaveProperty("modrinthToken", "1234");
+
+        expect(input).toHaveProperty("modrinth.files.primary", "primaryPath");
+        expect(input).toHaveProperty("modrinth.filesPrimary", "primaryPath");
+        expect(input).toHaveProperty("modrinthFilesPrimary", "primaryPath");
+
+        expect(input).toHaveProperty("modrinth.files.secondary", "secondaryPath");
+        expect(input).toHaveProperty("modrinth.filesSecondary", "secondaryPath");
+        expect(input).toHaveProperty("modrinthFilesSecondary", "secondaryPath");
+    });
+
+    test("string values do not have additional properties", () => {
+        const input = getInputAsObject();
+        expect(input).toHaveProperty("files", "path");
+        expect(input).toHaveProperty("filesPrimary", "primaryPath");
+        expect(input).toHaveProperty("filesSecondary", "secondaryPath");
+        expect(input).toHaveProperty("filesSecondaryInner", "innerSecondaryPath");
+        expect(input).not.toHaveProperty("files.primary");
+        expect(input).not.toHaveProperty("files.secondary");
+    });
+
+    test("input object does not have empty property names", () => {
+        const input = getInputAsObject();
+        expect(input).toHaveProperty("this.is.a.very.long.name", "foo");
+        expect(input).toHaveProperty("thisIsAVeryLongName", "foo");
+    });
+});
diff --git a/test/utils/input-utils.ts b/test/utils/input-utils.ts
new file mode 100644
index 0000000..3ca4dc2
--- /dev/null
+++ b/test/utils/input-utils.ts
@@ -0,0 +1,15 @@
+import process from "process";
+
+export function setupInput(input: Record<string, any>): void {
+    for (const [key, value] of Object.entries(input)) {
+        process.env[`INPUT_${key.replace(/ /g, "_").toUpperCase()}`] = value.toString();
+    }
+}
+
+export function unsetInput(): void {
+    for (const key of Object.keys(process.env)) {
+        if (key.startsWith("INPUT_")) {
+            delete process.env[key];
+        }
+    }
+}