diff --git a/tests/game/formulas.test.ts b/tests/game/formulas.test.ts
index 2be632e..fdfa1fd 100644
--- a/tests/game/formulas.test.ts
+++ b/tests/game/formulas.test.ts
@@ -6,50 +6,13 @@ import Formula, {
     InvertibleFormula,
     unrefFormulaSource
 } from "game/formulas";
-import Decimal, { DecimalSource, format } from "util/bignum";
+import Decimal, { DecimalSource } from "util/bignum";
 import { beforeAll, describe, expect, test } from "vitest";
 import { ref } from "vue";
+import "../utils";
 
 type FormulaFunctions = keyof GenericFormula & keyof typeof Formula & keyof typeof Decimal;
 
-interface CustomMatchers<R = unknown> {
-    compare_tolerance(expected: DecimalSource): R;
-}
-
-declare global {
-    // eslint-disable-next-line @typescript-eslint/no-namespace
-    namespace Vi {
-        // eslint-disable-next-line @typescript-eslint/no-empty-interface
-        interface Assertion extends CustomMatchers {}
-        // eslint-disable-next-line @typescript-eslint/no-empty-interface
-        interface AsymmetricMatchersContaining extends CustomMatchers {}
-    }
-}
-
-expect.extend({
-    compare_tolerance(received: DecimalSource, expected: DecimalSource) {
-        const { isNot } = this;
-        let pass = false;
-        if (!Decimal.isFinite(expected)) {
-            pass = !Decimal.isFinite(received);
-        } else if (Decimal.isNaN(expected)) {
-            pass = Decimal.isNaN(received);
-        } else {
-            pass = Decimal.eq_tolerance(received, expected);
-        }
-        return {
-            // do not alter your "pass" based on isNot. Vitest does it for you
-            pass,
-            message: () =>
-                `Expected ${received} to${
-                    (isNot as boolean) ? " not" : ""
-                } be close to ${expected}`,
-            expected: format(expected),
-            actual: format(received)
-        };
-    }
-});
-
 const testValues = ["-1e400", 0, 0.25] as const;
 
 const invertibleZeroParamFunctionNames = [
diff --git a/tests/game/requirements.test.ts b/tests/game/requirements.test.ts
new file mode 100644
index 0000000..3a26dbc
--- /dev/null
+++ b/tests/game/requirements.test.ts
@@ -0,0 +1,182 @@
+import { Visibility } from "features/feature";
+import { createResource, Resource } from "features/resources/resource";
+import Formula from "game/formulas";
+import {
+    createBooleanRequirement,
+    createCostRequirement,
+    createVisibilityRequirement,
+    maxRequirementsMet,
+    payRequirements,
+    Requirement,
+    requirementsMet
+} from "game/requirements";
+import { beforeAll, describe, expect, test } from "vitest";
+import { isRef, ref, unref } from "vue";
+import "../utils";
+
+describe("Creating cost requirement", () => {
+    describe("Minimal requirement", () => {
+        let resource: Resource;
+        let requirement: Requirement;
+        beforeAll(() => {
+            resource = createResource(ref(10));
+            requirement = createCostRequirement(() => ({
+                resource,
+                cost: 10
+            }));
+        });
+
+        // eslint-disable-next-line @typescript-eslint/no-explicit-any
+        test("resource pass-through", () => (requirement as any).resource === resource);
+        // eslint-disable-next-line @typescript-eslint/no-explicit-any
+        test("cost pass-through", () => (requirement as any).cost === 10);
+
+        test("partialDisplay exists", () =>
+            requirement.partialDisplay != null && typeof requirement.partialDisplay === "function");
+        test("display exists", () =>
+            requirement.display != null && typeof requirement.display === "function");
+        test("pay exists", () => requirement.pay != null && typeof requirement.pay === "function");
+        test("requirementMet exists", () =>
+            requirement.requirementMet != null && isRef(requirement.requirementMet));
+        test("is visible", () => requirement.visibility === Visibility.Visible);
+        test("requires pay", () => requirement.requiresPay === true);
+        // eslint-disable-next-line @typescript-eslint/no-explicit-any
+        test("spends resources", () => (requirement as any).spendResources !== false);
+        // eslint-disable-next-line @typescript-eslint/no-explicit-any
+        test("does not buy max", () => (requirement as any).buyMax !== true);
+    });
+
+    describe("Fully customized", () => {
+        let resource: Resource;
+        let requirement: Requirement;
+        beforeAll(() => {
+            resource = createResource(ref(10));
+            requirement = createCostRequirement(() => ({
+                resource,
+                cost: 10,
+                visibility: Visibility.None,
+                requiresPay: false,
+                buyMax: true,
+                spendResources: false,
+                // eslint-disable-next-line @typescript-eslint/no-empty-function
+                pay() {}
+            }));
+        });
+
+        test("pay is empty function", () =>
+            requirement.pay != null &&
+            typeof requirement.pay === "function" &&
+            requirement.pay.length === 1);
+        test("is not visible", () => requirement.visibility === Visibility.None);
+        test("does not require pay", () => requirement.requiresPay === false);
+        // eslint-disable-next-line @typescript-eslint/no-explicit-any
+        test("does not spend resources", () => (requirement as any).spendResources);
+        // eslint-disable-next-line @typescript-eslint/no-explicit-any
+        test("buys max", () => (requirement as any).buyMax);
+    });
+
+    test("Requirement met when meeting the cost", () => {
+        const resource = createResource(ref(10));
+        const requirement = createCostRequirement(() => ({
+            resource,
+            cost: 10
+        }));
+        expect(unref(requirement.requirementMet)).toBe(true);
+    });
+
+    test("Requirement not met when not meeting the cost", () => {
+        const resource = createResource(ref(10));
+        const requirement = createCostRequirement(() => ({
+            resource,
+            cost: 100
+        }));
+        expect(unref(requirement.requirementMet)).toBe(false);
+    });
+});
+
+describe("Creating visibility requirement", () => {
+    test("Requirement met when visible", () => {
+        const requirement = createVisibilityRequirement({ visibility: Visibility.Visible });
+        expect(unref(requirement.requirementMet)).toBe(true);
+    });
+
+    test("Requirement not met when not visible", () => {
+        let requirement = createVisibilityRequirement({ visibility: Visibility.None });
+        expect(unref(requirement.requirementMet)).toBe(false);
+        requirement = createVisibilityRequirement({ visibility: Visibility.Hidden });
+        expect(unref(requirement.requirementMet)).toBe(false);
+    });
+});
+
+describe("Creating boolean requirement", () => {
+    test("Requirement met when true", () => {
+        const requirement = createBooleanRequirement(ref(true));
+        expect(unref(requirement.requirementMet)).toBe(true);
+    });
+
+    test("Requirement not met when false", () => {
+        const requirement = createBooleanRequirement(ref(false));
+        expect(unref(requirement.requirementMet)).toBe(false);
+    });
+});
+
+describe("Checking all requirements met", () => {
+    let metRequirement: Requirement;
+    let unmetRequirement: Requirement;
+    beforeAll(() => {
+        metRequirement = createBooleanRequirement(true);
+        unmetRequirement = createBooleanRequirement(false);
+    });
+
+    test("Returns true if no requirements", () => {
+        expect(requirementsMet([])).toBe(true);
+    });
+
+    test("Returns true if all requirements met", () => {
+        expect(requirementsMet([metRequirement, metRequirement])).toBe(true);
+    });
+
+    test("Returns false if any requirements unmet", () => {
+        expect(requirementsMet([metRequirement, unmetRequirement])).toBe(false);
+    });
+});
+
+describe("Checking maximum levels of requirements met", () => {
+    test("Returns 0 if any requirement is not met", () => {
+        const requirements = [
+            createBooleanRequirement(false),
+            createBooleanRequirement(true),
+            createCostRequirement(() => ({
+                resource: createResource(ref(10)),
+                cost: Formula.variable(0)
+            }))
+        ];
+        expect(maxRequirementsMet(requirements)).toBe(0);
+    });
+
+    test("Returns correct number of requirements met", () => {
+        const requirements = [
+            createBooleanRequirement(true),
+            createCostRequirement(() => ({
+                resource: createResource(ref(10)),
+                cost: Formula.variable(0)
+            }))
+        ];
+        expect(maxRequirementsMet(requirements)).toBe(10);
+    });
+});
+
+test("Paying requirements", () => {
+    const resource = createResource(ref(100));
+    const noPayment = createCostRequirement(() => ({
+        resource,
+        cost: 10,
+        requiresPay: false
+    }));
+    const payment = createCostRequirement(() => ({
+        resource,
+        cost: 10
+    }));
+    payRequirements([noPayment, payment]);
+    expect(resource.value).compare_tolerance(90);
+});
diff --git a/tests/utils.ts b/tests/utils.ts
new file mode 100644
index 0000000..0e58e19
--- /dev/null
+++ b/tests/utils.ts
@@ -0,0 +1,40 @@
+import Decimal, { DecimalSource, format } from "util/bignum";
+import { expect } from "vitest";
+
+interface CustomMatchers<R = unknown> {
+    compare_tolerance(expected: DecimalSource): R;
+}
+
+declare global {
+    // eslint-disable-next-line @typescript-eslint/no-namespace
+    namespace Vi {
+        // eslint-disable-next-line @typescript-eslint/no-empty-interface
+        interface Assertion extends CustomMatchers {}
+        // eslint-disable-next-line @typescript-eslint/no-empty-interface
+        interface AsymmetricMatchersContaining extends CustomMatchers {}
+    }
+}
+
+expect.extend({
+    compare_tolerance(received: DecimalSource, expected: DecimalSource) {
+        const { isNot } = this;
+        let pass = false;
+        if (!Decimal.isFinite(expected)) {
+            pass = !Decimal.isFinite(received);
+        } else if (Decimal.isNaN(expected)) {
+            pass = Decimal.isNaN(received);
+        } else {
+            pass = Decimal.eq_tolerance(received, expected);
+        }
+        return {
+            // do not alter your "pass" based on isNot. Vitest does it for you
+            pass,
+            message: () =>
+                `Expected ${received} to${
+                    (isNot as boolean) ? " not" : ""
+                } be close to ${expected}`,
+            expected: format(expected),
+            actual: format(received)
+        };
+    }
+});