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diff --git a/test/cacheable-object.js b/test/cacheable-object.js
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+++ b/test/cacheable-object.js
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+import test from 'tape';
+
+import CacheableObject from '../src/thing/cacheable-object.js';
+
+// Utility
+
+function newCacheableObject(PD) {
+    return new (class extends CacheableObject {
+        static propertyDescriptors = PD;
+    });
+}
+
+// Tests
+
+test(`CacheableObject simple separate update & expose`, t => {
+    const obj = newCacheableObject({
+        number: {
+            flags: {
+                update: true
+            }
+        },
+
+        timesTwo: {
+            flags: {
+                expose: true
+            },
+
+            expose: {
+                dependencies: ['number'],
+                compute: ({ number }) => number * 2
+            }
+        }
+    });
+
+    t.plan(1);
+    obj.number = 5;
+    t.equal(obj.timesTwo, 10);
+});
+
+test(`CacheableObject basic cache behavior`, t => {
+    let computeCount = 0;
+
+    const obj = newCacheableObject({
+        string: {
+            flags: {
+                update: true
+            }
+        },
+
+        karkat: {
+            flags: {
+                expose: true
+            },
+
+            expose: {
+                dependencies: ['string'],
+                compute: ({ string }) => {
+                    computeCount++;
+                    return string.toUpperCase();
+                }
+            }
+        }
+    });
+
+    t.plan(8);
+
+    t.is(computeCount, 0);
+
+    obj.string = 'hello world';
+    t.is(computeCount, 0);
+
+    obj.karkat;
+    t.is(computeCount, 1);
+
+    obj.karkat;
+    t.is(computeCount, 1);
+
+    obj.string = 'testing once again';
+    t.is(computeCount, 1);
+
+    obj.karkat;
+    t.is(computeCount, 2);
+
+    obj.string = 'testing once again';
+    t.is(computeCount, 2);
+
+    obj.karkat;
+    t.is(computeCount, 2);
+});
+
+test(`CacheableObject combined update & expose (no transform)`, t => {
+    const obj = newCacheableObject({
+        directory: {
+            flags: {
+                update: true,
+                expose: true
+            }
+        }
+    });
+
+    t.plan(2);
+
+    t.directory = 'the-world-revolving';
+    t.is(t.directory, 'the-world-revolving');
+
+    t.directory = 'chaos-king';
+    t.is(t.directory, 'chaos-king');
+});
+
+test(`CacheableObject combined update & expose (basic transform)`, t => {
+    const obj = newCacheableObject({
+        getsRepeated: {
+            flags: {
+                update: true,
+                expose: true
+            },
+
+            expose: {
+                transform: value => value.repeat(2)
+            }
+        }
+    });
+
+    t.plan(1);
+
+    obj.getsRepeated = 'dog';
+    t.is(obj.getsRepeated, 'dogdog');
+});
+
+test(`CacheableObject combined update & expose (transform with dependency)`, t => {
+    const obj = newCacheableObject({
+        customRepeat: {
+            flags: {
+                update: true,
+                expose: true
+            },
+
+            expose: {
+                dependencies: ['times'],
+                transform: (value, { times }) => value.repeat(times)
+            }
+        },
+
+        times: {
+            flags: {
+                update: true
+            }
+        }
+    });
+
+    t.plan(3);
+
+    obj.customRepeat = 'dog';
+    obj.times = 1;
+    t.is(obj.customRepeat, 'dog');
+
+    obj.times = 5;
+    t.is(obj.customRepeat, 'dogdogdogdogdog');
+
+    obj.customRepeat = 'cat';
+    t.is(obj.customRepeat, 'catcatcatcatcat');
+});
+
+test(`CacheableObject validate on update`, t => {
+    const mockError = new TypeError(`Expected a string, not ${typeof value}`);
+
+    const obj = newCacheableObject({
+        directory: {
+            flags: {
+                update: true,
+                expose: true
+            },
+
+            update: {
+                validate: value => {
+                    if (typeof value !== 'string') {
+                        throw mockError;
+                    }
+                    return true;
+                }
+            }
+        },
+
+        date: {
+            flags: {
+                update: true,
+                expose: true
+            },
+
+            update: {
+                validate: value => (value instanceof Date)
+            }
+        }
+    });
+
+    let thrownError;
+    t.plan(6);
+
+    obj.directory = 'megalovania';
+    t.is(obj.directory, 'megalovania');
+
+    try {
+        obj.directory = 25;
+    } catch (err) {
+        thrownError = err;
+    }
+
+    t.is(thrownError, mockError);
+    t.is(obj.directory, 'megalovania');
+
+    const date = new Date(`25 December 2009`);
+
+    obj.date = date;
+    t.is(obj.date, date);
+
+    try {
+        obj.date = `TWELFTH PERIGEE'S EVE`;
+    } catch (err) {
+        thrownError = err;
+    }
+
+    t.is(thrownError?.constructor, TypeError);
+    t.is(obj.date, date);
+});
+
+test(`CacheableObject default update property value`, t => {
+    const obj = newCacheableObject({
+        fruit: {
+            flags: {
+                update: true,
+                expose: true
+            },
+
+            update: {
+                default: 'potassium'
+            }
+        }
+    });
+
+    t.plan(1);
+    t.is(obj.fruit, 'potassium');
+});
+
+test(`CacheableObject default property throws if invalid`, t => {
+    const mockError = new TypeError(`Expected a string, not ${typeof value}`);
+
+    t.plan(1);
+
+    let thrownError;
+
+    try {
+        newCacheableObject({
+            string: {
+                flags: {
+                    update: true
+                },
+
+                update: {
+                    default: 123,
+                    validate: value => {
+                        if (typeof value !== 'string') {
+                            throw mockError;
+                        }
+                        return true;
+                    }
+                }
+            }
+        });
+    } catch (err) {
+        thrownError = err;
+    }
+
+    t.is(thrownError, mockError);
+});