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diff --git a/test/unit/data/cacheable-object.js b/test/unit/data/cacheable-object.js
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+++ b/test/unit/data/cacheable-object.js
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+import t from 'tap';
+
+import {CacheableObject} from '#things';
+
+function newCacheableObject(PD) {
+  return new (class extends CacheableObject {
+    static propertyDescriptors = PD;
+  });
+}
+
+t.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);
+});
+
+t.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.equal(computeCount, 0);
+
+  obj.string = 'hello world';
+  t.equal(computeCount, 0);
+
+  obj.karkat;
+  t.equal(computeCount, 1);
+
+  obj.karkat;
+  t.equal(computeCount, 1);
+
+  obj.string = 'testing once again';
+  t.equal(computeCount, 1);
+
+  obj.karkat;
+  t.equal(computeCount, 2);
+
+  obj.string = 'testing once again';
+  t.equal(computeCount, 2);
+
+  obj.karkat;
+  t.equal(computeCount, 2);
+});
+
+t.test(`CacheableObject combined update & expose (no transform)`, t => {
+  const obj = newCacheableObject({
+    directory: {
+      flags: {
+        update: true,
+        expose: true
+      }
+    }
+  });
+
+  t.plan(2);
+
+  obj.directory = 'the-world-revolving';
+  t.equal(obj.directory, 'the-world-revolving');
+
+  obj.directory = 'chaos-king';
+  t.equal(obj.directory, 'chaos-king');
+});
+
+t.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.equal(obj.getsRepeated, 'dogdog');
+});
+
+t.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.equal(obj.customRepeat, 'dog');
+
+  obj.times = 5;
+  t.equal(obj.customRepeat, 'dogdogdogdogdog');
+
+  obj.customRepeat = 'cat';
+  t.equal(obj.customRepeat, 'catcatcatcatcat');
+});
+
+t.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.equal(obj.directory, 'megalovania');
+
+  try {
+    obj.directory = 25;
+  } catch (err) {
+    thrownError = err;
+  }
+
+  t.equal(thrownError, mockError);
+  t.equal(obj.directory, 'megalovania');
+
+  const date = new Date(`25 December 2009`);
+
+  obj.date = date;
+  t.equal(obj.date, date);
+
+  try {
+    obj.date = `TWELFTH PERIGEE'S EVE`;
+  } catch (err) {
+    thrownError = err;
+  }
+
+  t.equal(thrownError?.constructor, TypeError);
+  t.equal(obj.date, date);
+});
+
+t.test(`CacheableObject default update property value`, t => {
+  const obj = newCacheableObject({
+    fruit: {
+      flags: {
+        update: true,
+        expose: true
+      },
+
+      update: {
+        default: 'potassium'
+      }
+    }
+  });
+
+  t.plan(1);
+  t.equal(obj.fruit, 'potassium');
+});
+
+t.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.equal(thrownError, mockError);
+});