diff --git a/src/entity-type.tests.ts b/src/entity-type.tests.ts
index 792481c..f4bd25c 100644
--- a/src/entity-type.tests.ts
+++ b/src/entity-type.tests.ts
@@ -3,66 +3,5 @@ import * as entityType from "./entity-type"
 import * as shared from "./shared.tests"
 
 describe(`entity type`, () => {
-  shared.run(shared.nonObjects, value => shared.rejects(
-    entityType.schema, value, `instance`, `is not of a type(s) object`
-  ))
-  describe(`unexpected properties`, () => shared.rejects(entityType.schema, {
-    singular: {},
-    plural: {},
-    label: [],
-    columns: {},
-    unexpected: {}
-  }, `instance`, `additionalProperty "unexpected" exists in instance when not allowed`))
-  describe(`singular`, () => {
-    describe(`missing`, () => shared.rejects(entityType.schema, {
-      plural: {},
-      label: [],
-      columns: {}
-    }, `instance`, `requires property "singular"`))
-    shared.testLocalizedString(entityType.schema, instance => ({
-      singular: instance,
-      plural: {},
-      label: [],
-      columns: {},
-    }), `instance.singular`)
-  })
-  describe(`plural`, () => {
-    describe(`missing`, () => shared.rejects(entityType.schema, {
-      singular: {},
-      label: [],
-      columns: {}
-    }, `instance`, `requires property "plural"`))
-    shared.testLocalizedString(entityType.schema, instance => ({
-      singular: {},
-      plural: instance,
-      label: [],
-      columns: {},
-    }), `instance.plural`)
-  })
-  describe(`label`, () => {
-    describe(`missing`, () => shared.rejects(entityType.schema, {
-      singular: {},
-      plural: {},
-      columns: {}
-    }, `instance`, `requires property "label"`))
-    shared.testLabel(entityType.schema, instance => ({
-      singular: {},
-      plural: {},
-      label: instance,
-      columns: {},
-    }), `instance.label`)
-  })
-  describe(`columns`, () => {
-    describe(`missing`, () => shared.rejects(entityType.schema, {
-      singular: {},
-      plural: {},
-      label: []
-    }, `instance`, `requires property "columns"`))
-    shared.testColumnSet(entityType.schema, instance => ({
-      singular: {},
-      plural: {},
-      label: [],
-      columns: instance,
-    }), `instance.columns`)
-  })
+  shared.testEntityType(entityType.schema, value => value, `instance`)
 })
diff --git a/src/shared.tests.ts b/src/shared.tests.ts
index ee41448..6ca5be1 100644
--- a/src/shared.tests.ts
+++ b/src/shared.tests.ts
@@ -820,3 +820,75 @@ export function testLabel(
     [`long_w`, `2thetp`, `wanna_`, `depest`, `lore__`]
   ])))
 }
+
+export function testEntityType(
+  schema: jsonschema.Schema,
+  instanceFactory: InstanceFactory,
+  property: string
+): void {
+  run(nonObjects, value => rejects(
+    schema, instanceFactory(value), property, `is not of a type(s) object`
+  ))
+  describe(`unexpected properties`, () => rejects(
+    schema,
+    instanceFactory({
+      singular: {},
+      plural: {},
+      label: [],
+      columns: {},
+      unexpected: {}
+    }), property, `additionalProperty "unexpected" exists in instance when not allowed`
+  ))
+  describe(`singular`, () => {
+    describe(`missing`, () => rejects(schema, instanceFactory({
+      plural: {},
+      label: [],
+      columns: {}
+    }), property, `requires property "singular"`))
+    testLocalizedString(schema, value => instanceFactory({
+      singular: value,
+      plural: {},
+      label: [],
+      columns: {},
+    }), `${property}.singular`)
+  })
+  describe(`plural`, () => {
+    describe(`missing`, () => rejects(schema, instanceFactory({
+      singular: {},
+      label: [],
+      columns: {}
+    }), property, `requires property "plural"`))
+    testLocalizedString(schema, value => instanceFactory({
+      singular: {},
+      plural: value,
+      label: [],
+      columns: {},
+    }), `${property}.plural`)
+  })
+  describe(`label`, () => {
+    describe(`missing`, () => rejects(schema, instanceFactory({
+      singular: {},
+      plural: {},
+      columns: {}
+    }), property, `requires property "label"`))
+    testLabel(schema, value => instanceFactory({
+      singular: {},
+      plural: {},
+      label: value,
+      columns: {},
+    }), `${property}.label`)
+  })
+  describe(`columns`, () => {
+    describe(`missing`, () => rejects(schema, instanceFactory({
+      singular: {},
+      plural: {},
+      label: []
+    }), property, `requires property "columns"`))
+    testColumnSet(schema, value => instanceFactory({
+      singular: {},
+      plural: {},
+      label: [],
+      columns: value,
+    }), `${property}.columns`)
+  })
+}