Add tests for metaschema context support

test/fixtures/context/duplicate/context.context

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+({
+  Nomen: { domain: 'Nomen' },
+});

test/fixtures/context/duplicate/custom.domains

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+({
+  Nomen: { type: 'string' },
+});

test/fixtures/context/duplicate/duplicateDomain.context

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+({
+  Nomen: { domain: 'Nomen' },
+});

test/fixtures/context/unresolved/context.context

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+({
+  Nomen: { domain: 'Nomen' },
+});

test/ms.context.js

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+'use strict';
+
+const metaschema = require('metaschema');
+const metatests = require('metatests');
+
+const { options, config } = require('../lib/metaschema-config/config');
+
+const { MetaschemaError, SchemaValidationError } = metaschema.errors;
+
+metatests.test('metaschema context error on duplicated domains', async test => {
+  await test.rejects(
+    metaschema.fs.load('test/fixtures/context/duplicate', options, config),
+    new MetaschemaError([
+      new SchemaValidationError('duplicate', 'duplicateDomain', {
+        type: 'domain',
+        value: 'Nomen',
+      }),
+    ])
+  );
+});
+
+metatests.test('metaschema context error on unresolved domain', async test => {
+  await test.rejects(
+    metaschema.fs.load('test/fixtures/context/unresolved', options, config),
+    new MetaschemaError([
+      new SchemaValidationError('unresolved', 'context.Nomen', {
+        type: 'domain',
+        value: 'Nomen',
+      }),
+    ])
+  );
+});