fix(adapters): improved adapters loading logic to have clear error messages; (#5919)

test/unit/adapters/adapters.js

@@ -0,0 +1,48 @@
+import adapters from '../../../lib/adapters/adapters.js';
+import assert from 'assert';
+
+
+describe('adapters', function () {
+  const store = {...adapters.adapters};
+
+  beforeEach(() => {
+    Object.keys(adapters.adapters).forEach((name) => {
+      delete adapters.adapters[name];
+    });
+
+    Object.assign(adapters.adapters, store);
+  });
+
+  it('should support loading by fn handle', function () {
+    const adapter = () => {};
+    assert.strictEqual(adapters.getAdapter(adapter), adapter);
+  });
+
+  it('should support loading by name', function () {
+    const adapter = () => {};
+    adapters.adapters['testadapter'] = adapter;
+    assert.strictEqual(adapters.getAdapter('testAdapter'), adapter);
+  });
+
+  it('should detect adapter unavailable status', function () {
+    adapters.adapters['testadapter'] = null;
+    assert.throws(()=> adapters.getAdapter('testAdapter'), /is not available in the build/)
+  });
+
+  it('should detect adapter unsupported status', function () {
+    adapters.adapters['testadapter'] = false;
+    assert.throws(()=> adapters.getAdapter('testAdapter'), /is not supported by the environment/)
+  });
+
+  it('should pick suitable adapter from the list', function () {
+    const adapter = () => {};
+
+    Object.assign(adapters.adapters, {
+      foo: false,
+      bar: null,
+      baz: adapter
+    });
+
+    assert.strictEqual(adapters.getAdapter(['foo', 'bar', 'baz']), adapter);
+  });
+});