diff --git a/packages/dockview-core/src/__tests__/dnd/ghost.spec.ts b/packages/dockview-core/src/__tests__/dnd/ghost.spec.ts
new file mode 100644
index 000000000..32d978b2e
--- /dev/null
+++ b/packages/dockview-core/src/__tests__/dnd/ghost.spec.ts
@@ -0,0 +1,31 @@
+import { addGhostImage } from '../../dnd/ghost';
+
+describe('ghost', () => {
+    beforeEach(() => {
+        jest.useFakeTimers();
+        jest.clearAllTimers();
+    });
+
+    test('that a custom class is added, the element is added to the document and all is removed afterwards', () => {
+        const dataTransferMock = jest.fn<Partial<DataTransfer>, []>(() => {
+            return {
+                setDragImage: jest.fn(),
+            };
+        });
+
+        const element = document.createElement('div');
+        const dataTransfer = <DataTransfer>new dataTransferMock();
+
+        addGhostImage(dataTransfer, element);
+
+        expect(element.className).toBe('dv-dragged');
+        expect(element.parentElement).toBe(document.body);
+        expect(dataTransfer.setDragImage).toBeCalledTimes(1);
+        expect(dataTransfer.setDragImage).toBeCalledWith(element, 0, 0);
+
+        jest.runAllTimers();
+
+        expect(element.className).toBe('');
+        expect(element.parentElement).toBe(null);
+    });
+});
diff --git a/packages/dockview-core/src/dnd/ghost.ts b/packages/dockview-core/src/dnd/ghost.ts
index 04262544d..2ff9c569f 100644
--- a/packages/dockview-core/src/dnd/ghost.ts
+++ b/packages/dockview-core/src/dnd/ghost.ts
@@ -1,4 +1,4 @@
-import { addClasses } from '../dom';
+import { addClasses, removeClasses } from '../dom';
 
 export function addGhostImage(
     dataTransfer: DataTransfer,
@@ -11,6 +11,7 @@ export function addGhostImage(
     dataTransfer.setDragImage(ghostElement, 0, 0);
 
     setTimeout(() => {
+        removeClasses(ghostElement, 'dv-dragged');
         ghostElement.remove();
     }, 0);
 }
diff --git a/packages/dockview/src/__tests__/dockview/dockview.spec.tsx b/packages/dockview/src/__tests__/dockview/dockview.spec.tsx
new file mode 100644
index 000000000..0a9887e7b
--- /dev/null
+++ b/packages/dockview/src/__tests__/dockview/dockview.spec.tsx
@@ -0,0 +1,52 @@
+import * as React from 'react';
+import { render } from '@testing-library/react';
+import { DockviewApi } from 'dockview-core';
+import {
+    IDockviewPanelProps,
+    DockviewReact,
+    DockviewReadyEvent,
+} from '../../dockview/dockview';
+import { PanelCollection } from '../../types';
+import { setMockRefElement } from '../__test_utils__/utils';
+
+describe('gridview react', () => {
+    let components: PanelCollection<IDockviewPanelProps>;
+
+    beforeEach(() => {
+        components = {
+            default: (props: IDockviewPanelProps) => {
+                return <div>hello world</div>;
+            },
+        };
+    });
+
+    test('default', () => {
+        let api: DockviewApi | undefined;
+
+        const onReady = (event: DockviewReadyEvent) => {
+            api = event.api;
+        };
+
+        render(<DockviewReact components={components} onReady={onReady} />);
+
+        expect(api).toBeTruthy();
+    });
+
+    test('is sized to container', () => {
+        setMockRefElement({
+            clientHeight: 450,
+            clientWidth: 650,
+            appendChild: jest.fn(),
+        });
+        let api: DockviewApi | undefined;
+
+        const onReady = (event: DockviewReadyEvent) => {
+            api = event.api;
+        };
+
+        render(<DockviewReact components={components} onReady={onReady} />);
+
+        expect(api.width).toBe(650);
+        expect(api.height).toBe(450);
+    });
+});
diff --git a/packages/dockview/src/__tests__/dockview/groupControlsRenderer.spec.ts b/packages/dockview/src/__tests__/dockview/groupControlsRenderer.spec.ts
new file mode 100644
index 000000000..dc645d007
--- /dev/null
+++ b/packages/dockview/src/__tests__/dockview/groupControlsRenderer.spec.ts
@@ -0,0 +1,58 @@
+import {
+    DockviewGroupPanel,
+    DockviewGroupPanelApi,
+    DockviewGroupPanelModel,
+} from 'dockview-core';
+import { ReactGroupControlsRendererPart } from '../../dockview/groupControlsRenderer';
+
+describe('groupControlsRenderer', () => {
+    test('#1', () => {
+        const groupviewMock = jest.fn<Partial<DockviewGroupPanelModel>, []>(
+            () => {
+                return {
+                    onDidAddPanel: jest.fn(),
+                    onDidRemovePanel: jest.fn(),
+                    onDidActivePanelChange: jest.fn(),
+                };
+            }
+        );
+
+        const groupview = new groupviewMock() as DockviewGroupPanelModel;
+
+        const groupPanelMock = jest.fn<Partial<DockviewGroupPanel>, []>(() => {
+            return {
+                api: {} as DockviewGroupPanelApi as any,
+                model: groupview,
+            };
+        });
+
+        const groupPanel = new groupPanelMock() as DockviewGroupPanel;
+
+        const cut = new ReactGroupControlsRendererPart(
+            jest.fn(),
+            {
+                addPortal: jest.fn(),
+            },
+            groupPanel
+        );
+
+        expect(cut.element.childNodes.length).toBe(0);
+        expect(cut.element.className).toBe('dockview-react-part');
+        expect(cut.part).toBeUndefined();
+
+        cut.init({
+            containerApi: <any>jest.fn(),
+            api: <any>{
+                onDidActiveChange: jest.fn(),
+            },
+        });
+
+        const update = jest.fn();
+
+        jest.spyOn(cut.part!, 'update').mockImplementation(update);
+
+        cut.update({ params: { valueA: 'A' } });
+
+        expect(update).toBeCalledWith({ valueA: 'A' });
+    });
+});
diff --git a/packages/dockview/src/__tests__/gridview/gridview.spec.tsx b/packages/dockview/src/__tests__/gridview/gridview.spec.tsx
new file mode 100644
index 000000000..ac4c5c24e
--- /dev/null
+++ b/packages/dockview/src/__tests__/gridview/gridview.spec.tsx
@@ -0,0 +1,64 @@
+import * as React from 'react';
+import { render } from '@testing-library/react';
+import { GridviewApi, Orientation } from 'dockview-core';
+import {
+    IGridviewPanelProps,
+    GridviewReact,
+    GridviewReadyEvent,
+} from '../../gridview/gridview';
+import { PanelCollection } from '../../types';
+import { setMockRefElement } from '../__test_utils__/utils';
+
+describe('gridview react', () => {
+    let components: PanelCollection<IGridviewPanelProps>;
+
+    beforeEach(() => {
+        components = {
+            default: (props: IGridviewPanelProps) => {
+                return <div>hello world</div>;
+            },
+        };
+    });
+
+    test('default', () => {
+        let api: GridviewApi | undefined;
+
+        const onReady = (event: GridviewReadyEvent) => {
+            api = event.api;
+        };
+
+        render(
+            <GridviewReact
+                orientation={Orientation.VERTICAL}
+                components={components}
+                onReady={onReady}
+            />
+        );
+
+        expect(api).toBeTruthy();
+    });
+
+    test('is sized to container', () => {
+        setMockRefElement({
+            clientHeight: 450,
+            clientWidth: 650,
+            appendChild: jest.fn(),
+        });
+        let api: GridviewApi | undefined;
+
+        const onReady = (event: GridviewReadyEvent) => {
+            api = event.api;
+        };
+
+        render(
+            <GridviewReact
+                orientation={Orientation.VERTICAL}
+                components={components}
+                onReady={onReady}
+            />
+        );
+
+        expect(api.width).toBe(650);
+        expect(api.height).toBe(450);
+    });
+});
diff --git a/packages/dockview/src/__tests__/paneview/paneview.spec.tsx b/packages/dockview/src/__tests__/paneview/paneview.spec.tsx
new file mode 100644
index 000000000..0a69965f0
--- /dev/null
+++ b/packages/dockview/src/__tests__/paneview/paneview.spec.tsx
@@ -0,0 +1,52 @@
+import * as React from 'react';
+import { render } from '@testing-library/react';
+import { PaneviewApi } from 'dockview-core';
+import {
+    IPaneviewPanelProps,
+    PaneviewReact,
+    PaneviewReadyEvent,
+} from '../../paneview/paneview';
+import { PanelCollection } from '../../types';
+import { setMockRefElement } from '../__test_utils__/utils';
+
+describe('gridview react', () => {
+    let components: PanelCollection<IPaneviewPanelProps>;
+
+    beforeEach(() => {
+        components = {
+            default: (props: IPaneviewPanelProps) => {
+                return <div>hello world</div>;
+            },
+        };
+    });
+
+    test('default', () => {
+        let api: PaneviewApi | undefined;
+
+        const onReady = (event: PaneviewReadyEvent) => {
+            api = event.api;
+        };
+
+        render(<PaneviewReact components={components} onReady={onReady} />);
+
+        expect(api).toBeTruthy();
+    });
+
+    test('is sized to container', () => {
+        setMockRefElement({
+            clientHeight: 450,
+            clientWidth: 650,
+            appendChild: jest.fn(),
+        });
+        let api: PaneviewApi | undefined;
+
+        const onReady = (event: PaneviewReadyEvent) => {
+            api = event.api;
+        };
+
+        render(<PaneviewReact components={components} onReady={onReady} />);
+
+        expect(api.width).toBe(650);
+        expect(api.height).toBe(450);
+    });
+});
diff --git a/packages/dockview/src/__tests__/react.spec.tsx b/packages/dockview/src/__tests__/react.spec.tsx
new file mode 100644
index 000000000..2abf76845
--- /dev/null
+++ b/packages/dockview/src/__tests__/react.spec.tsx
@@ -0,0 +1,90 @@
+import { ReactPart } from '../react';
+import * as React from 'react';
+import { render, screen, act } from '@testing-library/react';
+
+interface TestInterface {
+    valueA: string;
+    valueB: number;
+}
+
+describe('react', () => {
+    describe('ReactPart', () => {
+        test('update underlying component via ReactPart class', () => {
+            let api: ReactPart<TestInterface>;
+
+            const onReady = (_api: ReactPart<TestInterface>) => {
+                api = _api;
+            };
+
+            render(<TestWrapper onReady={onReady} component={Component} />);
+
+            expect(api).toBeTruthy();
+
+            expect(screen.getByTestId('valueA').textContent).toBe('stringA');
+            expect(screen.getByTestId('valueB').textContent).toBe('42');
+
+            act(() => {
+                api.update({ valueB: '32' });
+            });
+
+            expect(screen.getByTestId('valueA').textContent).toBe('stringA');
+            expect(screen.getByTestId('valueB').textContent).toBe('32');
+
+            act(() => {
+                api.update({ valueA: 'anotherStringA', valueB: '22' });
+            });
+
+            expect(screen.getByTestId('valueA').textContent).toBe(
+                'anotherStringA'
+            );
+            expect(screen.getByTestId('valueB').textContent).toBe('22');
+        });
+    });
+});
+
+const Component = (props: TestInterface) => {
+    return (
+        <div>
+            <div data-testid="valueA">{props.valueA}</div>
+            <div data-testid="valueB">{props.valueB}</div>
+        </div>
+    );
+};
+
+const TestWrapper = (props: {
+    component: React.FunctionComponent<TestInterface>;
+    onReady: (api: ReactPart<TestInterface>) => void;
+}) => {
+    const [portal, setPortal] = React.useState<React.ReactPortal[]>([]);
+    const ref = React.useRef<HTMLDivElement>(null);
+
+    React.useEffect(() => {
+        const cut = new ReactPart<TestInterface>(
+            ref.current,
+            {
+                addPortal: (portal: React.ReactPortal) => {
+                    setPortal((_) => [..._, portal]);
+
+                    return {
+                        dispose: () => {
+                            setPortal((_) => _.filter((_) => _ !== portal));
+                        },
+                    };
+                },
+            },
+            props.component,
+            {
+                valueA: 'stringA',
+                valueB: 42,
+            }
+        );
+
+        props.onReady(cut);
+
+        return () => {
+            cut.dispose();
+        };
+    }, []);
+
+    return <div ref={ref}>{portal}</div>;
+};
diff --git a/packages/dockview/src/__tests__/splitview/splitview.spec.tsx b/packages/dockview/src/__tests__/splitview/splitview.spec.tsx
new file mode 100644
index 000000000..e0da9dd72
--- /dev/null
+++ b/packages/dockview/src/__tests__/splitview/splitview.spec.tsx
@@ -0,0 +1,64 @@
+import * as React from 'react';
+import { render } from '@testing-library/react';
+import { SplitviewApi, Orientation } from 'dockview-core';
+import {
+    ISplitviewPanelProps,
+    SplitviewReact,
+    SplitviewReadyEvent,
+} from '../../splitview/splitview';
+import { PanelCollection } from '../../types';
+import { setMockRefElement } from '../__test_utils__/utils';
+
+describe('splitview react', () => {
+    let components: PanelCollection<ISplitviewPanelProps>;
+
+    beforeEach(() => {
+        components = {
+            default: (props: ISplitviewPanelProps) => {
+                return <div>hello world</div>;
+            },
+        };
+    });
+
+    test('default', () => {
+        let api: SplitviewApi | undefined;
+
+        const onReady = (event: SplitviewReadyEvent) => {
+            api = event.api;
+        };
+
+        render(
+            <SplitviewReact
+                orientation={Orientation.VERTICAL}
+                components={components}
+                onReady={onReady}
+            />
+        );
+
+        expect(api).toBeTruthy();
+    });
+
+    test('is sized to container', () => {
+        setMockRefElement({
+            clientHeight: 450,
+            clientWidth: 650,
+            appendChild: jest.fn(),
+        });
+        let api: SplitviewApi | undefined;
+
+        const onReady = (event: SplitviewReadyEvent) => {
+            api = event.api;
+        };
+
+        render(
+            <SplitviewReact
+                orientation={Orientation.VERTICAL}
+                components={components}
+                onReady={onReady}
+            />
+        );
+
+        expect(api.width).toBe(650);
+        expect(api.height).toBe(450);
+    });
+});