diff --git a/src/shared/lib/store/createControlStore/createControlStore.test.ts b/src/shared/lib/store/createControlStore/createControlStore.test.ts
new file mode 100644
index 0000000..fb9ce03
--- /dev/null
+++ b/src/shared/lib/store/createControlStore/createControlStore.test.ts
@@ -0,0 +1,89 @@
+import { get } from 'svelte/store';
+import {
+    beforeEach,
+    describe,
+    expect,
+    it,
+} from 'vitest';
+import {
+    type ControlModel,
+    createControlStore,
+} from './createControlStore';
+
+describe('createControlStore', () => {
+    let store: ReturnType<typeof createControlStore<number>>;
+
+    beforeEach(() => {
+        const initialState: ControlModel<number> = {
+            value: 10,
+            min: 0,
+            max: 100,
+            step: 5,
+        };
+        store = createControlStore(initialState);
+    });
+
+    it('initializes with correct state', () => {
+        expect(get(store)).toEqual({
+            value: 10,
+            min: 0,
+            max: 100,
+            step: 5,
+        });
+    });
+
+    it('increases value by step', () => {
+        store.increase();
+        expect(get(store).value).toBe(15);
+    });
+
+    it('decreases value by step', () => {
+        store.decrease();
+        expect(get(store).value).toBe(5);
+    });
+
+    it('clamps value at maximum', () => {
+        store.setValue(200);
+        expect(get(store).value).toBe(100);
+    });
+
+    it('clamps value at minimum', () => {
+        store.setValue(-10);
+        expect(get(store).value).toBe(0);
+    });
+
+    it('rounds to step precision', () => {
+        store.setValue(12.34);
+        // With step=5, 12.34 is clamped and rounded to nearest integer (0 decimal places)
+        expect(get(store).value).toBe(12);
+    });
+
+    it('handles decimal steps correctly', () => {
+        const decimalStore = createControlStore({
+            value: 1.0,
+            min: 0,
+            max: 2,
+            step: 0.05,
+        });
+        decimalStore.increase();
+        expect(get(decimalStore).value).toBe(1.05);
+    });
+
+    it('isAtMax returns true when at maximum', () => {
+        store.setValue(100);
+        expect(store.isAtMax()).toBe(true);
+    });
+
+    it('isAtMax returns false when not at maximum', () => {
+        expect(store.isAtMax()).toBe(false);
+    });
+
+    it('isAtMin returns true when at minimum', () => {
+        store.setValue(0);
+        expect(store.isAtMin()).toBe(true);
+    });
+
+    it('isAtMin returns false when not at minimum', () => {
+        expect(store.isAtMin()).toBe(false);
+    });
+});
diff --git a/src/shared/lib/store/createFilterStore/createFilterStore.test.ts b/src/shared/lib/store/createFilterStore/createFilterStore.test.ts
new file mode 100644
index 0000000..3b94235
--- /dev/null
+++ b/src/shared/lib/store/createFilterStore/createFilterStore.test.ts
@@ -0,0 +1,136 @@
+import { get } from 'svelte/store';
+import {
+    beforeEach,
+    describe,
+    expect,
+    it,
+} from 'vitest';
+import {
+    type FilterModel,
+    type Property,
+    createFilterStore,
+} from './createFilterStore';
+
+describe('createFilterStore', () => {
+    const mockProperties: Property[] = [
+        { id: '1', name: 'Sans-serif', selected: false },
+        { id: '2', name: 'Serif', selected: false },
+        { id: '3', name: 'Display', selected: false },
+    ];
+
+    let store: ReturnType<typeof createFilterStore>;
+
+    beforeEach(() => {
+        const initialState: FilterModel = {
+            searchQuery: '',
+            properties: mockProperties,
+        };
+        store = createFilterStore(initialState);
+    });
+
+    it('initializes with correct state', () => {
+        const state = get(store);
+        expect(state).toEqual({
+            searchQuery: '',
+            properties: mockProperties,
+        });
+    });
+
+    it('sets search query', () => {
+        store.setSearchQuery('serif');
+        const state = get(store);
+        expect(state.searchQuery).toBe('serif');
+    });
+
+    it('clears search query', () => {
+        store.setSearchQuery('test');
+        store.clearSearchQuery();
+        const state = get(store);
+        expect(state.searchQuery).toBeUndefined();
+    });
+
+    it('selects a property', () => {
+        store.selectProperty('1');
+        const state = get(store);
+        const property = state.properties.find(p => p.id === '1');
+        expect(property?.selected).toBe(true);
+    });
+
+    it('deselects a property', () => {
+        store.selectProperty('1');
+        store.deselectProperty('1');
+        const state = get(store);
+        const property = state.properties.find(p => p.id === '1');
+        expect(property?.selected).toBe(false);
+    });
+
+    it('toggles property from unselected to selected', () => {
+        store.toggleProperty('1');
+        const state = get(store);
+        const property = state.properties.find(p => p.id === '1');
+        expect(property?.selected).toBe(true);
+    });
+
+    it('toggles property from selected to unselected', () => {
+        store.selectProperty('1');
+        store.toggleProperty('1');
+        const state = get(store);
+        const property = state.properties.find(p => p.id === '1');
+        expect(property?.selected).toBe(false);
+    });
+
+    it('selects all properties', () => {
+        store.selectAllProperties();
+        const state = get(store);
+        expect(state.properties.every(p => p.selected)).toBe(true);
+    });
+
+    it('deselects all properties', () => {
+        store.selectAllProperties();
+        store.deselectAllProperties();
+        const state = get(store);
+        expect(state.properties.every(p => !p.selected)).toBe(true);
+    });
+
+    it('gets all properties', () => {
+        const allProps = store.getAllProperties();
+        const props = get(allProps);
+        expect(props).toEqual(mockProperties);
+    });
+
+    it('gets selected properties', () => {
+        store.selectProperty('1');
+        store.selectProperty('3');
+        const selectedProps = store.getSelectedProperties();
+        const props = get(selectedProps);
+        expect(props).toHaveLength(2);
+        expect(props?.[0].id).toBe('1');
+        expect(props?.[1].id).toBe('3');
+    });
+
+    it('filters properties by search query', () => {
+        store.setSearchQuery('serif');
+        const filteredProps = store.getFilteredProperties();
+        const props = get(filteredProps);
+        // 'serif' is a substring of 'Sans-serif' (case-sensitive match)
+        expect(props).toHaveLength(1);
+        expect(props?.[0].id).toBe('1');
+    });
+
+    it('filter is case-sensitive', () => {
+        store.setSearchQuery('San');
+        const filteredProps = store.getFilteredProperties();
+        const props = get(filteredProps);
+        // 'San' matches 'Sans-serif' exactly (case-sensitive)
+        expect(props).toHaveLength(1);
+        expect(props?.[0].id).toBe('1');
+    });
+
+    it('filter returns all properties when query is empty', () => {
+        store.setSearchQuery('');
+        const filteredProps = store.getFilteredProperties();
+        let props: Property[] | undefined = undefined;
+        filteredProps.subscribe(p => (props = p))();
+        expect(props).toHaveLength(3);
+    });
+});
diff --git a/src/shared/lib/store/index.ts b/src/shared/lib/store/index.ts
new file mode 100644
index 0000000..f94a02a
--- /dev/null
+++ b/src/shared/lib/store/index.ts
@@ -0,0 +1,18 @@
+/**
+ * Shared store exports
+ *
+ * Exports all store creators and types for Svelte 5 reactive state management
+ */
+
+export { createFilterStore } from './createFilterStore/createFilterStore';
+export type {
+    FilterModel,
+    FilterStore,
+    Property,
+} from './createFilterStore/createFilterStore';
+
+export { createControlStore } from './createControlStore/createControlStore';
+export type {
+    ControlModel,
+    ControlStoreModel,
+} from './createControlStore/createControlStore';