diff --git a/src/features/settings/utils/__tests__/settingsValidator.test.js b/src/features/settings/utils/__tests__/settingsValidator.test.js
new file mode 100644
index 0000000..5f30729
--- /dev/null
+++ b/src/features/settings/utils/__tests__/settingsValidator.test.js
@@ -0,0 +1,699 @@
+/*
+Copyright 2026 Seekra
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import { describe, test, expect } from 'vitest';
+import { validateSettingsConfig, validateEntry, validateSelectionOptions, assertType, assertString } from '../settingsValidator';
+
+describe('validateSettingsConfig', () => {
+    test.for([
+        { raw: false, expected: false },
+        { raw: true, expected: false },
+        { raw: 0, expected: false },
+        { raw: 42, expected: false },
+        { raw: '', expected: false },
+        { raw: ' ', expected: false },
+        { raw: 'a', expected: false },
+        { raw: {}, expected: false },
+        { raw: {
+            contents: []
+        }, expected: true },
+        { raw: {
+            contents: [
+                {
+                    type: 'section',
+                    name: 'general',
+                    i18n: 'settings.settings.general',
+                    content: [
+                        {
+                            type: 'bool',
+                            name: 'Enable feature 42',
+                            i18n: 'settings.settings.general.enableFeature42'
+                        }
+                    ]
+                }
+            ]
+        }, expected: true },
+        { raw: {
+            contents: [
+                {
+                    type: 'section',
+                    name: 'general',
+                    i18n: 'settings.settings.general',
+                    content: [
+                        {
+                            type: 'bool',
+                            name: 'Enable feature 42',
+                            i18n: 'settings.settings.general.enableFeature42'
+                        }
+                    ]
+                },
+                {
+                    type: 'section',
+                    name: 'copyOfGeneral',
+                    i18n: 'settings.settings.copyOfGeneral',
+                    content: [
+                        {
+                            type: 'bool',
+                            name: 'Enable feature 42',
+                            i18n: 'settings.settings.general.enableFeature42'
+                        }
+                    ]
+                },
+            ]
+        }, expected: true },
+        { raw: {
+            contents: [
+                {
+                    type: 'section',
+                    name: 'general',
+                    i18n: 'settings.settings.general',
+                    content: [
+                        {
+                            type: 'bool',
+                            name: 'Enable feature 42',
+                            i18n: 'settings.settings.general.enableFeature42'
+                        }
+                    ]
+                },
+                {
+                    type: 'section',
+                    name: 'copyOfGeneral',
+                    i18n: 'settings.settings.copyOfGeneral',
+                    content: [
+                        {
+                            type: 'bool',
+                            name: 'Enable feature 42',
+                            default: false,
+                            i18n: 'settings.settings.general.enableFeature42'
+                        }
+                    ]
+                },
+                {
+                    type: 'section',
+                    name: 'aSection',
+                    i18n: 'settings.settings.aSection',
+                    content: [
+                        {
+                            type: 'bool',
+                            name: 'Enable feature 43',
+                            i18n: 'settings.settings.aSection.enableFeature43'
+                        },
+                        {
+                            type: 'selection',
+                            name: 'language',
+                            i18n: 'settings.settings.aSection.language.label',
+                            default: 'en',
+                            options: [
+                                { name: 'en', i18n: 'settings.settings.aSection.language.options.en' },
+                                { name: 'de', i18n: 'settings.settings.aSection.language.options.de' },
+                            ]
+                        },
+                        {
+                            type: 'section',
+                            name: 'section2',
+                            i18n: 'settings.settings.aSection.section2.label',
+                            content: [
+                                {
+                                    type: 'string',
+                                    name: 'string',
+                                    i18n: 'settings.settings.aSection.sections.string',
+                                    default: 'str'
+                                }
+                            ]
+                        },
+                    ]
+                },
+            ]
+        }, expected: true },
+        { raw: {
+            contents: [
+                {
+                    type: 'section',
+                    name: 'general',
+                    i18n: 'settings.settings.general',
+                    content: [
+                        {
+                            type: 'bool',
+                            name: 'Enable feature 42',
+                            i18n: 'settings.settings.general.enableFeature42'
+                        }
+                    ]
+                },
+                {
+                    type: 'section',
+                    name: 'copyOfGeneral',
+                    i18n: 'settings.settings.copyOfGeneral',
+                    content: [
+                        {
+                            type: 'bool',
+                            name: 'Enable feature 42',
+                            default: false,
+                            i18n: 'settings.settings.general.enableFeature42'
+                        }
+                    ]
+                },
+                {
+                    type: 'section',
+                    name: 'aSection',
+                    i18n: 'settings.settings.aSection',
+                    content: [
+                        {
+                            type: 'bool',
+                            name: 'Enable feature 43',
+                            i18n: 'settings.settings.aSection.enableFeature43'
+                        },
+                        {
+                            type: 'selection',
+                            name: 'language',
+                            i18n: 'settings.settings.aSection.language.label',
+                            default: 'en',
+                            allowMultiple: false,
+                            options: [
+                                { name: 'en', i18n: 'settings.settings.aSection.language.options.en' },
+                                { name: 'de', i18n: 'settings.settings.aSection.language.options.de' },
+                            ]
+                        },
+                        {
+                            type: 'section',
+                            name: 'section2',
+                            i18n: 'settings.settings.aSection.section2.label',
+                            content: [
+                                {
+                                    type: 'string',
+                                    name: 'string',
+                                    i18n: 'settings.settings.aSection.sections.string',
+                                    default: 'str'
+                                }
+                            ]
+                        },
+                    ]
+                },
+            ]
+        }, expected: true },
+        { raw: {
+            contents: [
+                {
+                    type: 'section',
+                    name: 'general',
+                    i18n: 'settings.settings.general',
+                    content: [
+                        {
+                            type: 'bool',
+                            name: 'Enable feature 42',
+                            i18n: 'settings.settings.general.enableFeature42'
+                        }
+                    ]
+                },
+                {
+                    type: 'section',
+                    name: 'copyOfGeneral',
+                    i18n: 'settings.settings.copyOfGeneral',
+                    content: [
+                        {
+                            type: 'bool',
+                            name: 'Enable feature 42',
+                            default: false,
+                            i18n: 'settings.settings.general.enableFeature42'
+                        }
+                    ]
+                },
+                {
+                    type: 'section',
+                    name: 'aSection',
+                    i18n: 'settings.settings.aSection',
+                    content: [
+                        {
+                            type: 'bool',
+                            name: 'Enable feature 43',
+                            i18n: 'settings.settings.aSection.enableFeature43',
+                            default: 'true'
+                        },
+                        {
+                            type: 'selection',
+                            name: 'language',
+                            i18n: 'settings.settings.aSection.language.label',
+                            default: 'en',
+                            options: [
+                                { name: 'en', i18n: 'settings.settings.aSection.language.options.en' },
+                                { name: 'de', i18n: 'settings.settings.aSection.language.options.de' },
+                            ]
+                        },
+                        {
+                            type: 'section',
+                            name: 'section2',
+                            i18n: 'settings.settings.aSection.section2.label',
+                            content: [
+                                {
+                                    type: 'string',
+                                    name: 'string',
+                                    i18n: 'settings.settings.aSection.sections.string',
+                                    default: 42
+                                }
+                            ]
+                        },
+                    ]
+                },
+            ]
+        }, expected: false },
+        { raw: {
+            content: [
+                {
+                    type: 'section',
+                    name: 'general',
+                    i18n: 'settings.settings.general',
+                    content: [
+                        {
+                            type: 'bool',
+                            name: 'Enable feature 42',
+                            i18n: 'settings.settings.general.enableFeature42'
+                        }
+                    ]
+                },
+                {
+                    type: 'section',
+                    name: 'copyOfGeneral',
+                    i18n: 'settings.settings.copyOfGeneral',
+                    content: [
+                        {
+                            type: 'bool',
+                            name: 'Enable feature 42',
+                            default: false,
+                            i18n: 'settings.settings.general.enableFeature42'
+                        }
+                    ]
+                },
+                {
+                    type: 'section',
+                    name: 'aSection',
+                    i18n: 'settings.settings.aSection',
+                    content: [
+                        {
+                            type: 'bool',
+                            name: 'Enable feature 43',
+                            i18n: 'settings.settings.aSection.enableFeature43'
+                        },
+                        {
+                            type: 'selection',
+                            name: 'language',
+                            i18n: 'settings.settings.aSection.language.label',
+                            default: 'en',
+                            options: [
+                                { name: 'en', i18n: 'settings.settings.aSection.language.options.en' },
+                                { name: 'de', i18n: 'settings.settings.aSection.language.options.de' },
+                            ]
+                        },
+                        {
+                            type: 'section',
+                            name: 'section2',
+                            i18n: 'settings.settings.aSection.section2.label',
+                            content: [
+                                {
+                                    type: 'string',
+                                    name: 'string',
+                                    i18n: 'settings.settings.aSection.sections.string',
+                                    default: 'str'
+                                }
+                            ]
+                        },
+                    ]
+                },
+            ]
+        }, expected: false },
+        { raw: {
+            content: [
+                {
+                    type: 'sectio',
+                    name: 'general',
+                    i18n: 'settings.settings.general',
+                    content: [
+                        {
+                            type: 'bool',
+                            name: 'Enable feature 42',
+                            i18n: 'settings.settings.general.enableFeature42'
+                        }
+                    ]
+                },
+                {
+                    type: 'section',
+                    name: 'copyOfGeneral',
+                    i18n: 'settings.settings.copyOfGeneral',
+                    content: [
+                        {
+                            type: 'bool',
+                            name: 'Enable feature 42',
+                            default: false,
+                            i18n: 'settings.settings.general.enableFeature42'
+                        }
+                    ]
+                },
+                {
+                    type: 'section',
+                    name: 'aSection',
+                    i18n: 'settings.settings.aSection',
+                    content: [
+                        {
+                            type: 'bool',
+                            name: 'Enable feature 43',
+                            i18n: 'settings.settings.aSection.enableFeature43'
+                        },
+                        {
+                            type: 'selection',
+                            name: 'language',
+                            i18n: 'settings.settings.aSection.language.label',
+                            default: 'en',
+                            options: [
+                                { name: 'en', i18n: 'settings.settings.aSection.language.options.en' },
+                                { name: 'de', i18n: 'settings.settings.aSection.language.options.de' },
+                            ]
+                        },
+                        {
+                            type: 'section',
+                            name: 'section2',
+                            i18n: 'settings.settings.aSection.section2.label',
+                            content: [
+                                {
+                                    type: 'string',
+                                    name: 'string',
+                                    i18n: 'settings.settings.aSection.sections.string',
+                                    default: 'str'
+                                }
+                            ]
+                        },
+                    ]
+                },
+            ]
+        }, expected: false },
+        { raw: {
+            content: [
+                {
+                    type: 'sectio',
+                    name: 'general',
+                    i18n: 'settings.settings.general',
+                    content: [
+                        {
+                            type: 'bool',
+                            name: 'Enable feature 42',
+                            i18n: 'settings.settings.general.enableFeature42'
+                        }
+                    ]
+                },
+                {
+                    type: 'section',
+                    name: 'copyOfGeneral',
+                    i18n: 'settings.settings.copyOfGeneral',
+                    content: [
+                        {
+                            type: 'bool',
+                            name: 'Enable feature 42',
+                            default: false,
+                            i18n: 'settings.settings.general.enableFeature42'
+                        }
+                    ]
+                },
+                {
+                    type: 'section',
+                    name: 'aSection',
+                    i18n: 'settings.settings.aSection',
+                    content: [
+                        {
+                            type: 'bool',
+                            name: 'Enable feature 43',
+                            i18n: 'settings.settings.aSection.enableFeature43'
+                        },
+                        {
+                            type: 'selection',
+                            name: 'language',
+                            i18n: 'settings.settings.aSection.language.label',
+                            default: 'en',
+                            allowMultiple: 'false',
+                            options: [
+                                { name: 'en', i18n: 'settings.settings.aSection.language.options.en' },
+                                { name: 'de', i18n: 'settings.settings.aSection.language.options.de' },
+                            ]
+                        },
+                        {
+                            type: 'section',
+                            name: 'section2',
+                            i18n: 'settings.settings.aSection.section2.label',
+                            content: [
+                                {
+                                    type: 'string',
+                                    name: 'string',
+                                    i18n: 'settings.settings.aSection.sections.string',
+                                    default: 'str'
+                                }
+                            ]
+                        },
+                    ]
+                },
+            ]
+        }, expected: false }
+    ])('returns valid: $expected', ({ raw, expected }) => {
+        const result = validateSettingsConfig(raw);
+        if (!result.valid) {
+            console.error('Error message:', result.error);
+        };
+        expect(result.valid).toBe(expected);
+    });
+});
+
+describe('validateEntry', () => {
+    test.for([
+        [{ name: 'enableFeature42', type: 'bool', i18n: 'feature.42.enable' }],
+        [{ name: 'enableFeature42', type: 'bool', i18n: 'feature.42.enable', default: true }],
+        [{ name: 'enableFeature42', type: 'bool', i18n: 'feature.42.enable', default: false }],
+    
+        [{ name: 'aNumber', type: 'number', i18n: 'aNumber.label' }],
+        [{ name: 'aNumber', type: 'number', i18n: 'aNumber.label', default: 42 }],
+        [{ name: 'aNumber', type: 'number', i18n: 'aNumber.label', default: 0 }],
+        [{ name: 'aNumber', type: 'number', i18n: 'aNumber.label', default: -42.7 }],
+    
+        [{ name: 'aString', type: 'string', i18n: 'aString.label' }],
+        [{ name: 'aString', type: 'string', i18n: 'aString.label', default: '' }],
+        [{ name: 'aString', type: 'string', i18n: 'aString.label', default: 'Seekra is great!' }],
+
+        [{ name: 'selectSomething', type: 'selection', i18n: 'selectSomething.title', options: [
+            { name: 'yes', i18n: 'selectSomething.options.yes' },
+            { name: 'no', i18n: 'selectSomething.options.no' },
+            { name: 'maybe', i18n: 'selectSomething.options.maybe' }
+        ] }],
+
+        [{ name: 'selectSomething', type: 'selection', i18n: 'selectSomething.title', default: 'no', options: [
+            { name: 'yes', i18n: 'selectSomething.options.yes' },
+            { name: 'no', i18n: 'selectSomething.options.no' },
+            { name: 'maybe', i18n: 'selectSomething.options.maybe' }
+        ] }],
+
+        [{ name: 'aSection', type: 'section', i18n: 'sections.aSection.title', content: [] }],
+        [{ name: 'aSection', type: 'section', i18n: 'sections.aSection.title', content: [
+            { name: 'enableFeature42', type: 'bool', i18n: 'feature.42.enable', default: true }
+        ] }],
+        [{ name: 'aSection', type: 'section', i18n: 'sections.aSection.title', content: [
+            { name: 'enableFeature42', type: 'bool', i18n: 'feature.42.enable', default: true },
+            { name: 'enableFeature43', type: 'bool', i18n: 'feature.43.enable', default: true }
+        ] }],
+        [{ name: 'aSection', type: 'section', i18n: 'sections.aSection.title', content: [
+            { name: 'enableFeature42', type: 'bool', i18n: 'feature.42.enable', default: true },
+            { name: 'enableFeature43', type: 'bool', i18n: 'feature.43.enable', default: true },
+            { name: 'aSecondSection', type: 'section', i18n: 'sections.aSecondSection.title', content: [
+                { name: 'enableFeature44', type: 'bool', i18n: 'feature.44.enable', default: true },
+            ] }
+        ] }]
+    ])('throws no error for the entry %s', ([ entry ]) => {
+        expect(() => validateEntry(entry)).not.throws(Error);
+    });
+
+    test.for([
+        [{ name: 'enableFeature42', type: 'bool', i18n: '' }],
+        [{ name: 'enableFeature42', type: 'thisTypeDoesNotExistAndHasAVeryLongName', i18n: 'feature.42.enable' }],
+        [{ name: '', type: 'thisTypeDoesNotExistAndHasAVeryLongName', i18n: 'feature.42.enable' }],
+        [{ name: '', type: 'thisTypeDoesNotExistAndHasAVeryLongName', i18n: '' }],
+        [{ name: '', type: 'bool', i18n: '' }],
+        [{ name: '', type: 'bool', i18n: '' }],
+        [{ name: 'enableFeature42', type: 'bool', i18n: 'feature.42.enable', default: 42 }],
+        [{ name: 'enableFeature42', type: 'bool', i18n: 'feature.42.enable', default: '42' }],
+        [{ name: 'enableFeature42', type: 'bool', i18n: 'feature.42.enable', default: 'Seekra' }],
+        [{ name: 'enableFeature42', type: 'bool', i18n: 'feature.42.enable', default: 'true' }],
+        [{ name: 'enableFeature42', type: 'bool', i18n: 'feature.42.enable', default: 'false' }],
+        [{ name: 'enableFeature42', type: 'bool', i18n: 'feature.42.enable', default: 'undefined' }],
+        [{ name: 'enableFeature42', type: 'bool', i18n: 'feature.42.enable', default: 'null' }],
+        [{ name: 'enableFeature42', type: 'bool', i18n: 'feature.42.enable', default: [] }],
+        [{ name: 'enableFeature42', type: 'bool', i18n: 'feature.42.enable', default: {} }],
+        [{ name: 'enableFeature42', type: '', i18n: 'feature.42.enable', default: {} }],
+    
+        [{ name: '', type: 'number', i18n: 'aNumber.label' }],
+        [{ name: 'aNumber', type: 'number', i18n: 'aNumber.label', default: '42' }],
+        [{ name: 'aNumber', type: 'number', i18n: 'aNumber.label', default: 'zero' }],
+        [{ name: 'aNumber', type: 'number', i18n: 'aNumber.label', default: 'undefined' }],
+        [{ name: 'aNumber', type: 'number', i18n: 'aNumber.label', default: 'false' }],
+        [{ name: 'aNumber', type: 'number', i18n: 'aNumber.label', default: true }],
+        [{ name: 'aNumber', type: 'number', i18n: 'aNumber.label', default: false }],
+        [{ name: 'aNumber', type: 'number', i18n: 'aNumber.label', default: [] }],
+        [{ name: 'aNumber', type: 'number', i18n: 'aNumber.label', default: {} }],
+        [{ name: 'aNumber', type: '', i18n: 'aNumber.label', default: {} }],
+        [{ name: 'aNumber', type: '', i18n: 'aNumber.label', default: 42 }],
+    
+        [{ name: 'aString', type: 'string', i18n: '' }],
+        [{ name: 'aString', type: 'string', i18n: 'aString.label', default: 42 }],
+        [{ name: 'aString', type: 'string', i18n: 'aString.label', default: true }],
+        [{ name: 'aString', type: 'string', i18n: 'aString.label', default: false }],
+        [{ name: 'aString', type: 'string', i18n: 'aString.label', default: [] }],
+        [{ name: 'aString', type: 'string', i18n: 'aString.label', default: {} }],
+        [{ name: 'aString', type: 'string', i18n: '', default: {} }],
+
+        [{ name: 'selectSomething', type: 'selection', i18n: 'selectSomething.title', default: 'a', options: true }],
+        [{ name: 'selectSomething', type: 'selection', i18n: 'selectSomething.title', default: 'a', options: [] }],
+        [{ name: 'selectSomething', type: 'selection', i18n: 'selectSomething.title', default: 'c', options: [
+            { name: 'a', i18n: 'a' },
+            { name: 'b', i18n: 'b' }
+        ] }],
+        [{ name: 'selectSomething', type: 'selection', i18n: 'selectSomething.title', default: 'a', options: [
+            { name: 'a', i18n: 'a' },
+            { name: 'b', i18n: '' },
+            { name: 'c' }
+        ] }],
+        [{ name: 'selectSomething', type: 'selection', i18n: 'selectSomething.title', default: 'a', allowMultiple: 'false', options: [
+            { name: 'a', i18n: 'a' },
+            { name: 'b', i18n: '' },
+            { name: 'c' }
+        ] }],
+
+        [{ name: 'selectSomething', type: 'selection', i18n: 'selectSomething.title', default: 'no', options: [
+            { name: 'yes', i18n: '' },
+            { name: '', i18n: 'selectSomething.options.no' },
+            { name: 'maybe', i18n: 'selectSomething.options.maybe' },
+            { name: '', i18n: '' },
+            { name: 42, i18n: 43 },
+            { name: '' },
+            { i18n: '' },
+            {}
+        ] }],
+
+        [{ name: 'aSection', type: 'section', i18n: '', content: [] }],
+        [{ name: 'aSection', type: 'section', i18n: 'sections.aSection.title', content: '' }],
+        [{ name: 'aSection', type: 'section', i18n: 'sections.aSection.title', content: '[]' }],
+        [{ name: 'aSection', type: 'section', i18n: 'sections.aSection.title', content: 'a' }],
+        [{ name: 'aSection', type: 'section', i18n: 'sections.aSection.title', content: [
+            { name: 'enableFeature42', type: 'bool', i18n: 'feature.42.enable', default: true },
+            { name: 'enableFeature43', type: 'bool', i18n: 'feature.42.enable', default: 0 },
+            { name: 'enableFeature44', type: 'bool' }
+        ] }],
+        [{ name: 'aSection', type: 'section', i18n: 'sections.aSection.title', content: [
+            { name: 'enableFeature42', type: 'bool', i18n: 'feature.42.enable', default: true },
+            { name: 'enableFeature43', type: 'bool', i18n: 'feature.43.enable', default: true },
+            { name: 'aSecondSection', type: 'section', i18n: 'sections.aSecondSection.title', content: 'Hello' },
+            { name: 'aSecondSection', type: 'section', i18n: '', content: [] },
+            { name: 'aSecondSection', type: 'section', i18n: 'i18n', content: [] },
+            { name: 'aSecondSection', type: 'section', content: [] }
+        ] }]
+    ])('throws an error for the entry %s', ([ entry ]) => {
+        expect(() => validateEntry(entry)).throws(Error);
+    });
+});
+
+describe('validateSelectionOptions', () => {
+    test.for([
+        [[{ name: 'test', i18n: 'test.label' }]],
+        [[{ name: 'test', i18n: 'test.label' }, { name: 'test2', i18n: 'test2.label' }]],
+        [[{ name: 'test', i18n: 'test.label' }, { name: 'test', i18n: 'test2.label' }, { name: 'test3', i18n: 'test.label' }]]
+    ])('throws no error for the options %s', ([ options ]) => {
+        expect(() => validateSelectionOptions(options)).not.throws(Error);
+    });
+
+    test.for([
+        [[{}]],
+        [[{ i18n: '' }]],
+        [[{ i18n: 'a' }]],
+        [[{ name: 'a' }]],
+        [[{ name: '' }]],
+        [[{ name: '', i18n: 'test.label' }]],
+        [[{ name: 'test', i18n: '' }]],
+        [[{ name: '', i18n: '' }]],
+        [[{ name: '', i18n: 'test.label' }, { name: 'test2', i18n: '' }]],
+        [[{ name: 'test', i18n: '' }, { name: '', i18n: 'test2.label' }, { name: '', i18n: '  ' }, { name: '42', i18n: '42.i18n' }]],
+        [[]]
+    ])('throws an error for the options %s', ([ options ]) => {
+        expect(() => validateSelectionOptions(options)).throws(Error);
+    });
+});
+
+describe('assertType', () => {
+    test.for([
+        ['bool'],
+        ['number'],
+        ['string'],
+        ['selection'],
+        ['section']
+    ])('throws no error for the value %s', ([ value ]) => {
+        expect(() => assertType(value)).not.throw(Error);
+    });
+
+    test.for([
+        [''],
+        [' '],
+        ['  '],
+        ['   '],
+
+        ['42'],
+        ['0'],
+        ['-42'],
+        ['-42.0'],
+        ['-0.0'],
+
+        ['a'],
+        ['ab'],
+        ['SeekraIsGreat!'],
+        ['Seekra is great!'],
+
+        [undefined],
+        [null]
+    ])('throws an error for the value %s', ([ value ]) => {
+        expect(() => assertType(value)).throw(Error);
+    });
+});
+
+describe('assertString', () => {
+    test.for([
+        ['a'],
+        ['b'],
+        ['ab'],
+
+        ['0'],
+        ['42'],
+
+        ['null'],
+        ['undefined'],
+
+        ['()&%())']
+    ])('throws no error for the value %s', ([ value ]) => {
+        expect(() => assertString(value)).not.throw(Error);
+    });
+
+    test.for([
+        [0],
+        [1],
+        [42],
+        [-1],
+        [-42],
+
+        [''],
+        [' '],
+        ['  '],
+        ['     ']
+    ])('throws an error for the value %s', ([ value ]) => {
+        expect(() => assertString(value)).throws(Error);
+    });
+});
\ No newline at end of file
diff --git a/src/features/settings/utils/settingsValidator.js b/src/features/settings/utils/settingsValidator.js
index ec30713..1cf5b09 100644
--- a/src/features/settings/utils/settingsValidator.js
+++ b/src/features/settings/utils/settingsValidator.js
@@ -16,13 +16,13 @@ limitations under the License.
 
 const VALID_TYPES = ['bool', 'number', 'string', 'selection', 'section'];
 
-function assertString(value, path) {
+export const assertString = function assertString (value, path) {
     if (typeof value !== 'string' || value.trim() === '') {
         throw new Error(`[settings] "${path}" must be a non-empty string`);
     }
 }
 
-function assertType(value, path) {
+export const assertType = function assertType (value, path) {
     if (!VALID_TYPES.includes(value)) {
         throw new Error(
             `[settings] "${path}" has invalid type "${value}". Must be one of: ${VALID_TYPES.join(', ')}`
@@ -30,21 +30,23 @@ function assertType(value, path) {
     }
 }
 
-function validateSelectionOptions(options, path) {
+export const validateSelectionOptions = function validateSelectionOptions (options, path) {
     if (!Array.isArray(options) || options.length === 0) {
         throw new Error(`[settings] "${path}.options" must be a non-empty array`);
-    }
+    };
     options.forEach((opt, i) => {
         assertString(opt.name, `${path}.options[${i}].name`);
         assertString(opt.i18n, `${path}.options[${i}].i18n`);
     });
 }
 
-function validateEntry(entry, path) {
+export const validateEntry = function validateEntry (entry, path) {
     assertType(entry.type, `${path}.type`);
+    
+    assertString(entry.name, `${path}.name`);
+    assertString(entry.i18n, `${path}.i18n`);
 
     if (entry.type === 'section') {
-        assertString(entry.name, `${path}.name`);
         if (!Array.isArray(entry.content)) {
             throw new Error(`[settings] "${path}.content" must be an array`);
         }
@@ -53,26 +55,31 @@ function validateEntry(entry, path) {
         );
         return;
     }
-
-    assertString(entry.name, `${path}.name`);
-    assertString(entry.i18n, `${path}.i18n`);
-
+    
+    if (entry.type === 'selection') {
+        validateSelectionOptions(entry.options, path);
+        if (typeof entry.allowMultiple !== 'boolean' && entry.allowMultiple) {
+            throw new Error(`[settings] "${path}.allowMultiple" must be a boolean`);
+        }
+    };
     if (entry.default !== undefined) {
         if (entry.type === 'bool' && typeof entry.default !== 'boolean') {
-             throw new Error(`[settings] "${path}.default" must be a boolean`);
-         }
-         if (entry.type === 'number' && typeof entry.default !== 'number') {
-             throw new Error(`[settings] "${path}.default" must be a number`);
-         }
-         if (entry.type === 'string' && typeof entry.default !== 'string') {
-             throw new Error(`[settings] "${path}.default" must be a string`);
-         }
-         if (entry.type === 'selection') {
-             validateSelectionOptions(entry.options, path);
-             if (typeof entry.allowMultiple !== 'boolean') {
-                 throw new Error(`[settings] "${path}.allowMultiple" must be a boolean`);
-             }
-         }
+            throw new Error(`[settings] "${path}.default" must be a boolean`);
+        }
+        if (entry.type === 'number' && typeof entry.default !== 'number') {
+            throw new Error(`[settings] "${path}.default" must be a number`);
+        }
+        if (entry.type === 'string' && typeof entry.default !== 'string') {
+            throw new Error(`[settings] "${path}.default" must be a string`);
+        }
+        if (entry.type === 'selection') {
+            if (typeof entry.default !== 'string') {
+                throw new Error(`[settings] "${path}.default" must be a string`);
+            };
+            if (!entry.options.map((option) => option.name).includes(entry.default)) {
+                throw new Error(`[settings] option "${path}.default" does not exist`);
+            };
+        };
     }
 }