chore: replace karma with jest

src-ui/test-config.helper.ts

@@ -0,0 +1,21 @@
+import { TestBed } from '@angular/core/testing';
+
+type CompilerOptions = Partial<{
+  providers: any[];
+  useJit: boolean;
+  preserveWhitespaces: boolean;
+}>;
+export type ConfigureFn = (testBed: typeof TestBed) => void;
+
+export const configureTests = (configure: ConfigureFn, compilerOptions: CompilerOptions = {}) => {
+  const compilerConfig: CompilerOptions = {
+    preserveWhitespaces: false,
+    ...compilerOptions,
+  };
+
+  const configuredTestBed = TestBed.configureCompiler(compilerConfig);
+
+  configure(configuredTestBed);
+
+  return configuredTestBed.compileComponents().then(() => configuredTestBed);
+};