feat: to have display value

src/matchers/to-have-display-value.tsx

@@ -0,0 +1,43 @@
+import type { ReactTestInstance } from 'react-test-renderer';
+import { matcherHint } from 'jest-matcher-utils';
+import { isHostTextInput } from '../helpers/host-component-names';
+import { ErrorWithStack } from '../helpers/errors';
+import { TextMatch, TextMatchOptions, matches } from '../matches';
+import { checkHostElement, formatMessage } from './utils';
+
+export function toHaveDisplayValue(
+  this: jest.MatcherContext,
+  element: ReactTestInstance,
+  expectedValue: TextMatch,
+  options?: TextMatchOptions
+) {
+  checkHostElement(element, toHaveDisplayValue, this);
+
+  if (!isHostTextInput(element)) {
+    throw new ErrorWithStack(
+      `toHaveDisplayValue() works only with host "TextInput" elements. Passed element has type "${element.type}".`,
+      toHaveDisplayValue
+    );
+  }
+
+  const value = element.props.value ?? element.props.defaultValue;
+
+  return {
+    pass: matches(expectedValue, value, options?.normalizer, options?.exact),
+    message: () => {
+      return [
+        formatMessage(
+          matcherHint(
+            `${this.isNot ? '.not' : ''}.toHaveDisplayValue`,
+            'element',
+            ''
+          ),
+          `Expected element ${this.isNot ? 'not to' : 'to'} have display value`,
+          expectedValue,
+          'Received',
+          value
+        ),
+      ].join('\n');
+    },
+  };
+}