Add tests for isHermesV1Enabled (#53601)

Summary:
Pull Request resolved: #53601

Changelog: [Internal]

Adds tests covering the `isHermesV1Enabled` utility function.

Reviewed By: cortinico

Differential Revision: D81681635

fbshipit-source-id: c2c50db65f93b8b58ce1730ccfdf4367a024ce7b

Author: j-piasecki

packages/gradle-plugin/react-native-gradle-plugin/src/test/kotlin/com/facebook/react/utils/ProjectUtilsTest.kt

@@ -14,6 +14,7 @@ import com.facebook.react.tests.createProject
 import com.facebook.react.utils.ProjectUtils.getReactNativeArchitectures
 import com.facebook.react.utils.ProjectUtils.isEdgeToEdgeEnabled
 import com.facebook.react.utils.ProjectUtils.isHermesEnabled
+import com.facebook.react.utils.ProjectUtils.isHermesV1Enabled
 import com.facebook.react.utils.ProjectUtils.isNewArchEnabled
 import com.facebook.react.utils.ProjectUtils.needsCodegenFromPackageJson
 import java.io.File
@@ -115,6 +116,32 @@ class ProjectUtilsTest {
     assertThat(project.isEdgeToEdgeEnabled).isFalse()
   }
 
+  @Test
+  fun isHermesV1Enabled_returnsFalseByDefault() {
+    assertThat(createProject().isHermesV1Enabled).isFalse()
+  }
+
+  @Test
+  fun isHermesV1Enabled_withDisabledViaProperty_returnsFalse() {
+    val project = createProject()
+    project.extensions.extraProperties.set("hermesV1Enabled", "false")
+    assertThat(project.isHermesV1Enabled).isFalse()
+  }
+
+  @Test
+  fun isHermesV1Enabled_withEnabledViaProperty_returnsTrue() {
+    val project = createProject()
+    project.extensions.extraProperties.set("hermesV1Enabled", "true")
+    assertThat(project.isHermesV1Enabled).isTrue()
+  }
+
+  @Test
+  fun isHermesV1Enabled_withInvalidViaProperty_returnsFalse() {
+    val project = createProject()
+    project.extensions.extraProperties.set("hermesV1Enabled", "¯\\_(ツ)_/¯")
+    assertThat(project.isHermesV1Enabled).isFalse()
+  }
+
   @Test
   fun needsCodegenFromPackageJson_withCodegenConfigInPackageJson_returnsTrue() {
     val project = createProject()