FIX: category-drop initial state was incorrect (#6743)

test/javascripts/components/category-drop-test.js.es6

@@ -0,0 +1,92 @@
+import componentTest from "helpers/component-test";
+import Category from "discourse/models/category";
+
+moduleForComponent("category-drop", {
+  integration: true,
+  beforeEach: function() {
+    this.set("subject", selectKit());
+  }
+});
+
+componentTest("subcatgories - no selection", {
+  template:
+    "{{category-drop onSelect=onSelect category=category parentCategory=parentCategory categories=childCategories subCategory=true noSubcategories=false}}",
+
+  beforeEach() {
+    const parentCategory = Category.findById(2);
+
+    const childCategories = this.site.get("categoriesList").filter(c => {
+      return c.get("parentCategory") === parentCategory;
+    });
+
+    this.set("childCategories", childCategories);
+    this.set("parentCategory", parentCategory);
+  },
+
+  async test(assert) {
+    assert.equal(
+      this.get("subject")
+        .header()
+        .title(),
+      I18n.t("categories.all_subcategories")
+    );
+
+    await this.get("subject").expand();
+
+    assert.equal(
+      this.get("subject")
+        .rowByIndex(0)
+        .name(),
+      I18n.t("categories.no_subcategory")
+    );
+
+    assert.equal(
+      this.get("subject")
+        .rowByIndex(1)
+        .name(),
+      this.get("childCategories.firstObject.name")
+    );
+  }
+});
+
+componentTest("subcatgories - selection", {
+  template:
+    "{{category-drop onSelect=onSelect category=category parentCategory=parentCategory categories=childCategories subCategory=true noSubcategories=false}}",
+
+  beforeEach() {
+    const parentCategory = Category.findById(2);
+
+    const childCategories = this.site.get("categoriesList").filter(c => {
+      return c.get("parentCategory") === parentCategory;
+    });
+
+    this.set("childCategories", childCategories);
+    this.set("category", childCategories.get("firstObject"));
+    this.set("parentCategory", parentCategory);
+  },
+
+  async test(assert) {
+    assert.equal(
+      this.get("subject")
+        .header()
+        .title(),
+      this.get("childCategories.firstObject.name")
+    );
+
+    await this.get("subject").expand();
+
+    assert.equal(
+      this.get("subject")
+        .rowByIndex(0)
+        .name(),
+      I18n.t("categories.all_subcategories")
+    );
+
+    assert.equal(
+      this.get("subject")
+        .rowByIndex(1)
+        .name(),
+      I18n.t("categories.no_subcategory")
+    );
+  }
+});