feat(hierarchy): XML parser and selector resolver for uiautomator dumps

internal/hierarchy/hierarchy_test.go

@@ -0,0 +1,75 @@
+package hierarchy
+
+import "testing"
+
+const sampleDump = `<?xml version='1.0' encoding='UTF-8' standalone='yes' ?>
+<hierarchy rotation="0">
+  <node class="android.widget.LinearLayout" package="app" bounds="[0,0][1080,2340]">
+    <node resource-id="app:id/title" text="Hello" bounds="[10,20][200,60]" clickable="false" enabled="true"/>
+    <node resource-id="app:id/row" text="Alice" content-desc="row" bounds="[0,100][1080,200]" clickable="true" enabled="true"/>
+    <node resource-id="app:id/row" text="Bob" content-desc="row" bounds="[0,200][1080,300]" clickable="true" enabled="true"/>
+  </node>
+</hierarchy>`
+
+func TestParseCountsNodes(t *testing.T) {
+	tree, err := Parse(sampleDump)
+	if err != nil {
+		t.Fatalf("Parse: %v", err)
+	}
+	if len(tree.Elements) != 4 {
+		t.Fatalf("want 4 elements, got %d", len(tree.Elements))
+	}
+}
+
+func TestFindByIDSuffix(t *testing.T) {
+	tree, _ := Parse(sampleDump)
+	element := tree.Find("id:title")
+	if element == nil {
+		t.Fatal("expected match for id:title")
+	}
+	if element.Text != "Hello" {
+		t.Fatalf("unexpected text %q", element.Text)
+	}
+}
+
+func TestFindByText(t *testing.T) {
+	tree, _ := Parse(sampleDump)
+	element := tree.Find("text:Alice")
+	if element == nil {
+		t.Fatal("expected match for text:Alice")
+	}
+}
+
+func TestFindAllReturnsDuplicates(t *testing.T) {
+	tree, _ := Parse(sampleDump)
+	elements := tree.FindAll("id:row")
+	if len(elements) != 2 {
+		t.Fatalf("want 2, got %d", len(elements))
+	}
+}
+
+func TestBoundsCenter(t *testing.T) {
+	tree, _ := Parse(sampleDump)
+	element := tree.Find("text:Alice")
+	x, y := element.Bounds.Center()
+	if x != 540 || y != 150 {
+		t.Fatalf("unexpected center %d,%d", x, y)
+	}
+}
+
+func TestParseEmpty(t *testing.T) {
+	tree, err := Parse("")
+	if err != nil {
+		t.Fatalf("Parse: %v", err)
+	}
+	if len(tree.Elements) != 0 {
+		t.Fatalf("want empty, got %d", len(tree.Elements))
+	}
+}
+
+func TestUnknownSelector(t *testing.T) {
+	tree, _ := Parse(sampleDump)
+	if tree.Find("bogus:value") != nil {
+		t.Fatal("unknown kind should not match")
+	}
+}