test(11.1-07): planted fixtures and unit tests for fence, execution and name-form holes

- eighteen violation plants pin nested src=, Go aliases, unrun examples, build membership and command forms
- unit tests cover fence collection, captions, goLang, go doc -c, commandWord and Sync

internal/docsite/highlight_test.go

@@ -150,3 +150,16 @@ func TestHighlightFenceMarkup(t *testing.T) {
 		t.Error("a fence without src= has a caption")
 	}
 }
+
+func TestGoLang(t *testing.T) {
+	for _, lang := range []string{"go", "Go", "GO", "golang", "Golang", "main.go"} {
+		if !goLang(lang) {
+			t.Errorf("goLang(%q) = false, want true", lang)
+		}
+	}
+	for _, lang := range []string{"go-html-template", "go-text-template", "text", "yaml", "sh", ""} {
+		if goLang(lang) {
+			t.Errorf("goLang(%q) = true, want false", lang)
+		}
+	}
+}