feat: Bundle assets in binary using go:embed (#340)

Fixes #47

web/static_test.go

@@ -0,0 +1,74 @@
+package static
+
+import (
+	"io/fs"
+	"strings"
+	"testing"
+)
+
+func TestEmbed(t *testing.T) {
+	scenarios := []struct {
+		path                  string
+		shouldExist           bool
+		expectedContainString string
+	}{
+		{
+			path:                  "index.html",
+			shouldExist:           true,
+			expectedContainString: "</body>",
+		},
+		{
+			path:                  "favicon.ico",
+			shouldExist:           true,
+			expectedContainString: "", // not checking because it's an image
+		},
+		{
+			path:                  "img/logo.svg",
+			shouldExist:           true,
+			expectedContainString: "</svg>",
+		},
+		{
+			path:                  "css/app.css",
+			shouldExist:           true,
+			expectedContainString: "background-color",
+		},
+		{
+			path:                  "js/app.js",
+			shouldExist:           true,
+			expectedContainString: "function",
+		},
+		{
+			path:                  "js/chunk-vendors.js",
+			shouldExist:           true,
+			expectedContainString: "function",
+		},
+		{
+			path:        "file-that-does-not-exist.html",
+			shouldExist: false,
+		},
+	}
+	staticFileSystem, err := fs.Sub(FileSystem, RootPath)
+	if err != nil {
+		t.Fatal(err)
+	}
+	for _, scenario := range scenarios {
+		t.Run(scenario.path, func(t *testing.T) {
+			content, err := fs.ReadFile(staticFileSystem, scenario.path)
+			if !scenario.shouldExist {
+				if err == nil {
+					t.Errorf("%s should not have existed", scenario.path)
+				}
+			} else {
+				if err != nil {
+					t.Errorf("opening %s should not have returned an error, got %s", scenario.path, err.Error())
+				}
+				if len(content) == 0 {
+					t.Errorf("%s should have existed in the static FileSystem, but was empty", scenario.path)
+				}
+				if !strings.Contains(string(content), scenario.expectedContainString) {
+					t.Errorf("%s should have contained %s, but did not", scenario.path, scenario.expectedContainString)
+				}
+			}
+		})
+	}
+}