test(unikraft/app): Add unit tests for normalize.go (#2695)

Reviewed-by: Cezar Craciunoiu <cezar.craciunoiu@unikraft.com>
Approved-by: Cezar Craciunoiu <cezar.craciunoiu@unikraft.com>

Author: craciunoiuc

unikraft/app/normalize_test.go

@@ -0,0 +1,117 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// Copyright (c) 2022, Unikraft GmbH and The KraftKit Authors.
+// Licensed under the BSD-3-Clause License (the "License").
+// You may not use this file except in compliance with the License.
+package app
+
+import (
+	"testing"
+)
+
+func Test_normalizeProjectName(t *testing.T) {
+	tests := []struct {
+		name  string
+		input string
+		want  string
+	}{
+		{
+			name:  "lowercase passthrough",
+			input: "myapp",
+			want:  "myapp",
+		},
+		{
+			name:  "uppercase converted to lowercase",
+			input: "MyApp",
+			want:  "myapp",
+		},
+		{
+			name:  "all uppercase",
+			input: "MYAPP",
+			want:  "myapp",
+		},
+		{
+			name:  "with hyphen",
+			input: "my-app",
+			want:  "my-app",
+		},
+		{
+			name:  "with underscore",
+			input: "my_app",
+			want:  "my_app",
+		},
+		{
+			name:  "spaces removed",
+			input: "my app",
+			want:  "myapp",
+		},
+		{
+			name:  "special characters removed",
+			input: "my.app!",
+			want:  "myapp",
+		},
+		{
+			name:  "leading underscore trimmed",
+			input: "_myapp",
+			want:  "myapp",
+		},
+		{
+			name:  "leading hyphen trimmed",
+			input: "-myapp",
+			want:  "myapp",
+		},
+		{
+			name:  "multiple leading underscores and hyphens trimmed",
+			input: "--__myapp",
+			want:  "myapp",
+		},
+		{
+			name:  "digits preserved",
+			input: "app123",
+			want:  "app123",
+		},
+		{
+			name:  "mixed case with digits and special chars",
+			input: "My App 123!",
+			want:  "myapp123",
+		},
+		{
+			name:  "empty string",
+			input: "",
+			want:  "",
+		},
+		{
+			name:  "only special characters",
+			input: "!!!",
+			want:  "",
+		},
+		{
+			name:  "only leading separators",
+			input: "---",
+			want:  "",
+		},
+		{
+			name:  "uppercase with digits",
+			input: "MyApp123",
+			want:  "myapp123",
+		},
+		{
+			name:  "trailing hyphen preserved",
+			input: "myapp-",
+			want:  "myapp-",
+		},
+		{
+			name:  "trailing underscore preserved",
+			input: "myapp_",
+			want:  "myapp_",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := normalizeProjectName(tt.input)
+			if got != tt.want {
+				t.Errorf("normalizeProjectName(%q) = %q, want %q", tt.input, got, tt.want)
+			}
+		})
+	}
+}