chart-testing 3.0.0 (new formula)

Closes #58615.

Signed-off-by: Dawid Dziurla <dawidd0811@gmail.com>

Formula/chart-testing.rb

@@ -0,0 +1,33 @@
+class ChartTesting < Formula
+  desc "Testing and linting Helm charts"
+  homepage "https://github.com/helm/chart-testing"
+  url "https://github.com/helm/chart-testing.git",
+      tag:      "v3.0.0",
+      revision: "50db473a1e68c605b18d82f019d83ea401542213"
+  license "Apache-2.0"
+
+  depends_on "go" => :build
+  depends_on "helm" => :test
+  depends_on "yamllint" => :test
+
+  def install
+    commit = Utils.safe_popen_read("git", "rev-parse", "HEAD").chomp
+    ldflags = %W[
+      -X github.com/helm/chart-testing/v3/ct/cmd.Version=#{version}
+      -X github.com/helm/chart-testing/v3/ct/cmd.GitCommit=#{commit}
+      -X github.com/helm/chart-testing/v3/ct/cmd.BuildDate=#{Date.today}
+    ].join(" ")
+    system "go", "build", *std_go_args, "-ldflags", ldflags, "-o", bin/"ct", "./ct/main.go"
+    etc.install "etc" => "ct"
+  end
+
+  test do
+    assert_match "Lint and test", shell_output("#{bin}/ct --help")
+
+    # Lint an empty Helm chart that we create with `helm create`
+    system "helm", "create", "testchart"
+    output = shell_output("#{bin}/ct lint --charts ./testchart --validate-chart-schema=false" \
+                          " --validate-maintainers=false").lines.last.chomp
+    assert_match "All charts linted successfully", output
+  end
+end