test(installer): cover install/uninstall script contents

Adds two test cases to common_ubuntu_test.go asserting the rendered
Install()/Uninstall() scripts reference the new bundle layout (raw
kubeadm/kubelet/kubectl binaries, crictl.tar.gz, cni-plugins.tgz, runc,
containerd.tar.gz) and contain no leftover dpkg/.deb references -- guarding
against the exact regression this branch fixes (templates drifting from what
the bundle builder actually packages) without needing a real bundle or host.

Author: srm6867

installer/internal/algo/common_ubuntu_test.go

@@ -43,3 +43,58 @@ func TestBaseUbuntuInstallerUninstallKernelModuleCleanup(t *testing.T) {
 		})
 	}
 }
+
+// TestBaseUbuntuInstallerInstallsBundleContent guards against install.sh.tmpl drifting from what
+// the bundle builder (installer/bundle_builder/build-bundle.sh) actually packages: kubeadm,
+// kubelet and kubectl as raw binaries, crictl and CNI plugins as tarballs, runc as a raw binary,
+// and containerd as a plain (non-deprecated) release tarball -- not apt .deb packages.
+func TestBaseUbuntuInstallerInstallsBundleContent(t *testing.T) {
+	installer, err := algo.NewBaseUbuntuInstaller(context.Background(), "amd64", "test-bundle", "", false)
+	require.NoError(t, err)
+
+	installScript := installer.Install()
+
+	wantSubstrings := []string{
+		`install -m 0755 "$BUNDLE_PATH/kubeadm" /usr/bin/kubeadm`,
+		`install -m 0755 "$BUNDLE_PATH/kubelet" /usr/bin/kubelet`,
+		`install -m 0755 "$BUNDLE_PATH/kubectl" /usr/bin/kubectl`,
+		`tar -C /usr/local/bin -xvf "$BUNDLE_PATH/crictl.tar.gz"`,
+		`tar -C /opt/cni/bin -xvf "$BUNDLE_PATH/cni-plugins.tgz"`,
+		`install -m 0755 "$BUNDLE_PATH/runc" /usr/local/sbin/runc`,
+		`tar -C /usr/local -xvf "$BUNDLE_PATH/containerd.tar.gz"`,
+	}
+	for _, want := range wantSubstrings {
+		assert.Contains(t, installScript, want)
+	}
+
+	unwantedSubstrings := []string{"dpkg --install", ".deb"}
+	for _, unwanted := range unwantedSubstrings {
+		assert.NotContains(t, installScript, unwanted)
+	}
+}
+
+// TestBaseUbuntuInstallerUninstallsBundleContent is the removal-side counterpart of
+// TestBaseUbuntuInstallerInstallsBundleContent -- every path install.sh.tmpl creates must have a
+// matching removal in uninstall.sh.tmpl.
+func TestBaseUbuntuInstallerUninstallsBundleContent(t *testing.T) {
+	installer, err := algo.NewBaseUbuntuInstaller(context.Background(), "amd64", "test-bundle", "", false)
+	require.NoError(t, err)
+
+	uninstallScript := installer.Uninstall()
+
+	wantSubstrings := []string{
+		"rm -f /usr/bin/kubeadm /usr/bin/kubelet /usr/bin/kubectl",
+		"rm -f /usr/local/sbin/runc",
+		`tar tzf "$BUNDLE_PATH/crictl.tar.gz"`,
+		`tar tzf "$BUNDLE_PATH/containerd.tar.gz"`,
+		"rm -rf /opt/cni/",
+	}
+	for _, want := range wantSubstrings {
+		assert.Contains(t, uninstallScript, want)
+	}
+
+	unwantedSubstrings := []string{"dpkg --purge", "dpkg -l"}
+	for _, unwanted := range unwantedSubstrings {
+		assert.NotContains(t, uninstallScript, unwanted)
+	}
+}