chore(internal): added engine version related tests.

Signed-off-by: Federico Di Pierro <[email protected]>

Co-authored-by: Lorenzo Susini <[email protected]>

internal/follower/follower_test.go

@@ -0,0 +1,91 @@
+// SPDX-License-Identifier: Apache-2.0
+// Copyright 2024 The Falco Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package follower
+
+import (
+	"os"
+	"testing"
+
+	"github.com/pterm/pterm"
+	"github.com/stretchr/testify/assert"
+
+	"github.com/falcosecurity/falcoctl/pkg/oci"
+	"github.com/falcosecurity/falcoctl/pkg/output"
+)
+
+func TestCheckRequirements(t *testing.T) {
+	printer := output.NewPrinter(pterm.LogLevelDebug, pterm.LogFormatterJSON, os.Stdout)
+	config := Config{
+		FalcoVersions: map[string]string{"engine_version_semver": "0.26.0", "engine_version": "26"},
+	}
+	f, err := New("ghcr.io/falcosecurity/rules/my_rule:0.1.0", printer, &config)
+	assert.NoError(t, err)
+
+	type testArtifact struct {
+		conf      *oci.ArtifactConfig
+		expectErr bool
+		testName  string
+	}
+	var testArtifactConfigs = []testArtifact{
+		{
+			conf: &oci.ArtifactConfig{
+				Name:         "my_rule",
+				Version:      "0.1.0",
+				Requirements: []oci.ArtifactRequirement{{Name: "engine_version_semver", Version: "0.26.0"}},
+			},
+			expectErr: false,
+			testName:  "New rules with new semver engine version",
+		},
+		{
+			conf: &oci.ArtifactConfig{
+				Name:         "my_rule",
+				Version:      "0.1.0",
+				Requirements: []oci.ArtifactRequirement{{Name: "engine_version_semver", Version: "26"}},
+			},
+			expectErr: true,
+			testName:  "New rules with old int engine version",
+		},
+		{
+			conf: &oci.ArtifactConfig{
+				Name:         "my_rule",
+				Version:      "0.1.0",
+				Requirements: []oci.ArtifactRequirement{{Name: "engine_version", Version: "26"}},
+			},
+			expectErr: false,
+			testName:  "Old rules with old int engine version",
+		},
+		{
+			conf: &oci.ArtifactConfig{
+				Name:         "my_rule",
+				Version:      "0.1.0",
+				Requirements: []oci.ArtifactRequirement{{Name: "engine_version", Version: "0.26.0"}},
+			},
+			expectErr: true,
+			testName:  "Old rules with new semver engine version",
+		},
+	}
+
+	for _, artConf := range testArtifactConfigs {
+		t.Run(artConf.testName, func(t *testing.T) {
+			err = f.checkRequirements(artConf.conf)
+			if artConf.expectErr {
+				assert.Error(t, err)
+			} else {
+				assert.NoError(t, err)
+			}
+		})
+	}
+}