Adding test for the linter (#580)

cmd/lint/main_test.go

@@ -0,0 +1,35 @@
+package main
+
+import (
+	"github.com/stretchr/testify/assert"
+	"os"
+	"os/exec"
+	"strings"
+	"testing"
+)
+
+func Test_Invalid_input_file(t *testing.T) {
+	inputFile := "testdata/invalid-rule.yaml"
+	inputFormat := "yaml"
+	testName := "Test_Invalid_input_file"
+
+	if os.Getenv("SHOULD_CRASH") == "true" {
+		runAppMain(inputFile, inputFormat)
+		return
+	}
+	// nolint: gosec
+	cmd := exec.Command(os.Args[0], "-test.run="+testName)
+	cmd.Env = append(os.Environ(), "SHOULD_CRASH=true")
+	err := cmd.Run()
+
+	e, ok := err.(*exec.ExitError)
+	assert.True(t, ok && !e.Success())
+}
+
+func runAppMain(fileName string, format string) {
+	args := strings.Split(os.Getenv("SHOULD_CRASH"), " ")
+	os.Args = append([]string{os.Args[0]}, args...)
+	os.Args = append(os.Args, "--input-file="+fileName)
+	os.Args = append(os.Args, "--input-format="+format)
+	main()
+}

cmd/lint/testdata/valid.yaml

@@ -0,0 +1,10 @@
+test-flag:
+  variations:
+    true_var: true
+    false_var: false
+  targeting:
+    - query: key eq "random-key"
+      variation: false_var
+  defaultRule:
+    variation: false_var
+  trackEvents: false