added tests and fixed usage

1 files changed, 29 insertions, 3 deletions

diff --git a/example_test.go b/example_test.go
index acfacad..6216e18 100644
--- a/example_test.go
+++ b/example_test.go
@@ -499,12 +499,12 @@ func Example_allSupportedTypes() {
 
 func Example_envVarOnly() {
 	os.Args = split("./example")
-	_ = os.Setenv("NUM_WORKERS", "my_key")
+	_ = os.Setenv("AUTH_KEY", "my_key")
 
-	defer os.Unsetenv("NUM_WORKERS")
+	defer os.Unsetenv("AUTH_KEY")
 
 	var args struct {
-		AuthKey string `arg:"-,--,env:NUM_WORKERS"`
+		AuthKey string `arg:"-,--,env:AUTH_KEY"`
 	}
 
 	MustParse(&args)
@@ -512,3 +512,29 @@ func Example_envVarOnly() {
 	fmt.Println(args.AuthKey)
 	// output: my_key
 }
+
+func Example_envVarOnlyShouldIgnoreFlag() {
+	os.Args = split("./example --=my_key")
+
+	var args struct {
+		AuthKey string `arg:"-,--,env:AUTH_KEY"`
+	}
+
+	err := Parse(&args)
+
+	fmt.Println(err)
+	// output: unknown argument --=my_key
+}
+
+func Example_envVarOnlyShouldIgnoreShortFlag() {
+	os.Args = split("./example -=my_key")
+
+	var args struct {
+		AuthKey string `arg:"-,--,env:AUTH_KEY"`
+	}
+
+	err := Parse(&args)
+
+	fmt.Println(err)
+	// output: unknown argument -=my_key
+}