Merge pull request #32 from alexflint/override_program_name

make it possible to override the name of the program

1 files changed, 20 insertions, 2 deletions

diff --git a/usage_test.go b/usage_test.go
index 255018d..fd2ba3a 100644
--- a/usage_test.go
+++ b/usage_test.go
@@ -43,7 +43,7 @@ options:
 	}
 	args.Name = "Foo Bar"
 	args.Value = 42
-	p, err := NewParser(&args)
+	p, err := NewParser(Config{}, &args)
 	require.NoError(t, err)
 
 	os.Args[0] = "example"
@@ -71,7 +71,25 @@ options:
 		VeryLongPositionalWithHelp string `arg:"positional,help:this positional argument is very long"`
 	}
 
-	p, err := NewParser(&args)
+	p, err := NewParser(Config{}, &args)
+	require.NoError(t, err)
+
+	os.Args[0] = "example"
+	var help bytes.Buffer
+	p.WriteHelp(&help)
+	assert.Equal(t, expectedHelp, help.String())
+}
+
+func TestUsageWithProgramName(t *testing.T) {
+	expectedHelp := `usage: myprogram
+
+options:
+  --help, -h             display this help and exit
+`
+	config := Config{
+		Program: "myprogram",
+	}
+	p, err := NewParser(config, &struct{}{})
 	require.NoError(t, err)
 
 	os.Args[0] = "example"