1 files changed, 79 insertions, 0 deletions

diff --git a/cli/internal/util/parse_concurrency_test.go b/cli/internal/util/parse_concurrency_test.go
new file mode 100644
index 0000000..b732724
--- /dev/null
+++ b/cli/internal/util/parse_concurrency_test.go
@@ -0,0 +1,79 @@
+package util
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestParseConcurrency(t *testing.T) {
+	cases := []struct {
+		Input    string
+		Expected int
+	}{
+		{
+			"12",
+			12,
+		},
+		{
+			"200%",
+			20,
+		},
+		{
+			"100%",
+			10,
+		},
+		{
+			"50%",
+			5,
+		},
+		{
+			"25%",
+			2,
+		},
+		{
+			"1%",
+			1,
+		},
+		{
+			"0644", // we parse in base 10
+			644,
+		},
+	}
+
+	// mock runtime.NumCPU() to 10
+	runtimeNumCPU = func() int {
+		return 10
+	}
+
+	for i, tc := range cases {
+		t.Run(fmt.Sprintf("%d) '%s' should be parsed at '%d'", i, tc.Input, tc.Expected), func(t *testing.T) {
+			if result, err := ParseConcurrency(tc.Input); err != nil {
+				t.Fatalf("invalid parse: %#v", err)
+			} else {
+				assert.EqualValues(t, tc.Expected, result)
+			}
+		})
+	}
+}
+
+func TestInvalidPercents(t *testing.T) {
+	inputs := []string{
+		"asdf",
+		"-1",
+		"-l%",
+		"infinity%",
+		"-infinity%",
+		"nan%",
+		"0b01",
+		"0o644",
+		"0xFF",
+	}
+	for _, tc := range inputs {
+		t.Run(tc, func(t *testing.T) {
+			val, err := ParseConcurrency(tc)
+			assert.Error(t, err, "input %v got %v", tc, val)
+		})
+	}
+}