platform

inventory/inventory_test.go

@@ -0,0 +1,47 @@
+package inventory
+
+import "testing"
+
+func TestLevelFor(t *testing.T) {
+	const low = int64(5)
+	cases := []struct {
+		qty  int64
+		want Level
+	}{
+		{-3, LevelNone},
+		{0, LevelNone},
+		{1, LevelLow},
+		{5, LevelLow}, // at the watermark is still low
+		{6, LevelHigh},
+		{1000, LevelHigh},
+	}
+	for _, c := range cases {
+		if got := LevelFor(c.qty, low); got != c.want {
+			t.Errorf("LevelFor(%d, %d) = %q, want %q", c.qty, low, got, c.want)
+		}
+	}
+}
+
+func TestLevelInStock(t *testing.T) {
+	if LevelNone.InStock() {
+		t.Error("none should not be in stock")
+	}
+	if !LevelLow.InStock() || !LevelHigh.InStock() {
+		t.Error("low and high should be in stock")
+	}
+}
+
+func TestLevelChangedRoundTrip(t *testing.T) {
+	in := LevelChanged{SKU: "ABC-1", Location: "se", Level: LevelLow}
+	raw, err := in.Encode()
+	if err != nil {
+		t.Fatalf("encode: %v", err)
+	}
+	out, err := Decode(raw)
+	if err != nil {
+		t.Fatalf("decode: %v", err)
+	}
+	if out != in {
+		t.Errorf("round-trip mismatch: got %+v, want %+v", out, in)
+	}
+}