Testing issue #139 as expected by Sprig's merge template function as …

…used in Helm

issue139_test.go

@@ -0,0 +1,66 @@
+package mergo
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestIssue139(t *testing.T) {
+	srcs := []map[string]interface{}{
+		{
+			"h": 10,
+			"i": "i",
+			"j": "j",
+		},
+		{
+			"a": 1,
+			"b": 2,
+			"d": map[string]interface{}{
+				"e": "four",
+			},
+			"g": []int{6, 7},
+			"i": "aye",
+			"j": "jay",
+			"k": map[string]interface{}{
+				"l": false,
+			},
+		},
+	}
+	dst := map[string]interface{}{
+		"a": "one",
+		"c": 3,
+		"d": map[string]interface{}{
+			"f": 5,
+		},
+		"g": []int{8, 9},
+		"i": "eye",
+		"k": map[string]interface{}{
+			"l": true,
+		},
+	}
+
+	for _, src := range srcs {
+		if err := Merge(&dst, src); err != nil {
+			t.Fatal(err)
+		}
+	}
+
+	expected := map[string]interface{}{
+		"a": "one", // key overridden
+		"b": 2,     // merged from src1
+		"c": 3,     // merged from dst
+		"d": map[string]interface{}{ // deep merge
+			"e": "four",
+			"f": 5,
+		},
+		"g": []int{8, 9}, // overridden - arrays are not merged
+		"h": 10,          // merged from src2
+		"i": "eye",       // overridden twice
+		"j": "jay",       // overridden and merged
+		"k": map[string]interface{}{
+			"l": true, // overridden
+		},
+	}
+	assert.Equal(t, expected, dst)
+}