Module split

merge_test.go

@@ -0,0 +1,137 @@
+package path_test
+
+import (
+	"encoding/json"
+	"testing"
+
+	"github.com/gopatchy/path"
+	"github.com/stretchr/testify/require"
+)
+
+type mergeTestType struct {
+	A string
+	B int
+	C []string
+	D nestedType
+	E *nestedType
+	H int
+}
+
+type nestedType struct {
+	F []int
+	G string
+}
+
+func TestMergeString(t *testing.T) {
+	t.Parallel()
+
+	to := &mergeTestType{
+		A: "foo",
+		B: 42,
+	}
+
+	path.Merge(to, &mergeTestType{
+		A: "bar",
+	})
+
+	require.Equal(t, "bar", to.A)
+	require.Equal(t, 42, to.B)
+}
+
+func TestMergeSlice(t *testing.T) {
+	t.Parallel()
+
+	to := &mergeTestType{
+		B: 42,
+		C: []string{"foo", "bar"},
+	}
+
+	path.Merge(to, &mergeTestType{
+		C: []string{"zig", "zag"},
+	})
+
+	require.Equal(t, 42, to.B)
+	require.Equal(t, []string{"zig", "zag"}, to.C)
+}
+
+func TestMergeNested(t *testing.T) {
+	t.Parallel()
+
+	to := &mergeTestType{
+		B: 42,
+		D: nestedType{
+			F: []int{42, 43},
+			G: "bar",
+		},
+	}
+
+	path.Merge(to, &mergeTestType{
+		D: nestedType{
+			F: []int{44, 45},
+		},
+	})
+
+	require.Equal(t, 42, to.B)
+	require.Equal(t, []int{44, 45}, to.D.F)
+	require.Equal(t, "bar", to.D.G)
+}
+
+func TestMergeNestedPointer(t *testing.T) {
+	t.Parallel()
+
+	to := &mergeTestType{
+		B: 42,
+		E: &nestedType{
+			F: []int{42, 43},
+			G: "bar",
+		},
+	}
+
+	path.Merge(to, &mergeTestType{
+		E: &nestedType{
+			F: []int{49, 50},
+		},
+	})
+
+	require.Equal(t, 42, to.B)
+	require.Equal(t, []int{49, 50}, to.E.F)
+	require.Equal(t, "bar", to.E.G)
+}
+
+func TestMergeMap(t *testing.T) {
+	t.Parallel()
+
+	to := &mergeTestType{
+		A: "foo",
+		B: 42,
+		D: nestedType{
+			F: []int{42, 43},
+			G: "bar",
+		},
+		H: 5,
+	}
+
+	from := map[string]any{}
+
+	err := json.Unmarshal(
+		[]byte(`
+{
+	"B": 45,
+	"D": {
+		"F": [46, 47]
+	},
+	"H": 0
+}`),
+		&from,
+	)
+	require.NoError(t, err)
+
+	err = path.MergeMap(to, from)
+	require.NoError(t, err)
+
+	require.Equal(t, "foo", to.A)
+	require.Equal(t, 45, to.B)
+	require.Equal(t, []int{46, 47}, to.D.F)
+	require.Equal(t, "bar", to.D.G)
+	require.Equal(t, 0, to.H)
+}