Added test coverage for searching for deeply nested values

viper_test.go

diff --git a/viper_test.go b/viper_test.go
index 334773d..76ec0d2 100644
--- a/viper_test.go
+++ b/viper_test.go
@@ -453,3 +453,87 @@
 		assert.Equal(t, expected, parseSizeInBytes(str), str)
 	}
 }
+
+func TestFindsNestedKeys(t *testing.T) {
+	initConfigs()
+	dob, _ := time.Parse(time.RFC3339, "1979-05-27T07:32:00Z")
+
+	Set("super", map[string]interface{}{
+		"deep": map[string]interface{}{
+			"nested": "value",
+		},
+	})
+
+	expected := map[string]interface{}{
+		"super": map[string]interface{}{
+			"deep": map[string]interface{}{
+				"nested": "value",
+			},
+		},
+		"super.deep": map[string]interface{}{
+			"nested": "value",
+		},
+		"super.deep.nested":  "value",
+		"owner.organization": "MongoDB",
+		"batters.batter": []interface{}{
+			map[string]interface{}{
+				"type": "Regular",
+			},
+			map[string]interface{}{
+				"type": "Chocolate",
+			},
+			map[string]interface{}{
+				"type": "Blueberry",
+			},
+			map[string]interface{}{
+				"type": "Devil's Food",
+			},
+		},
+		"hobbies": []interface{}{
+			"skateboarding", "snowboarding", "go",
+		},
+		"title":  "TOML Example",
+		"newkey": "remote",
+		"batters": map[string]interface{}{
+			"batter": []interface{}{
+				map[string]interface{}{
+					"type": "Regular",
+				},
+				map[string]interface{}{
+					"type": "Chocolate",
+				}, map[string]interface{}{
+					"type": "Blueberry",
+				}, map[string]interface{}{
+					"type": "Devil's Food",
+				},
+			},
+		},
+		"eyes": "brown",
+		"age":  35,
+		"owner": map[string]interface{}{
+			"organization": "MongoDB",
+			"Bio":          "MongoDB Chief Developer Advocate & Hacker at Large",
+			"dob":          dob,
+		},
+		"owner.Bio": "MongoDB Chief Developer Advocate & Hacker at Large",
+		"type":      "donut",
+		"id":        "0001",
+		"name":      "Cake",
+		"hacker":    true,
+		"ppu":       0.55,
+		"clothing": map[interface{}]interface{}{
+			"jacket":   "leather",
+			"trousers": "denim",
+		},
+		"clothing.jacket":   "leather",
+		"clothing.trousers": "denim",
+		"owner.dob":         dob,
+		"beard":             true,
+	}
+
+	for key, expectedValue := range expected {
+
+		assert.Equal(t, expectedValue, v.Get(key))
+	}
+
+}