test: add more test cases for map, slice, struct

Those are types for which the Sprintf("%+v") catchall code is used.

test/output.go

@@ -404,6 +404,24 @@ I output.go:<LINE>] "test" firstKey=1 secondKey=3
 		text:       "map keys",
 		values:     []interface{}{map[string]bool{"test": true}, "test"},
 		expectedOutput: `I output.go:<LINE>] "map keys" map[test:%!s(bool=true)]="test"
+`,
+	},
+	"map values": {
+		text:   "maps",
+		values: []interface{}{"s", map[string]string{"hello": "world"}, "i", map[int]int{1: 2, 3: 4}},
+		expectedOutput: `I output.go:<LINE>] "maps" s=map[hello:world] i=map[1:2 3:4]
+`,
+	},
+	"slice values": {
+		text:   "slices",
+		values: []interface{}{"s", []string{"hello", "world"}, "i", []int{1, 2, 3}},
+		expectedOutput: `I output.go:<LINE>] "slices" s=[hello world] i=[1 2 3]
+`,
+	},
+	"struct values": {
+		text:   "structs",
+		values: []interface{}{"s", struct{ Name, Kind, hidden string }{Name: "worker", Kind: "pod", hidden: "ignore"}},
+		expectedOutput: `I output.go:<LINE>] "structs" s={Name:worker Kind:pod hidden:ignore}
 `,
 	},
 }

test/zapr.go

@@ -237,6 +237,16 @@ I output.go:<LINE>] "odd WithValues" keyWithoutValue="(MISSING)"
 	}
  >
 `: `{"caller":"test/output.go:<LINE>","msg":"Format","v":0,"config":{"Kind":"config","RealField":42}}
+`,
+		`I output.go:<LINE>] "maps" s=map[hello:world] i=map[1:2 3:4]
+`: `{"caller":"test/output.go:<LINE>","msg":"maps","v":0,"s":{"hello":"world"},"i":{"1":2,"3":4}}
+`,
+
+		`I output.go:<LINE>] "slices" s=[hello world] i=[1 2 3]
+`: `{"caller":"test/output.go:<LINE>","msg":"slices","v":0,"s":["hello","world"],"i":[1,2,3]}
+`,
+		`I output.go:<LINE>] "structs" s={Name:worker Kind:pod hidden:ignore}
+`: `{"caller":"test/output.go:<LINE>","msg":"structs","v":0,"s":{"Name":"worker","Kind":"pod"}}
 `,
 	}
 }