add more precise test for memory spec on linux

spec/linux/memory_test.go

@@ -3,6 +3,8 @@
 package linux
 
 import (
+	"reflect"
+	"strings"
 	"testing"
 )
 
@@ -21,7 +23,7 @@ func TestMemoryGenerator(t *testing.T) {
 		t.Errorf("should not raise error: %v", err)
 	}
 
-	memory, typeOk := value.(map[string]interface{})
+	memory, typeOk := value.(map[string]string)
 	if !typeOk {
 		t.Errorf("value should be map. %+v", value)
 	}
@@ -59,3 +61,84 @@ func TestMemoryGenerator(t *testing.T) {
 		}
 	}
 }
+
+func TestGenerateMemorySpec(t *testing.T) {
+	got, err := generateMemorySpec(strings.NewReader(
+		`MemTotal:       15434208 kB
+MemFree:         3009856 kB
+MemAvailable:   10008916 kB
+Buffers:          443104 kB
+Cached:          6305168 kB
+SwapCached:            0 kB
+Active:          7662608 kB
+Inactive:        3375044 kB
+Active(anon):    4474764 kB
+Inactive(anon):   276180 kB
+Active(file):    3187844 kB
+Inactive(file):  3098864 kB
+Unevictable:           0 kB
+Mlocked:               0 kB
+SwapTotal:             0 kB
+SwapFree:              0 kB
+Dirty:               516 kB
+Writeback:             0 kB
+AnonPages:       4289480 kB
+Mapped:           258168 kB
+Shmem:            461560 kB
+Slab:            1169796 kB
+SReclaimable:     965756 kB
+SUnreclaim:       204040 kB
+KernelStack:       42688 kB
+PageTables:        61024 kB
+NFS_Unstable:          0 kB
+Bounce:                0 kB
+WritebackTmp:          0 kB
+CommitLimit:     7717104 kB
+Committed_AS:   23796544 kB
+VmallocTotal:   34359738367 kB
+VmallocUsed:       42608 kB
+VmallocChunk:   34359578580 kB
+HardwareCorrupted:     0 kB
+AnonHugePages:         0 kB
+HugePages_Total:       0
+HugePages_Free:        0
+HugePages_Rsvd:        0
+HugePages_Surp:        0
+Hugepagesize:       2048 kB
+DirectMap4k:       65536 kB
+DirectMap2M:     3211264 kB
+DirectMap1G:    12582912 kB
+`))
+	if err != nil {
+		t.Errorf("should not raise error: %v", err)
+	}
+	expected := map[string]string{
+		"total":            "15434208kB",
+		"free":             "3009856kB",
+		"buffers":          "443104kB",
+		"cached":           "6305168kB",
+		"active":           "7662608kB",
+		"inactive":         "3375044kB",
+		"dirty":            "516kB",
+		"writeback":        "0kB",
+		"anon_pages":       "4289480kB",
+		"mapped":           "258168kB",
+		"slab":             "1169796kB",
+		"slab_reclaimable": "965756kB",
+		"slab_unreclaim":   "204040kB",
+		"page_tables":      "61024kB",
+		"nfs_unstable":     "0kB",
+		"bounce":           "0kB",
+		"commit_limit":     "7717104kB",
+		"committed_as":     "23796544kB",
+		"vmalloc_total":    "34359738367kB",
+		"vmalloc_used":     "42608kB",
+		"vmalloc_chunk":    "34359578580kB",
+		"swap_cached":      "0kB",
+		"swap_total":       "0kB",
+		"swap_free":        "0kB",
+	}
+	if !reflect.DeepEqual(got, expected) {
+		t.Errorf("invalid memory stat: %+v (expected: %+v)", got, expected)
+	}
+}