Add test.

cli/contain_test.go

@@ -0,0 +1,32 @@
+package main
+
+import "testing"
+
+func TestContains(t *testing.T) {
+	data := "nil"
+	sData := []string{
+		"no",
+		"nil",
+	}
+	badData := 0
+	result := contains(data, "true")
+	if result != false {
+		t.Fatalf("Failed - no contain but true.")
+	}
+	result = contains(data, "nil")
+	if result != true {
+		t.Fatalf("Failed - contain but false.")
+	}
+	result = contains(sData, "true")
+	if result != false {
+		t.Fatalf("Failed - no contain but true. (slice)")
+	}
+	result = contains(sData, "nil")
+	if result != true {
+		t.Fatalf("Failed - contain but false. (slice)")
+	}
+	result = contains(badData, "hoge")
+	if result != false {
+		t.Fatalf("Failed - input bad data but true. (slice)")
+	}
+}