test(cmd): add pattern for testing cmd package

cmd/helm/list_test.go

+package main
+
+import (
+	"bytes"
+	"testing"
+
+	"k8s.io/helm/pkg/helm"
+)
+
+// Stubbed out tests at two diffent layers
+// TestList() is testing the command action
+// TestListCmd() is testing command line interface
+
+// TODO mock tiller responses
+
+func TestList(t *testing.T) {
+	helm.Config.ServAddr = ":44134"
+
+	tests := []struct {
+		name     string
+		lister   *lister
+		expected string
+		err      bool
+	}{
+		{
+			name:     "with a release",
+			lister:   &lister{},
+			expected: "understood-coral",
+		},
+		{
+			name:     "list --long",
+			lister:   &lister{long: true},
+			expected: "NAME            \tUPDATED                 \tSTATUS  \tCHART      \nunderstood-coral\tTue Jun 28 12:29:54 2016\tDEPLOYED\tnginx-0.1.0",
+		},
+	}
+
+	var buf bytes.Buffer
+	for _, tt := range tests {
+		tt.lister.out = &buf
+		err := tt.lister.run([]string{})
+		if (err != nil) != tt.err {
+			t.Errorf("%q. expected error: %v, got %v", tt.name, tt.err, err)
+		}
+		actual := string(bytes.TrimSpace(buf.Bytes()))
+		if actual != tt.expected {
+			t.Errorf("%q. expected %q, got %q", tt.name, tt.expected, actual)
+		}
+		buf.Reset()
+	}
+}
+
+func TestListCmd(t *testing.T) {
+	helm.Config.ServAddr = ":44134"
+
+	tests := []struct {
+		name     string
+		args     []string
+		flags    map[string]string
+		expected string
+		err      bool
+	}{
+		{
+			name:     "with a release",
+			expected: "understood-coral",
+		},
+		{
+			name:     "list --long",
+			flags:    map[string]string{"long": "1"},
+			expected: "NAME            \tUPDATED                 \tSTATUS  \tCHART      \nunderstood-coral\tTue Jun 28 12:29:54 2016\tDEPLOYED\tnginx-0.1.0",
+		},
+	}
+
+	var buf bytes.Buffer
+	for _, tt := range tests {
+		cmd := newListCmd(&buf)
+		for flag, value := range tt.flags {
+			cmd.Flags().Set(flag, value)
+		}
+		err := cmd.RunE(cmd, tt.args)
+		if (err != nil) != tt.err {
+			t.Errorf("%q. expected error: %v, got %v", tt.name, tt.err, err)
+		}
+		actual := string(bytes.TrimSpace(buf.Bytes()))
+		if actual != tt.expected {
+			t.Errorf("%q. expected %q, got %q", tt.name, tt.expected, actual)
+		}
+		buf.Reset()
+	}
+}