adapted version generation to cfg module, added and fixed unit tests

cfg/config_test.go

@@ -17,4 +17,82 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
 
 package cfg
 
-// FIXME: add tests
+import (
+	"fmt"
+	//	"reflect"
+	"testing"
+)
+
+func TestPrepareModeFlags(t *testing.T) {
+	var tests = []struct {
+		flag   Modeflag
+		mode   string // input, if any
+		expect string // output
+		want   bool
+	}{
+		// short commandline flags like -M
+		{Modeflag{X: true}, "", "extended", false},
+		{Modeflag{S: true}, "", "shell", false},
+		{Modeflag{O: true}, "", "orgtbl", false},
+		{Modeflag{Y: true}, "", "yaml", false},
+		{Modeflag{M: true}, "", "markdown", false},
+		{Modeflag{}, "", "ascii", false},
+
+		// long flags like -o yaml
+		{Modeflag{}, "extended", "extended", false},
+		{Modeflag{}, "shell", "shell", false},
+		{Modeflag{}, "orgtbl", "orgtbl", false},
+		{Modeflag{}, "yaml", "yaml", false},
+		{Modeflag{}, "markdown", "markdown", false},
+
+		// failing
+		{Modeflag{}, "blah", "", true},
+	}
+
+	for _, tt := range tests {
+		testname := fmt.Sprintf("PrepareModeFlags-flags-mode-%s-expect-%s-want-%t",
+			tt.mode, tt.expect, tt.want)
+		t.Run(testname, func(t *testing.T) {
+			c := Config{OutputMode: tt.mode}
+
+			// check either flag or pre filled mode, whatever is defined in tt
+			err := c.PrepareModeFlags(tt.flag, tt.mode)
+			if err != nil {
+				if !tt.want {
+					// expect to fail
+					t.Fatalf("PrepareModeFlags returned unexpected error: %s", err)
+				}
+			} else {
+				if c.OutputMode != tt.expect {
+					t.Errorf("got: %s, expect: %s", c.OutputMode, tt.expect)
+				}
+			}
+		})
+	}
+}
+
+func TestPrepareSortFlags(t *testing.T) {
+	var tests = []struct {
+		flag   Sortmode
+		expect string // output
+	}{
+		// short commandline flags like -M
+		{Sortmode{Numeric: true}, "numeric"},
+		{Sortmode{Age: true}, "duration"},
+		{Sortmode{Time: true}, "time"},
+		{Sortmode{}, "string"},
+	}
+
+	for _, tt := range tests {
+		testname := fmt.Sprintf("PrepareSortFlags-expect-%s", tt.expect)
+		t.Run(testname, func(t *testing.T) {
+			c := Config{}
+
+			c.PrepareSortFlags(tt.flag)
+
+			if c.SortMode != tt.expect {
+				t.Errorf("got: %s, expect: %s", c.SortMode, tt.expect)
+			}
+		})
+	}
+}