add simple tests for core table functions

add simple tests for each of table functions in core

core/table_test.go

@@ -0,0 +1,82 @@
+package core
+
+import (
+	"bytes"
+	"regexp"
+	"testing"
+)
+
+func TestViewLen(t *testing.T) {
+	exp := 2
+	got := viewLen("<3")
+	if got != exp {
+		t.Fatalf("expected '%d', got '%d'", exp, got)
+	}
+}
+
+func TestMaxLen(t *testing.T) {
+	exp := 7
+	got := maxLen([]string{"go", "python", "ruby", "crystal"})
+	if got != exp {
+		t.Fatalf("expected '%d', got '%d'", exp, got)
+	}
+}
+
+func TestAlignLeft(t *testing.T) {
+	exp := Alignment(0)
+	got := AlignLeft
+	if got != exp {
+		t.Fatalf("expected '%d', got '%d'", exp, got)
+	}
+}
+
+func TestAlignCenter(t *testing.T) {
+	exp := Alignment(1)
+	got := AlignCenter
+	if got != exp {
+		t.Fatalf("expected '%d', got '%d'", exp, got)
+	}
+}
+
+func TestAlignRight(t *testing.T) {
+	exp := Alignment(2)
+	got := AlignRight
+	if got != exp {
+		t.Fatalf("expected '%d', got '%d'", exp, got)
+	}
+}
+
+func TestGetPads(t *testing.T) {
+	lPadExp := -9
+	rPadExp := -8
+	lPadGot, rPadGot := getPads("Pikachu, thunderbolt!", 3, AlignCenter)
+	if rPadGot != rPadExp {
+		t.Fatalf("expected '%d', got '%d'", rPadExp, rPadGot)
+	}
+	if lPadGot != lPadExp {
+		t.Fatalf("expected '%d', got '%d'", lPadExp, lPadGot)
+	}
+}
+
+func TestPadded(t *testing.T) {
+	exp := "<3"
+	got := padded("<3", 1, AlignLeft)
+	if got != exp {
+		t.Fatalf("expected '%s', got '%s'", exp, got)
+	}
+}
+
+func TestAsTable(t *testing.T) {
+	var b bytes.Buffer
+
+	AsTable(&b, []string{"top"}, [][]string{[]string{"bottom"}})
+
+	// look for "+-------+" table style for whichever size
+	match, err := regexp.MatchString(`\++-+\+`, b.String())
+	if err != nil {
+		t.Fatalf("unable to perform regex on table output")
+	}
+	if !match {
+		t.Fatalf("expected table in format not found")
+	}
+}