1 files changed, 99 insertions, 0 deletions
diff --git a/coords_test.go b/coords_test.go
new file mode 100644
index 0000000..8f8f865
--- /dev/null
+++ b/coords_test.go
@@ -0,0 +1,99 @@
+package coords
+
+import (
+	"testing"
+)
+
+func TestAlphaStream(t *testing.T) {
+	if colstream[26] != "AA" {
+		t.Errorf("The test expected AA, got %v.", colstream[26])
+	}
+	if len(colstream) > maxCols {
+		t.Errorf(`Number of columns in alphastream exceeds Excel maximum.
+		alphastream contains %d, maxCols is %d`, len(colstream), maxCols)
+	}
+}
+
+func TestAlphaSingle(t *testing.T) {
+	ab := alphabet()
+	if ab[0] != "A" {
+		t.Errorf("The test expected A, got %v.", ab[0])
+	}
+	if ab[1] != "B" {
+		t.Errorf("The test expected B, got %v.", ab[1])
+	}
+	if ab[25] != "Z" {
+		t.Errorf("The test expected Z, got %v.", ab[25])
+	}
+}
+
+func TestAlphas(t *testing.T) {
+	a := 2 // two alphabets long
+	ecs := cols(a)
+	cases := []struct {
+		col int
+		val string
+	}{
+		{0, "A"},
+		{25, "Z"},
+		{26, "AA"},
+		{52, "BA"},
+	}
+	for _, c := range cases {
+		// we're making sure we can pass that index
+		r := 26 * a
+		if c.col > r {
+			t.Fatalf("Cannot use %d as index to array of %d", c.col, r)
+		}
+		if got := ecs[c.col]; got != c.val {
+			t.Errorf("The test expected ecs[%d] to be %s - got %s.",
+				c.col, c.val, ecs[c.col])
+		}
+	}
+}
+
+func TestCollectLetters(t *testing.T) {
+	cases := []struct {
+		alpha string
+		index int
+	}{
+		{"XEZ", 16379},
+		{"XEY", 16378},
+		{"XEX", 16377},
+		{"A", 0},
+		{"B", 1},
+		{"C", 2},
+		{"AA", 26},
+	}
+	for _, c := range cases {
+		s, err := ColAlphaToIndex(c.alpha)
+		if err != nil {
+			t.Fatal(err)
+		}
+		if s != c.index {
+			t.Errorf("Expected %d to return %s, instead it returned %d", c.index, c.alpha, s)
+		}
+
+	}
+}
+
+func TestGetColApha(t *testing.T) {
+	cases := []struct {
+		index int
+		alpha string
+	}{
+		{0, "A"},
+		{1, "B"},
+		{2, "C"},
+		{16377, "XEX"},
+	}
+	for _, c := range cases {
+		s, err := ColIndexToAlpha(c.index)
+		if err != nil {
+			t.Fatal(err)
+		}
+		if s != c.alpha {
+			t.Errorf("Expected %s, got %s\n", c.alpha, s)
+		}
+	}
+}