Unit testing the automerge library and lib functions

pkg/lib/random_test.go

@@ -0,0 +1,46 @@
+package lib
+
+import (
+	"slices"
+	"testing"
+)
+
+// Test that a random subset of length 0 produces a zero length
+// list
+func TestRandomSubsetOfLength0(t *testing.T) {
+	values := []int{1, 2, 3, 4, 5, 6, 7, 8}
+	randomValues := RandomSubsetOfLength(values, 0)
+
+	if len(randomValues) != 0 {
+		t.Fatalf(`Expected length to be 0`)
+	}
+}
+
+func TestRandomSubsetOfLength1(t *testing.T) {
+	values := []int{1, 2, 3, 4, 5}
+
+	randomValues := RandomSubsetOfLength(values, 1)
+
+	if len(randomValues) != 1 {
+		t.Fatalf(`Expected length to be 1`)
+	}
+
+	if !slices.Contains(values, randomValues[0]) {
+		t.Fatalf(`Expected length to be 1`)
+	}
+}
+
+func TestRandomSubsetEntireList(t *testing.T) {
+	values := []int{1, 2, 3, 4, 5}
+	randomValues := RandomSubsetOfLength(values, len(values))
+
+	if len(randomValues) != len(values) {
+		t.Fatalf(`Expected length to be %d was %d`, len(values), len(randomValues))
+	}
+
+	slices.Sort(randomValues)
+
+	if !slices.Equal(values, randomValues) {
+		t.Fatalf(`Expected slices to be equal`)
+	}
+}