Add simple testing infrastructure

vendor/github.com/onsi/ginkgo/internal/spec/index_computer.go

@@ -0,0 +1,55 @@
+package spec
+
+func ParallelizedIndexRange(length int, parallelTotal int, parallelNode int) (startIndex int, count int) {
+	if length == 0 {
+		return 0, 0
+	}
+
+	// We have more nodes than tests. Trivial case.
+	if parallelTotal >= length {
+		if parallelNode > length {
+			return 0, 0
+		} else {
+			return parallelNode - 1, 1
+		}
+	}
+
+	// This is the minimum amount of tests that a node will be required to run
+	minTestsPerNode := length / parallelTotal
+
+	// This is the maximum amount of tests that a node will be required to run
+	// The algorithm guarantees that this would be equal to at least the minimum amount
+	// and at most one more
+	maxTestsPerNode := minTestsPerNode
+	if length%parallelTotal != 0 {
+		maxTestsPerNode++
+	}
+
+	// Number of nodes that will have to run the maximum amount of tests per node
+	numMaxLoadNodes := length % parallelTotal
+
+	// Number of nodes that precede the current node and will have to run the maximum amount of tests per node
+	var numPrecedingMaxLoadNodes int
+	if parallelNode > numMaxLoadNodes {
+		numPrecedingMaxLoadNodes = numMaxLoadNodes
+	} else {
+		numPrecedingMaxLoadNodes = parallelNode - 1
+	}
+
+	// Number of nodes that precede the current node and will have to run the minimum amount of tests per node
+	var numPrecedingMinLoadNodes int
+	if parallelNode <= numMaxLoadNodes {
+		numPrecedingMinLoadNodes = 0
+	} else {
+		numPrecedingMinLoadNodes = parallelNode - numMaxLoadNodes - 1
+	}
+
+	// Evaluate the test start index and number of tests to run
+	startIndex = numPrecedingMaxLoadNodes*maxTestsPerNode + numPrecedingMinLoadNodes*minTestsPerNode
+	if parallelNode > numMaxLoadNodes {
+		count = minTestsPerNode
+	} else {
+		count = maxTestsPerNode
+	}
+	return
+}