From 2dc4af00c32aac9dd51fc95380ce7b6b68af8aca Mon Sep 17 00:00:00 2001
From: Adrian Gallagher <thrasher@addictionsoftware.com>
Date: Tue, 6 Feb 2018 15:41:51 +1100
Subject: [PATCH] Add CopyPairFormat to pair package and expand test coverage

---
 currency/pair/pair.go      | 10 ++++++++++
 currency/pair/pair_test.go | 27 +++++++++++++++++++++++++++
 2 files changed, 37 insertions(+)

diff --git a/currency/pair/pair.go b/currency/pair/pair.go
index f757577e..9148a442 100644
--- a/currency/pair/pair.go
+++ b/currency/pair/pair.go
@@ -149,3 +149,13 @@ func FormatPairs(pairs []string, delimiter, index string) []CurrencyPair {
 	}
 	return result
 }
+
+// CopyPairFormat copies the pair format from a list of pairs once matched
+func CopyPairFormat(p CurrencyPair, pairs []CurrencyPair) CurrencyPair {
+	for x := range pairs {
+		if p.Equal(pairs[x]) {
+			return pairs[x]
+		}
+	}
+	return CurrencyPair{}
+}
diff --git a/currency/pair/pair_test.go b/currency/pair/pair_test.go
index 1785d0c0..f568c125 100644
--- a/currency/pair/pair_test.go
+++ b/currency/pair/pair_test.go
@@ -253,6 +253,10 @@ func TestContains(t *testing.T) {
 }
 
 func TestFormatPairs(t *testing.T) {
+	if len(FormatPairs([]string{""}, "-", "")) > 0 {
+		t.Error("Test failed. TestFormatPairs: Empty string returned a valid pair")
+	}
+
 	if FormatPairs([]string{"BTC-USD"}, "-", "")[0].Pair().String() != "BTC-USD" {
 		t.Error("Test failed. TestFormatPairs: Expected pair was not found")
 	}
@@ -265,3 +269,26 @@ func TestFormatPairs(t *testing.T) {
 		t.Error("Test failed. TestFormatPairs: Expected pair was not found")
 	}
 }
+
+func TestCopyPairFormat(t *testing.T) {
+	pairOne := NewCurrencyPair("BTC", "USD")
+	pairOne.Delimiter = "-"
+	pairTwo := NewCurrencyPair("LTC", "USD")
+
+	var pairs []CurrencyPair
+	pairs = append(pairs, pairOne)
+	pairs = append(pairs, pairTwo)
+
+	testPair := NewCurrencyPair("BTC", "USD")
+	testPair.Delimiter = "~"
+
+	result := CopyPairFormat(testPair, pairs)
+	if result.Pair().String() != "BTC-USD" {
+		t.Error("Test failed. TestCopyPairFormat: Expected pair was not found")
+	}
+
+	result = CopyPairFormat(NewCurrencyPair("ETH", "USD"), pairs)
+	if result.Pair().String() != "" {
+		t.Error("Test failed. TestCopyPairFormat: Unexpected non empty pair returned")
+	}
+}