Updated changelog for #542 and caught one more place to check

CHANGELOG.md

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4799070..6b80ea1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -15,6 +15,7 @@
   others are deprecated and no longer needed.
 
 ## Fixed
+- #542: Glide failed to detect some test dependencies (thanks @sdboyer)
 - #517: Fixed failure to install testImport from lock when no imports present
   or when same dependency on both import and testImport
 - #440: Fixed panic in `glide tree` when walking the filesystem (thanks @abhin4v)

dependency/scan.go

diff --git a/dependency/scan.go b/dependency/scan.go
index 71f4865..a8794d1 100644
--- a/dependency/scan.go
+++ b/dependency/scan.go
@@ -137,6 +137,18 @@
 				testPkgs = append(testPkgs, dep)
 			}
 		}
+
+		for _, dep := range pk.XTestImports {
+			found := false
+			for _, p := range pkgs {
+				if p == dep {
+					found = true
+				}
+			}
+			if !found {
+				testPkgs = append(testPkgs, dep)
+			}
+		}
 	}
 
 	return pkgs, testPkgs, nil