Fixed tests from different casing

Author: JackyChiu

manifest.go

@@ -31,7 +31,8 @@ var (
 	errInvalidPrune        = errors.Errorf("%q must be a TOML table of booleans", "prune")
 	errInvalidPruneProject = errors.Errorf("%q must be a TOML array of tables", "prune.project")
 	errInvalidMetadata     = errors.New("metadata should be a TOML table")
-	errInvalidProjectRoot  = errors.New("ProjectRoot name validation failed")
+
+	errInvalidProjectRoot = errors.New("ProjectRoot name validation failed")
 
 	errInvalidPruneValue = errors.New("prune options values must be booleans")
 	errPruneSubProject   = errors.New("prune projects should not contain sub projects")

manifest_test.go

@@ -344,11 +344,11 @@ func TestValidateManifest(t *testing.T) {
 			  nick = "foo"
 			`,
 			wantWarn: []error{
-				errors.New("Invalid key \"location\" in \"constraint\""),
-				errors.New("Invalid key \"link\" in \"constraint\""),
+				errors.New("invalid key \"location\" in \"constraint\""),
+				errors.New("invalid key \"link\" in \"constraint\""),
 				errors.New("metadata in \"constraint\" should be a TOML table"),
 				errors.New("branch, version, revision, or source should be provided for \"github.com/foo/bar\""),
-				errors.New("Invalid key \"nick\" in \"override\""),
+				errors.New("invalid key \"nick\" in \"override\""),
 				errNoName,
 			},
 			wantError: nil,