diff --git a/Makefile b/Makefile
index 758a093..c8d31d7 100644
--- a/Makefile
+++ b/Makefile
@@ -8,7 +8,7 @@ MAPPER_GEN_FILE := ./api/eiaapi_funcmap.gen.go
 GO_FORMATTER := gofumpt
 
 IS_GNU_SED := $(shell sed --version >/dev/null 2>&1 && echo true || echo false)
-SED_INLINE := $(if $(IS_GNU_SED),-i,-i '')
+SED_INLINE := $(if $(filter true,$(IS_GNU_SED)),-i,-i '')
 
 .PHONY: all schema generate test build install clean
 
diff --git a/pkg/eia/eia_reflection_test.go b/pkg/eia/eia_reflection_test.go
index 965180e..13ee565 100644
--- a/pkg/eia/eia_reflection_test.go
+++ b/pkg/eia/eia_reflection_test.go
@@ -90,6 +90,19 @@ func Test_prepMethodArgs(t *testing.T) {
 }
 
 func Test_getRR(t *testing.T) {
+	sampleFinalRouteResponse := eiaapi.FinalRouteResponse{
+		Request: &eiaapi.RouteRequest{},
+		Response: &eiaapi.FinalRoute{
+			Description: ptr.To("Annual Energy Outlook"),
+			Id:          ptr.To("aeo"),
+			Facets: &[]eiaapi.FacetMetaData{
+				{
+					Description: ptr.To("Future Scenario"),
+					Id:          ptr.To("scenario"),
+				},
+			},
+		},
+	}
 	sampleRouteResponse := eiaapi.RouteResponse{
 		Request: &eiaapi.RouteRequest{},
 		Response: &eiaapi.Routes{
@@ -112,6 +125,7 @@ func Test_getRR(t *testing.T) {
 		args    args
 		want    eiaapi.RouteResponse
 		wantErr bool
+		wantNil bool
 	}{
 		{
 			name: "Extract routes response",
@@ -121,6 +135,15 @@ func Test_getRR(t *testing.T) {
 			want:    sampleRouteResponse,
 			wantErr: false,
 		},
+		{
+			name: "Unexpected final route",
+			args: args{
+				json200: reflect.ValueOf(&sampleFinalRouteResponse),
+			},
+			want:    eiaapi.RouteResponse{},
+			wantNil: true,
+			wantErr: true,
+		},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
@@ -128,6 +151,11 @@ func Test_getRR(t *testing.T) {
 			if (err != nil) != tt.wantErr {
 				t.Errorf("getRR() error = %v, wantErr %v", err, tt.wantErr)
 				return
+			} else if (got == nil) != tt.wantNil {
+				t.Error("unexpected nil response")
+				return
+			} else if (got == nil) == tt.wantNil {
+				return
 			}
 			if !reflect.DeepEqual(*got, tt.want) {
 				t.Errorf("getRR() = %v, want %v", got, tt.want)
@@ -135,3 +163,40 @@ func Test_getRR(t *testing.T) {
 		})
 	}
 }
+
+func Test_getParser(t *testing.T) {
+	type args struct {
+		forMethod string
+	}
+	tests := []struct {
+		name    string
+		args    args
+		want    reflect.Value
+		wantErr bool
+	}{
+		{
+			name:    "Get known parser",
+			args:    args{forMethod: "GetV2Aeo"},
+			want:    reflect.ValueOf(eiaapi.ParseFunctionsMap["ParseGetV2AeoResponse"]),
+			wantErr: false,
+		},
+		{
+			name:    "Get unknown parser",
+			args:    args{forMethod: "GetNonsense"},
+			want:    reflect.ValueOf(nil),
+			wantErr: true,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got, err := getParser(tt.args.forMethod)
+			if (err != nil) != tt.wantErr {
+				t.Errorf("getParser() error = %v, wantErr %v", err, tt.wantErr)
+				return
+			}
+			if !reflect.DeepEqual(got, tt.want) {
+				t.Errorf("getParser() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}