debug: Enforce programmer selection (#2394)

* debug: Enforce programmer selection

* Fixed unit tests

* Increase code coverage

Author: cmaglie

Diff for: commands/debug/debug_info.go

@@ -108,14 +108,15 @@ func getDebugProperties(req *rpc.GetDebugConfigRequest, pme *packagemanager.Expl
 		}
 	}
 
-	if req.GetProgrammer() != "" {
-		if p, ok := platformRelease.Programmers[req.GetProgrammer()]; ok {
-			toolProperties.Merge(p.Properties)
-		} else if refP, ok := referencedPlatformRelease.Programmers[req.GetProgrammer()]; ok {
-			toolProperties.Merge(refP.Properties)
-		} else {
-			return nil, &arduino.ProgrammerNotFoundError{Programmer: req.GetProgrammer()}
-		}
+	if req.GetProgrammer() == "" {
+		return nil, &arduino.MissingProgrammerError{}
+	}
+	if p, ok := platformRelease.Programmers[req.GetProgrammer()]; ok {
+		toolProperties.Merge(p.Properties)
+	} else if refP, ok := referencedPlatformRelease.Programmers[req.GetProgrammer()]; ok {
+		toolProperties.Merge(refP.Properties)
+	} else {
+		return nil, &arduino.ProgrammerNotFoundError{Programmer: req.GetProgrammer()}
 	}
 
 	var importPath *paths.Path

Diff for: commands/debug/debug_test.go

@@ -63,6 +63,21 @@ func TestGetCommandLine(t *testing.T) {
 	pm := pmb.Build()
 	pme, release := pm.NewExplorer()
 	defer release()
+
+	{
+		// Check programmer required
+		_, err := getCommandLine(req, pme)
+		require.Error(t, err)
+	}
+
+	{
+		// Check programmer not found
+		req.Programmer = "not-existent"
+		_, err := getCommandLine(req, pme)
+		require.Error(t, err)
+	}
+
+	req.Programmer = "edbg"
 	command, err := getCommandLine(req, pme)
 	require.Nil(t, err)
 	commandToTest := strings.Join(command, " ")
@@ -76,6 +91,7 @@ func TestGetCommandLine(t *testing.T) {
 		SketchPath:  sketchPath.String(),
 		Interpreter: "mi1",
 		ImportDir:   sketchPath.Join("build", "arduino-test.samd.mkr1000").String(),
+		Programmer:  "edbg",
 	}
 
 	goldCommand2 := fmt.Sprintf("%s/arduino-test/tools/arm-none-eabi-gcc/7-2017q4/bin/arm-none-eabi-gdb%s", dataDir, toolExtension) +

Diff for: commands/debug/testdata/custom_hardware/arduino-test/samd/programmers.txt

@@ -0,0 +1 @@
+edbg.name=edbg