updated unit tests to conform with helm best practices

Signed-off-by: Matthew Luckam <Matthew.Luckam@peraton.com>

pkg/lint/rules/values_test.go

@@ -104,7 +104,7 @@ func TestValidateValuesFileSchemaFailure(t *testing.T) {
 }
 
 func TestValidateValuesFileSchemaOverrides(t *testing.T) {
-	yaml := "username: admin\npassword:"
+	yaml := "username: admin"
 	overrides := map[string]interface{}{
 		"password": "swordfish",
 	}
@@ -118,21 +118,51 @@ func TestValidateValuesFileSchemaOverrides(t *testing.T) {
 	}
 }
 
-func TestValidateValuesFileSchemaOverridesFailure(t *testing.T) {
-	yaml := "username: admin\npassword:"
-	overrides := map[string]interface{}{
-		"username": "anotherUser",
+func TestValidateValuesFile(t *testing.T) {
+	tests := []struct {
+		name         string
+		yaml         string
+		overrides    map[string]interface{}
+		errorMessage string
+	}{
+		{
+			name:      "value added",
+			yaml:      "username: admin",
+			overrides: map[string]interface{}{"password": "swordfish"},
+		},
+		{
+			name:         "value not overridden",
+			yaml:         "username: admin\npassword:",
+			overrides:    map[string]interface{}{"username": "anotherUser"},
+			errorMessage: "Expected: string, given: null",
+		},
+		{
+			name:      "value overridden",
+			yaml:      "username: admin\npassword:",
+			overrides: map[string]interface{}{"username": "anotherUser", "password": "swordfish"},
+		},
 	}
-	tmpdir := ensure.TempFile(t, "values.yaml", []byte(yaml))
-	defer os.RemoveAll(tmpdir)
-	createTestingSchema(t, tmpdir)
 
-	valfile := filepath.Join(tmpdir, "values.yaml")
-	err := validateValuesFile(valfile, overrides)
-	if err == nil {
-		t.Fatalf("expected values file to fail parsing")
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			tmpdir := ensure.TempFile(t, "values.yaml", []byte(tt.yaml))
+			defer os.RemoveAll(tmpdir)
+			createTestingSchema(t, tmpdir)
+
+			valfile := filepath.Join(tmpdir, "values.yaml")
+
+			err := validateValuesFile(valfile, tt.overrides)
+
+			switch {
+			case err != nil && tt.errorMessage == "":
+				t.Errorf("Failed validation with %s", err)
+			case err == nil && tt.errorMessage != "":
+				t.Error("expected values file to fail parsing")
+			case err != nil && tt.errorMessage != "":
+				assert.Contains(t, err.Error(), tt.errorMessage, "Failed with unexpected error")
+			}
+		})
 	}
-	assert.Contains(t, err.Error(), "Expected: string, given: null", "Null value for password should be caught by schema")
 }
 
 func createTestingSchema(t *testing.T, dir string) string {