diff --git a/internal/datasources/structured/decoders_test.go b/internal/datasources/structured/decoders_test.go
new file mode 100644
index 0000000000..99da3f4ce8
--- /dev/null
+++ b/internal/datasources/structured/decoders_test.go
@@ -0,0 +1,110 @@
+// SPDX-FileCopyrightText: Copyright 2024 The Minder Authors
+// SPDX-License-Identifier: Apache-2.0
+
+package structured
+
+import (
+	"bytes"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestJsonDecoder(t *testing.T) {
+	t.Parallel()
+	for _, tc := range []struct {
+		name    string
+		data    []byte
+		mustErr bool
+		expect  any
+	}{
+		{name: "normal", data: []byte(`{"a":1, "b":"abc"}`), mustErr: false},
+		{name: "invalid_json", data: []byte(`a 1`), mustErr: true},
+	} {
+		t.Run(tc.name, func(t *testing.T) {
+			t.Parallel()
+			var b bytes.Buffer
+			_, err := b.Write(tc.data)
+			require.NoError(t, err)
+
+			dec := jsonDecoder{}
+			res, err := dec.Parse(&b)
+			if tc.mustErr {
+				require.Error(t, err)
+				return
+			}
+			require.NoError(t, err)
+			require.NotNil(t, res)
+		})
+		dec := jsonDecoder{}
+		_, err := dec.Parse(nil)
+		require.Error(t, err)
+
+	}
+}
+
+func TestYamlDecoder(t *testing.T) {
+	t.Parallel()
+	for _, tc := range []struct {
+		name    string
+		data    []byte
+		mustErr bool
+		expect  any
+	}{
+		{name: "normal", data: []byte("---\na: 1\nb:\n  - \"Hey\"\n  - \"Bye\"\n"), mustErr: false},
+		{name: "invalid_yaml", data: []byte("  a 1\na: 2\n"), mustErr: true},
+	} {
+		t.Run(tc.name, func(t *testing.T) {
+			t.Parallel()
+			var b bytes.Buffer
+			_, err := b.Write(tc.data)
+			require.NoError(t, err)
+
+			dec := yamlDecoder{}
+			res, err := dec.Parse(&b)
+			if tc.mustErr {
+				require.Error(t, err)
+				return
+			}
+			require.NoError(t, err)
+			require.NotNil(t, res)
+		})
+		dec := yamlDecoder{}
+		_, err := dec.Parse(nil)
+		require.Error(t, err)
+
+	}
+}
+
+func TestTomlDecoder(t *testing.T) {
+	t.Parallel()
+	for _, tc := range []struct {
+		name    string
+		data    []byte
+		mustErr bool
+		expect  any
+	}{
+		{name: "normal", data: []byte("title = \"TOML Example\"\n\n[owner]\nname = \"Tom Preston-Werner\""), mustErr: false},
+		{name: "invalid_toml", data: []byte("  a 1\na: 2\n"), mustErr: true},
+	} {
+		t.Run(tc.name, func(t *testing.T) {
+			t.Parallel()
+			var b bytes.Buffer
+			_, err := b.Write(tc.data)
+			require.NoError(t, err)
+
+			dec := tomlDecoder{}
+			res, err := dec.Parse(&b)
+			if tc.mustErr {
+				require.Error(t, err)
+				return
+			}
+			require.NoError(t, err)
+			require.NotNil(t, res)
+		})
+		dec := tomlDecoder{}
+		_, err := dec.Parse(nil)
+		require.Error(t, err)
+
+	}
+}
diff --git a/internal/datasources/structured/handler_test.go b/internal/datasources/structured/handler_test.go
new file mode 100644
index 0000000000..c20f4e1765
--- /dev/null
+++ b/internal/datasources/structured/handler_test.go
@@ -0,0 +1,230 @@
+// SPDX-FileCopyrightText: Copyright 2024 The Minder Authors
+// SPDX-License-Identifier: Apache-2.0
+
+package structured
+
+import (
+	"context"
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/go-git/go-billy/v5"
+	"github.com/go-git/go-billy/v5/memfs"
+	"github.com/stretchr/testify/require"
+
+	minderv1 "github.com/mindersec/minder/pkg/api/protobuf/go/minder/v1"
+	v1datasources "github.com/mindersec/minder/pkg/datasources/v1"
+	"github.com/mindersec/minder/pkg/engine/v1/interfaces"
+)
+
+func writeFSFile(t *testing.T, fs billy.Filesystem, path string, data []byte) {
+	t.Helper()
+	require.NoError(t, fs.MkdirAll(filepath.Dir(path), os.FileMode(0o755)))
+	f, err := fs.Create(path)
+	require.NoError(t, err)
+	_, err = f.Write(data)
+	require.NoError(t, err)
+	require.NoError(t, f.Close())
+}
+
+func TestOpenFirstAlternative(t *testing.T) {
+	t.Parallel()
+
+	genFS := func(t *testing.T) billy.Filesystem {
+		t.Helper()
+		fs := memfs.New()
+		writeFSFile(t, fs, "./test1.json", []byte("hello"))
+		writeFSFile(t, fs, "/dir/test2.json", []byte("hello"))
+		writeFSFile(t, fs, "dir2/test3.json", []byte("hello"))
+		return fs
+	}
+	for _, tc := range []struct {
+		name         string
+		createFS     func(t *testing.T) billy.Filesystem
+		mainPath     string
+		alternatives []string
+		expectedFile string
+		mustErr      bool
+	}{
+		{
+			name:         "mainpath",
+			createFS:     genFS,
+			mainPath:     "./test1.json",
+			alternatives: []string{"dir/test2.json", "dir2/test.json"},
+			expectedFile: "test1.json",
+			mustErr:      false,
+		},
+		{
+			name: "dir-must-be-ignored",
+			createFS: func(t *testing.T) billy.Filesystem {
+				t.Helper()
+				fs := memfs.New()
+				writeFSFile(t, fs, "./file.json", []byte("hello"))
+				require.NoError(t, fs.MkdirAll("./dir", os.FileMode(0o755)))
+				return fs
+			},
+			mainPath:     "./dir",
+			alternatives: []string{"file.json"},
+			expectedFile: "file.json",
+			mustErr:      false,
+		},
+		{
+			name:         "first-alternative",
+			createFS:     genFS,
+			mainPath:     "./non-existent",
+			alternatives: []string{"dir/test2.json", "dir2/test.json"},
+			expectedFile: "dir/test2.json",
+			mustErr:      false,
+		},
+		{
+			name:         "second-alternative",
+			createFS:     genFS,
+			mainPath:     "./non-existent2",
+			alternatives: []string{"./non-existent", "dir2/test3.json"},
+			expectedFile: "dir2/test3.json",
+			mustErr:      false,
+		},
+		{
+			name:         "no-main",
+			createFS:     genFS,
+			mainPath:     "",
+			alternatives: []string{"dir2/test3.json"},
+			expectedFile: "dir2/test3.json",
+			mustErr:      false,
+		},
+		{
+			name:         "no-valid-files",
+			createFS:     genFS,
+			mainPath:     "non-existing",
+			alternatives: []string{"also-non-existing.txt"},
+			expectedFile: "",
+			mustErr:      true,
+		},
+		{
+			name:         "no-inputs",
+			createFS:     genFS,
+			mainPath:     "",
+			alternatives: []string{},
+			expectedFile: "",
+			mustErr:      true,
+		},
+	} {
+		t.Run(tc.name, func(t *testing.T) {
+			t.Parallel()
+			fs := tc.createFS(t)
+			f, err := openFirstAlternative(fs, tc.mainPath, tc.alternatives)
+			if tc.mustErr {
+				require.Error(t, err)
+				return
+			}
+			require.NoError(t, err)
+			require.Equal(t, tc.expectedFile, f.Name())
+		})
+	}
+}
+
+func TestParseFileAlternatives(t *testing.T) {
+	t.Parallel()
+	for _, tc := range []struct {
+		name    string
+		main    string
+		mustErr bool
+	}{
+		{"fn-success", "test1.json", false},
+		{"fn-fails", "", true},
+	} {
+		t.Run(tc.name, func(t *testing.T) {
+			t.Parallel()
+			fs := memfs.New()
+			writeFSFile(t, fs, "./test1.json", []byte("{ \"a\": \"b\"}"))
+			res, err := parseFileAlternatives(fs, tc.main, []string{})
+			if tc.mustErr {
+				require.Error(t, err)
+				return
+			}
+			require.NoError(t, err)
+			require.NotNil(t, res)
+		})
+	}
+}
+
+func TestNew(t *testing.T) {
+	t.Parallel()
+	h, err := newHandlerFromDef(&minderv1.StructDataSource_Def{
+		Path: &minderv1.StructDataSource_Def_Path{
+			FileName: "test.txt",
+		},
+	})
+	require.NoError(t, err)
+	require.NotNil(t, h)
+
+	_, err = newHandlerFromDef(nil)
+	require.Error(t, err)
+}
+
+func TestCall(t *testing.T) {
+	t.Parallel()
+	for _, tc := range []struct {
+		name         string
+		buildContext func(t *testing.T) context.Context
+		def          *minderv1.StructDataSource_Def
+		mustErr      bool
+	}{
+		{
+			"success",
+			func(t *testing.T) context.Context {
+				t.Helper()
+				fs := memfs.New()
+				writeFSFile(t, fs, "./test1.json", []byte("{ \"a\": \"b\"}"))
+
+				return context.WithValue(
+					context.Background(),
+					v1datasources.ContextKey{},
+					v1datasources.Context{
+						Ingest: &interfaces.Result{Fs: fs},
+					},
+				)
+			},
+			&minderv1.StructDataSource_Def{
+				Path: &minderv1.StructDataSource_Def_Path{
+					FileName: "test1.json",
+				},
+			},
+			false,
+		},
+		{
+			"no-datasource-context",
+			func(t *testing.T) context.Context {
+				t.Helper()
+				return context.Background()
+			},
+			&minderv1.StructDataSource_Def{},
+			true,
+		},
+		{"ctx-no-fs",
+			func(t *testing.T) context.Context {
+				t.Helper()
+				return context.WithValue(
+					context.Background(),
+					v1datasources.ContextKey{},
+					v1datasources.Context{},
+				)
+			},
+			&minderv1.StructDataSource_Def{},
+			true},
+	} {
+		t.Run(tc.name, func(t *testing.T) {
+			t.Parallel()
+			ctx := tc.buildContext(t)
+			handler, err := newHandlerFromDef(tc.def)
+			require.NoError(t, err)
+			_, err = handler.Call(ctx, []string{})
+			if tc.mustErr {
+				require.Error(t, err)
+				return
+			}
+			require.NoError(t, err)
+		})
+	}
+}
diff --git a/internal/datasources/structured/structured_test.go b/internal/datasources/structured/structured_test.go
new file mode 100644
index 0000000000..c1f06e5144
--- /dev/null
+++ b/internal/datasources/structured/structured_test.go
@@ -0,0 +1,44 @@
+// SPDX-FileCopyrightText: Copyright 2024 The Minder Authors
+// SPDX-License-Identifier: Apache-2.0
+
+package structured
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+
+	minderv1 "github.com/mindersec/minder/pkg/api/protobuf/go/minder/v1"
+)
+
+func TestNewStructDataSource(t *testing.T) {
+	t.Parallel()
+	for _, tc := range []struct {
+		name    string
+		sds     *minderv1.StructDataSource
+		mustErr bool
+	}{
+		{"nil-def", nil, true},
+		{"no-def", &minderv1.StructDataSource{}, true},
+		{"invalid-def", &minderv1.StructDataSource{
+			Def: map[string]*minderv1.StructDataSource_Def{"test": nil},
+		}, true},
+		{"success", &minderv1.StructDataSource{
+			Def: map[string]*minderv1.StructDataSource_Def{
+				"test": {
+					Path: &minderv1.StructDataSource_Def_Path{FileName: "test.yaml"},
+				},
+			},
+		}, false},
+	} {
+		t.Run(tc.name, func(t *testing.T) {
+			t.Parallel()
+			_, err := NewStructDataSource(tc.sds)
+			if tc.mustErr {
+				require.Error(t, err)
+				return
+			}
+			require.NoError(t, err)
+		})
+	}
+}