feat: Add script.sh with tests

tests/files/bad_syntax.plan

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+sources= ('file:/home/user')
+targets=('file:/var/backup')

tests/files/empty_sources.plan

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+sources=()
+targets=('file:/var/backup')

tests/files/empty_targets.plan

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+sources=('file:/home/user')
+targets=()

tests/files/no_file_target.plan

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+sources=(file:///)
+targets=(ftp://user:pass@host/path)

tests/files/unsupported_source_scheme.plan

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+sources=('mongo:/user:password@localhost/database')
+targets=('file:/var/backup')

tests/files/unsupported_target_scheme.plan

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+sources=('file:/home/user')
+targets=(scp://user:pass@host/path)

tests/source_script.bats

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+#! /usr/bin/env bats
+
+# source_script() from lib/script.sh tests.
+# See: https://bats-core.readthedocs.io/en/latest/index.html
+
+setup() {
+    # Bats setup
+    load 'helpers/bats-support/load'
+    load 'helpers/bats-assert/load'
+    DIR="$( cd "$( dirname "$BATS_TEST_FILENAME" )" >/dev/null 2>&1 && pwd )"
+    PATH="$DIR/../src/lib:$PATH"
+}
+
+# ------------------------------ #
+# Do tests!                      #
+# ------------------------------ #
+
+@test "Bad script syntax" {
+    . script.sh
+    run source_script $DIR/files/bad_syntax.plan
+    assert_output --partial 'Error: Please check your syntax'
+}
+
+@test "Empty script" {
+    . script.sh
+    run source_script $DIR/files/empty_script.plan
+    assert_output --partial 'Error: sources array is not set'
+}
+
+@test "Empty sources array" {
+    . script.sh
+    run source_script $DIR/files/empty_sources.plan
+    assert_output --partial 'Error: sources array is not set'
+}
+
+@test "Empty targets array" {
+    . script.sh
+    run source_script $DIR/files/empty_targets.plan
+    assert_output --partial 'Error: targets array is not set'
+}
+
+@test "No targets with file URI scheme" {
+    . script.sh
+    run source_script $DIR/files/no_file_target.plan
+    assert_output --partial "Error: 'file' scheme is not set in targets. You must provide one or more targets with 'file' scheme."
+}
+
+@test "Unsuported source scheme" {
+    . script.sh
+    run source_script $DIR/files/unsupported_source_scheme.plan
+    assert_output --partial 'Error: Unsupported URI scheme: mongo'
+}
+
+@test "Unsuported target scheme" {
+    . script.sh
+    run source_script $DIR/files/unsupported_target_scheme.plan
+    assert_output --partial 'Error: Unsupported URI scheme: scp'
+}