1 files changed, 31 insertions, 0 deletions
diff --git a/src/test/java/org/zwobble/couscous/tests/backends/Processes.java b/src/test/java/org/zwobble/couscous/tests/backends/Processes.java
new file mode 100644
index 0000000..63e9b35
--- /dev/null
+++ b/src/test/java/org/zwobble/couscous/tests/backends/Processes.java
@@ -0,0 +1,31 @@
+package org.zwobble.couscous.tests.backends;
+
+import com.google.common.base.Charsets;
+import com.google.common.io.CharStreams;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.nio.file.Path;
+import java.util.List;
+
+public class Processes {
+    public static String run(List<String> arguments, Path directoryPath) throws IOException, InterruptedException {
+        Process process = new ProcessBuilder(arguments.toArray(new String[arguments.size()]))
+            .directory(directoryPath.toFile())
+            .start();
+
+        int exitCode = process.waitFor();
+        String output = readString(process.getInputStream()).trim();
+        String stderrOutput = readString(process.getErrorStream());
+        if (exitCode != 0) {
+            throw new RuntimeException("stderr was: " + stderrOutput);
+        } else {
+            return output;
+        }
+    }
+
+    private static String readString(final InputStream stream) throws IOException {
+        return CharStreams.toString(new InputStreamReader(stream, Charsets.UTF_8));
+    }
+}