Setup framework to do integration testing (#50)

compressor_integration_tests/src/map_builder.rs

@@ -0,0 +1,36 @@
+use std::collections::BTreeMap;
+
+use state_map::StateMap;
+use synapse_compress_state::StateGroupEntry;
+
+/// Generates long chain of state groups each with state deltas
+///
+/// If called wiht start=0, end=13 this would build the following:
+///
+/// 0-1-2-3-4-5-6-7-8-9-10-11-12-13
+///
+/// Where each group i has state:
+///     ('node','is',      i)
+///     ('group',  j, 'seen') - for all j less than i
+pub fn line_with_state(start: i64, end: i64) -> BTreeMap<i64, StateGroupEntry> {
+    let mut initial: BTreeMap<i64, StateGroupEntry> = BTreeMap::new();
+    let mut prev = None;
+
+    for i in start..=end {
+        let mut entry = StateGroupEntry {
+            in_range: true,
+            prev_state_group: prev,
+            state_map: StateMap::new(),
+        };
+        entry
+            .state_map
+            .insert("group", &i.to_string(), "seen".into());
+        entry.state_map.insert("node", "is", i.to_string().into());
+
+        initial.insert(i, entry);
+
+        prev = Some(i)
+    }
+
+    initial
+}