Add tests for `--squeeze`

tests/examples/empty_lines.txt

@@ -0,0 +1,30 @@
+line 1
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+
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+line 5
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+
+
+
+
+
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+
+
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+line 20
+line 21
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+line 24
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+line 26
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+line 30

tests/integration_tests.rs

@@ -208,6 +208,70 @@ fn line_range_multiple() {
         .stdout("line 1\nline 2\nline 4\n");
 }
 
+#[test]
+fn squeeze() {
+    bat()
+        .arg("empty_lines.txt")
+        .arg("--squeeze")
+        .assert()
+        .success()
+        .stdout("line 1\n\nline 5\n\nline 20\nline 21\n\nline 24\n\nline 26\n\nline 30\n");
+}
+
+#[test]
+fn squeeze_line_numbers() {
+    bat()
+        .arg("empty_lines.txt")
+        .arg("--squeeze")
+        .arg("--decorations=always")
+        .arg("--number")
+        .assert()
+        .success()
+        .stdout("   1 line 1\n   2 \n   5 line 5\n   6 \n  20 line 20\n  21 line 21\n  22 \n  24 line 24\n  25 \n  26 line 26\n  27 \n  30 line 30\n");
+}
+
+#[test]
+fn squeeze_limit() {
+    bat()
+        .arg("empty_lines.txt")
+        .arg("--squeeze")
+        .arg("--squeeze-limit=2")
+        .assert()
+        .success()
+        .stdout("line 1\n\n\nline 5\n\n\nline 20\nline 21\n\n\nline 24\n\nline 26\n\n\nline 30\n");
+
+    bat()
+        .arg("empty_lines.txt")
+        .arg("--squeeze")
+        .arg("--squeeze-limit=5")
+        .assert()
+        .success()
+        .stdout("line 1\n\n\n\nline 5\n\n\n\n\n\nline 20\nline 21\n\n\nline 24\n\nline 26\n\n\n\nline 30\n");
+}
+
+#[test]
+fn squeeze_limit_line_numbers() {
+    bat()
+        .arg("empty_lines.txt")
+        .arg("--squeeze")
+        .arg("--squeeze-limit=2")
+        .arg("--decorations=always")
+        .arg("--number")
+        .assert()
+        .success()
+        .stdout("   1 line 1\n   2 \n   3 \n   5 line 5\n   6 \n   7 \n  20 line 20\n  21 line 21\n  22 \n  23 \n  24 line 24\n  25 \n  26 line 26\n  27 \n  28 \n  30 line 30\n");
+
+    bat()
+        .arg("empty_lines.txt")
+        .arg("--squeeze")
+        .arg("--squeeze-limit=5")
+        .arg("--decorations=always")
+        .arg("--number")
+        .assert()
+        .success()
+        .stdout("   1 line 1\n   2 \n   3 \n   4 \n   5 line 5\n   6 \n   7 \n   8 \n   9 \n  10 \n  20 line 20\n  21 line 21\n  22 \n  23 \n  24 line 24\n  25 \n  26 line 26\n  27 \n  28 \n  29 \n  30 line 30\n");
+}
+
 #[test]
 #[cfg_attr(any(not(feature = "git"), target_os = "windows"), ignore)]
 fn short_help() {